Integrated Subsystems

RF modules with embedded protocol

Radiocrafts AS has introduced a series of small-form RF modules. The RC1040, RC1080 and RC1090 series of modules have a half a square inch footprint and are two-way radio solutions with an embedded protocol. The shielded modules made for surface mounting measure 12.7 mm × 25.4 mm × 3.5 mm. Data buffering, addressing and error check are all handled by the embedded RC232 protocol. A standard UART serial bus is the interface to the host.

Typical applications include home, building and industrial automation, automatic meter reading, remote control and telemetry, fleet and asset management. The modules are designed for operation in the license-free bands in Europe at 433 and 868 MHz respectively, whereas RC1090 operates under FCC regulations for use in the United States and Canada at 902-928 MHz. The modules are multichannel transceivers with up to nine channels, 10 dBm output power and -100 dBm sensitivity at 19.2 kbps.

The modules are suitable for pick and place automatic assembly for volume production and are available on tape and reel. Volume pricing (>50k) is down at USD 20.
Radiocrafts AS
(+47) 970 86 676

Design Software

Signal circuit synthesis tool

Eagleware has introduced SIGNAL CONTROL, an add-on module to Genesys. The SIGNAL CONTROL module synthesizes signal circuits that traffic the flow of power through a network. A module add-on to the Genesys version 2003.10, it is capable of laying out circuits with the input of desired characteristics such as topology and frequency range. The signal control 37 structures include couplers, splitters, combiners, baluns and attenuators.
(678) 291-0259

Models for Schottky and varactor diodes

Modelithics has introduced a complete library of non-linear diode models for Schottky and varactor diodes. The new library is the company's first library of active component models. Most of the diode models are substrate-scalable, meaning that they accurately represent the component on a wide variety of popular substrates. The diodes represent components from leading vendors including Infineon, Toshiba, On Semiconductor, and Alpha, and are compatible with Agilent's ADS. The Modelithics Diode Libraries will also be available for Applied Wave Research Microwave Office and Eagleware GENESYS in the near future.
(813) 866-6335

RLC extractor

Ansoft Corporation has released the Q3D Extractor v6, the next generation of 3D parasitic extraction technology. Q3D Extractor assists in the design of nets and interconnect components in integrated circuit (IC) packages (i.e., leads, bond wires), on printed circuit boards (PCBs) and in the connection path between them (i.e., connectors, cables, sockets, transmission lines).

The technology features the Ansoft Desktop, an intuitive, easy-to-use, design environment already familiar to HFSS v9 and Ansoft Designer customers. The new environment integrates all electromagnetic-field simulations required for the extraction of 3D RLC parameters and automatically generates equivalent circuit models.

Q3D Extractor v6 will be available for general commercial release in March 2004.
Ansoft Corporation
(412) 261-3200

Design environment

Agilent has updated the RF Design environment in release C. The updates include the following features:

RFDE 2003C-Wireless Test Benches: Wireless Test Benches can directly verify Cadence-based RF circuit schematics with various baseband architectures.

RFDE 2003C-RFDE Momentum: EM-based models generation using Momentum is integrated with RF Design Environment 2003C.

RFDE 2003C-Verilog-A Compiler: Verilog-A Compiler enables the simulation of Verilog-A models in ADS/RFDE, with simulation times comparable to built-in models.
Agilent Technologies
(800) 452 4844

Interface and Interconnects

50Ω cables

Belden Electronics Division has announced the addition of RF500 and RF600 cables to its line of RF coaxial cables. These large, low-loss, 50Ω coaxial cables are engineered for transmission quality and reliability, plus they exactly meet industry size standards with diameters of 0.500-inches (RF500) and 0.590-inches (RF600).

RF500 and RF600 coaxial cables feature copper-clad aluminum conductors, foamed high-density polyethylene (FHDPE) insulation, an aluminum foil and tinned copper braid composite shield, and a choice of either PE or PVC jacket. The cables are also 100% sweep tested for VSWR and exhibit phase stability over both temperature changes and repeated flexing conditions, resulting in signal integrity and electrical performance.

These cables are available in three versions: with weatherproof PE jackets (Product #7976A and 7977A); with PE jackets that include a water-blocking gel embedded in the shield for additional protection in wet environments (Product #7976WB and 7977WB); and with flame-retardant PVC jackets and a UL listing for interior riser applications (Product #7976R and 7977R).
Belden Electronics Division
(800) 235-3361

QMA connector

RF Connector Division of RF Industries Inc. has announced a QMA series connector designed similar to the SMA internal configuration with a snap-on interface. It needs no tooling for mating and unmating. The connector features a sliding snap-lock mechanism that works by sliding the shell back and releasing to lock both connectors in place. This can eliminate space between connectors.

After they are mated, the QMA connectors can be rotated 360 degrees. Designed to mate with all QMA jacks, they offer electrical performance up to 6 GHz.

Both the RQA-5010-C, for RG-58/U and LMR-195 cable, and the RQA-5010-X, for RG-8/X and LMR-240 cable, feature albaloy plated brass bodies, Teflon insulation, spring copper alloy outer contacts and gold plated pins.
RF Industries, Inc.

HD-ready video patch jack

Trompeter's enhanced J314 series dual patch jacks are for TV broadcast and production facilities. Available as individual units or loaded into panels, the patch jacks include the J314W and J314WT (terminated and non-terminated versions) jacks as well as a smaller J314MW and J314MWT jacks for the miniWECo plug standard.

The enhanced J314 series is designed with a forked actuator to enable multiple contact points for robust normal-through interconnection in high non-conductive particulate environments. The 75 Ω design offers extended bandwidth of 1 MHz to 3GHz with return loss performance of 20 dB at 2.2 GHz in the normal-through condition. The J314 series provides self-wiping action upon plug insertion, an approach that eliminates the need for heavy and complex dust control plungers and multiple actuators.
(800) 982-2629

SOIC adapter

Aries Electronics now offers SOIC adapters that provide an upgrade from older Aromat HB2E relays to surface-mount TXSS relays while keeping the same PBC layout.

Available on 0.300 inch (7.62 mm) DIP centers, the new adapter can be mounted on PCBs with a PCB hole diameter of 0.028 inch +/-0.003 inch (.71 mm +/-.08 mm). The adapters are available with eight leads.

The adapters are constructed of 0.062 inch (1.57 mm) thick FR-4 with 1 ounce of copper traces on both sides. The pins are 360 ½ hard brass alloy, per UNS C36000 ASTM-B16085, and pin plating is 200 µ (5.08 µm) minimum tin/lead 93/7, per MIL-P-81728 over 100 µ (2.54 µm) minimum nickel, per QQ-N-290. Operating temperature is 221°F (105°C).

Pricing for 1000 pieces is $5.40 each with delivery from stock to three weeks.
Aries Electronics
(908) 996-6841


Composite preforms

TechFilm has provided a product for electrical conductivity and electrical insulation properties in one preform. The “Composite Preform” materials are formulated to meet ASTMD 3850 as well as MIL. 883 section outgassing specifications.

TechFilm products have many uses in manufacturing including BGA packages, circuit boards, EMI shielding, enclosures, hybrid microelectronics assemblies, laminating films, semiconductor packaging and devices, smart cards, substrate attach and many other high-performance industrial products.
Techfilm Services, Inc.
(888) 832-4345

Semiconductors and ICs

Downconverter RFIC

Hittite Microwave Corporation has released a new downconverter RFIC that is designed for use in wireless infrastructure applications in the 800-1000 MHz band, including those based on GSM, CDMA, GPRS and EDGE standards.

The integrated mixer coupled with an IF amplifier, enables the HMC377QS16G to achieve an input IP3 of +15 dBm, while providing 14 dB of conversion gain and an excellent noise figure of 11 dB. An integrated LO buffer amplifier accepts a range of LO drive levels, from 0 to -10 dBm and can be driven directly from a frequency synthesizer output. The LO to IF & RF to IF isolations of 70 dB and 90 dB, respectively, may help to reduce the filtering requirements within the receiver. The mixer supports IF frequencies from 50 to 250 MHz and operates from a single +5.0 V supply.

Samples and evaluation PC boards are available from stock for sampling or sale.
Hittite Microwave Corporation
(978) 250-3343

90 W LDMOS for 860 to 960 MHz

Infineon Technologies' PTF080901E GOLDMOS is a field effect transistor for EDGE and CDMA applications in a thermally enhanced package. This 90 W, LDMOS single-ended transistor delivers 45 W average output power under EDGE conditions with 40 percent efficiency and 18 dB gain. Typical CW performance gives an impressive 120 W typical output power with 60 percent efficiency and 17 dB gain. Added to this performance is a low thermal resistance with a 0.52 °C/W. Capable of handling 10:1 VSWR at 28 V, 90 W CW, it has thermal stability and low HCI drift. The transistor uses full gold metallization and integrated ESD protection.
Infineon Technologies NA
(408) 776-0600

RF receiver IC

California Eastern Laboratories has introduced NEC's UPB1009K a single-chip double-conversion RF-to-IF I-Q frequency translator designed to provide a complete RF front end for GPS receivers. It is compatible with W-CDMA, GSM and PDC systems. An integrated solution, it combines a low-noise amplifier, VCO, PLL, IF AGC amplifiers, IF filtering, I-Q demodulators, I-Q IF amplifiers, and a 4-bit A/D converter, all in a single, compact 44 pin QFN package.

The on-board fractional N PLL can use four TCXO reference frequencies, enabling it to share the TCXO with other functional blocks like the CPU, the voice RF receiver or the baseband IC. This multiple system reference clock enables the IC to share the TCXO function across a variety of different hand-held communications platforms.

In stock and available now, the UPB1009K is priced at $4.30 in 50K quantities.
California Eastern Laboratories
(408) 988-3500

Gallium arsenide HBT process

TriQuint Semiconductor, Inc. has introduced its high-volume TQHBT3 InGaP heterojunction bipolar transistor (HBT) process fabricated in its 150 mm Oregon wafer manufacturing facility. This process can enable designers of RF amplifiers for cell phone, WLAN, WiMax and broadband power applications to achieve increased gain, power level and efficiency for a given device size due to higher transistor performance.

TQHBT3 features TriQuint's flexible three layer metal system with over 6 microns of gold thickness. Die size for a given power level or function can be reduced, leading to lower part cost and printed circuit board area used. TQHBT3 features 2-micron and 3-micron emitter width transistors.

The preliminary process features a Vbe of +1.15 V, 130 Beta and 40 GHz Ft. The maximum available gain is greater than 22 dB at 6 GHz with a 3 micron emitter. The VSWR is 70:1 at 5 V supply. The breakdown voltage equals 24, 7, and 14 V.
TriQuint Semiconductor

Signal Sources

VCXO oscillator

Crystek Crystals Corporation has launched a low-current sine wave oscillator providing -150 dBc/Hz noise floor and consuming only 8 mA typical and 15 mA max current at 3.3 V. The output level is 0 dBm min into 50 Ω, and harmonics are lower than -20 dBc.

The oscillator is offered in 3.3 V and 5 V models, and in VCXO version (Model CVXO-083/085) and clock version (Model CCO-083/085). Both versions are packaged using industrial-standard 14-pin DIP package.

The oscillator generates frequencies between 10 MHz and 330 MHz. The low current consumption is useful in low-current budget applications. Extended temperature operating range of -40°C to +85°C and other custom specifications are also available.

The oscillator is priced starting at $20.00 each in volume, depending on specification.
Crystek Crystals Corp.
(800) 237-3061

Test and Measurement

GPRS network analyzer

Astellia has introduced the OCEAN-CIGALE GPRS, which supplies a number of multilevel Key Performance Indicators (KPI) on the effective network throughput and on the quality of service. Since the information is available from the PCU (Packet Control Unit) level down to the cell level, problems can be traced from an entire group of IMSI (International Mobile Subscriber Identity) down to a single one and at any critical part of the network per APN (Access Point Name). Operators can track, analyze and monitor element failures and optimize network performance even when data are ciphered, as this analyzer is capable of deciphering hundreds of thousands of ciphered IMSI.
(011.33) 2 99 04 80 60

2.7 GHz PXI RF vector signal generator

National Instruments' 2.7 GHz NI PXI-5670 RF vector signal generator is the latest addition to the company's RF product line, which also includes the NI PXI-5660 RF vector signal analyzer and Modulation Toolkit and Spectral Measurements Toolkit for LabVIEW 7 Express. The PXI-5670 module offers 16-bit resolution arbitrary waveform generation at 100 Msps (400 Msps interpolated), up to 256 MB of memory and 22 MHz real-time bandwidth.

This RF vector signal generator offers signal generation from 250 kHz to 2.7 GHz and can produce analog and custom digital modulation as well as standard digital modulation formats such as ASK, FSK, MSK, PSK and QAM.

The toolkit also offers functions to inject impairments into a communications system including IQ gain imbalance, quadrature skew and additive white Gaussian noise (AWGN). Visualization functions include trellis, constellation and two- and three-dimensional eye diagrams. NI-RFSG is a fully functional instrument driver and works with a variety of application software including LabVIEW 7 Express, LabWindows/CVI and C.

The generator is a combination of the NI PXI-5610 2.7 GHz RF upconverter, the NI PXI-5421 16-bit arbitrary waveform generator and the NI Modulation Toolkit.

The vector network analyzer is priced from $12,995
National Instruments
(800) 258-7022

Autocorrelator for laser diagnostics

Spectra-Physics has introduced the PulseScout, a new autocorrelator for ultrafast laser diagnostics.

The PulseScout gives customers the ability to measure laser pulse durations ranging from 20 femtoseconds to the picosecond regime, and can be configured for wavelengths from 420 nm to 1600 nm. With two user interchangeable detector modules, the autocorrelator extends to measure pulse widths from both, low energy, high (MHz) repetition rate oscillators and high energy, low repetition rate amplifiers. Equipped with an integrated spectrometer, the PulseScout enables simultaneous measurement of both, the temporal and spectral components of ultrafast laser pulses.

The PulseScout is a suitable diagnostic accessory for the new Eclipse femtosecond amplifier from Spectra-Physics as well as traditional Ti:sapphire-based lasers and amplifiers, optical parametric amplifiers (OPAs) and oscillators (OPOs).

Based on technology usng piezoelectric scanning, the PulseScout makes alignment of the autocorrelator head with the input laser beam simple by only requiring the centering of an internal reflection on the cross hairs of a translucent window mounted above the input aperture.

The PulseScout is completely self-contained with no requirement for oscilloscopes or computers for operation. A microprocessor-driven compact control unit with onboard LCD operates the autocorrelator head and the optional spectrometer through simple on-screen menus. Autocorrelation trace and spectrum can be displayed and analyzed on the screen, or downloaded to a remote computer via an RS-232 interface. All controller settings can also be set remotely through the same RS-232 interface allowing total integration into a computer-controlled experiment or test setup.

Broadband signal analyzer

Aeroflex Incorporated has added new signal measurement capabilities to its Celerity CS35000 Series Broadband Signal Analyzer and Recorder family (BSA). The Celerity BSA family is a modular test system designed to capture, analyze and record high-speed broadband signals. This analyzer is configurable up to 600 MHz.

For design and testing of analog or digital broadband signals or signal environments, the analyzer offers a single-instrument approach for performing simultaneous measurements of frequency, time and multiple demodulation parameters. The BSA encompasses the test capabilities of a spectrum analyzer, deep memory logic analyzer, oscilloscope and signal analyzer — all in one instrument. All signals are displayed in one window where the user can monitor up to 12 displays at once, all updating in real time.

The BSA includes software to analyze demanding broadband signals with digital speed and precision. Advanced software features and DSP-based analysis modules provide the latest tools to measure and characterize signals captured in BSA hardware or loaded from stored signal files.

In addition to the existing PSK and QAM demodulation modules, Aeroflex now offers the CS35000 Series with a wide variety of software analysis modules, allowing more in-depth analysis of broadband signals.

Engineers can measure and capture signals in the BSA with new software modules for FSK, MSK and AM/FM demodulation, for adjacent-channel power and multiple channel power, for radio-specific analysis including SINCGARS and LINK 16, and for statistics, EVM, and symbol rates. New BSA software features, in addition to the existing frequency spectrum display and time and modulation analysis capabilities, include parameter strip-chart display, parameter-based triggering, parameter logging, frequency-based analysis, simultaneous parameter analysis, time tagging on logged data and analysis on real-time or captured signals acquisition, analysis and recording applications.

Products are specified by bandwidth, dynamic range, signal memory, and options such as frequency downconversion, low phase noise sample clock, disk storage, multiple channels, mixed signals, and remote control.

Prices range from U.S. $65,000 for a basic configuration to $350,000 for the highest-performance instrument with software options.
Aeroflex Incorporated
(516) 694-6700

Tx and Rx

C or Ku Antenna

Patriot Antenna Systems' 3.8 meter C-band or Ku-Band transmit/receive antenna has four port feed assemblies. Many customers require the extra link margin that a larger antenna like a 3.8 meter can provide, for the hub station in their VSAT networks, a video uplink, or an SCPC central station. Every Az/El fixed Kingpost antenna is fully “upgradeable” in the field to a dual-axis motorized antenna with 180° H to H mount.

The form factor is a stretch-formed 3.8 meter antenna with kerf panels. This antenna allows for installation without the need of a crane or a lifting device.
Patriot Antenna Systems
(800) 470-3510

Flange mount drop-in isolator

REC's L series features up to 15 percent bandwidth in the 8.0 to 40.0 GHz range. The isolator is suitable for military and space applications and made of steel housing that is gold-plated for better RF performance. This temperature-stable device has a typical loss of <0.4 dB and a VSWR and isolation of >20 dB. It measures 0.25 × 0.50 × 0.18.
Renaissance Electronics Corporation
(978) 772-7774

GaAs HBT multiplier

Hittite Microwave Corporation has introduced a 9.9 - 12.7 GHz Active X2 Frequency Multiplier that is suitable for use as an LO multiplier in microwave radio, VSAT, radar and ECM applications, as well as in OC-192 clock recovery circuits.

The HMC369LP3 provides +4 dBm of output power that varies minimally vs. input power, supply voltage and temperature. All undesired fundamental and sub-harmonics are suppressed to 30 dBc with respect to the output signal level, while the low additive SSB phase noise of -142 dBc/Hz at 100 kHz offset helps the user maintain good system noise performance. The multiplier is housed in a 3 mm × 3 mm leadless QFN SMT package and consumes only 46 mA from a +5.0 V supply.
Hittite Microwave Corporation
(978) 250-3343

WLAN power dividers

JFW Industries has announced broadband two-way, four-way and eight-way power dividers designed specifically for WLAN applications. The 50PD-519 (two-way), 50PD-520 (four-way), and 50PD-521 (eight-way) operate from 2 to 6 GHz with a maximum insertion loss of 3.6 dB (3.4 dB typical). Each model will handle up to 5 W of continuous RF power and maintains a minimum isolation of 20 dB. SMA connectors are standard with custom designs available.
JFW Industries
(317) 887-1340

Helical bandpass filters

Temwell has introduced a series of helical bandpass filers available per customers' specification. The helical bandpass filters have a frequency range of 44 to 2550 MHz and are available in 75 or 50 Ω impedance. The insertion loss ranges from 1.0 to 8.0 dB.

The bandpass filters are available immediately with a minimum order of 10 pieces.

Two-stage GaAs MMIC doubler

Mimix Broadband Inc. has released a gallium arsenide (GaAs) monolithic microwave integrated circuit (MMIC) two-stage doubler that can be used to drive fundamental mixer devices. Using 0.15 micron gate-length GaAs pseudomorphic high electron mobility transistor (pHEMT) device technology, this doubler converts input signals in the 9 to 14 GHz frequency range to output signals in the 18 to 28 GHz frequency range. This device has +12 dBm output drive.

This doubler, identified as 12DBL0230, is ideal to drive Mimix's XR1002 receiver, and is well suited for wireless communications applications such as millimeter-wave point-to-point radio, local multipoint distribution services (LMDS), SATCOM, and radar applications.

The manufacturer performs 100 percent on-wafer RF, DC and output power testing on the 12DBL0230, as well as 100 percent visual inspection to MIL-STD-883 method 2010.

The chip also has surface passivation to protect and provide a rugged part with backside via holes and gold metallization to allow either a conductive epoxy or eutectic solder die attach process.

Engineering samples are available today from stock, and production quantities are available six to eight weeks ARO.
Mimix Broadband
(281) 988-4600.


Wideband power module

Stealth Microwave Inc. has introduced a wideband power module. The SM2040-37 is a 2.0 to 4.0 GHz solid-state GaAs amplifier designed for multipurpose use in military and wireless markets. This module has a linear gain of 37 dB and 5 W of output powerat the P1dB compression point. It operates from a single supply voltage of +12 V at 2.7 A of quiescent current. Features include over/reverse voltage protection, thermal protection with auto reset, and TTL logic on/off control. Forward power detection is available as an option.

The amplifier comes standard as a 5.0 inch × 2.5 inch × 0.8 inch module with six thru-holes.
Stealth Microwave Inc.
(888) 772-7791

MMIC amplifiers

Mini-Circuits has introduced MMIC amplifiers that are usable to 4 GHz. These high 25 dB gain amplifiers feature both a high IP3 of +38 dBm and a low 2.9 dB NF. Even after passing grueling operating life tests of 5000 hours at elevated ambient temperature of 125°C, these new rugged units still offer protection against unwanted transient supply voltages. Offered at a low price of $2.35 each (quantity 25) and $1.35 each (quantity 1000). Available from stock.
(718) 934-4500

Driver amplifier 800 - 3800 MHz

Hittite Microwave Corporation has improved the performance of the previously released HMC308. The HMC308 is a 800 - 3800 MHz, fully matched GaAs MMIC amplifier that is suitable for use as a transmit chain driver amplifier, or as an LO buffer amplifier driving high IP3 passive mixers in cellular/PCS/3G, fixed wireless and WLAN applications.

The HMC308 is a versatile, cascadeable driver amplifier that operates from a single +3 V or +5 V supply, has integrated DC blocks on both RF ports, and requires no external components. When biased with +5 V, the amplifier provides 18 dB of gain, and +20 dBm of saturated output power, while consuming 53 mA of current. This ultra small SOT26 SMT-packaged amplifier is a low cost, broadband device ideal for area-constrained designs.

Samples and evaluation PC boards are available from stock for sampling or sale.
Hittite Microwave
(978) 250-3343

Power amplifier

OPHIR RF's amplifier, model 4022, is a high-power amplifier that produces 200 W of CW power over the instantaneous frequency range of 2.7 GHz - 3.2 GHz. This unit was designed for S-band radar applications, such as military radar, airport surveillance and maritime navigation radar.

The 4022 comes standard with RF input overdrive protection, as well as the ability to withstand an infinite load VSWR mismatch, all in a 5U high rack-mount chassis.
(310) 306-5556

VHF and UHF amplifiers and integrated bandswitch

Vishay Intertechnology Inc. has released the first parts in a new family of dual-MOSMIC (MOS Monolithic Integrated Circuit) devices that combine two MOSMIC amplifiers, one intended for use in VHF applications and the other for UHF applications, and an integrated switch in the industry-standard SOT363 plastic package.

Each of the devices released features two different MOSMIC amplifiers with common source and Gate 2 leads. The first MOSMIC stage, which features a fully internal, self-biasing network-on-chip, is designed to provide for optimal cross-modulation performance and low-noise figures at lower VHF frequencies. The second MOSMIC stage is intended to provide superior gain and noise figure performance at the higher frequencies of the UHF range. It features a partly integrated bias for easy Gate 1 switch-off with PNP switching transistors inside PLL integrated circuits.

The devices' integrated band switch not only reduces the number of lines on the printed circuit board, but also lowers the number of external components required. Integrated antiserial diodes between the gates and source protect against excessive input voltage. The drain output pin of each stage is opposite to the corresponding Gate 1 pin in an “SOT363(L)” pin configuration. Both the TSDF12830YS and TSDF32830YS offer a high AGC range with a soft slope and a main AGC control range of 3 V to 0.5 V.

Samples and production quantities of the new dual-MOSMIC devices are available now with lead times of eight weeks for larger orders. Pricing for U.S. delivery in 100,000-piece quantities starts at $10.00 per 100 pieces.
Vishay Intertechnology Inc.
(401) 738-9150

Controller monitor

Dallas Semiconductor has introduced the DS1870, an LDMOS power-amp biasing and monitoring solution. The device optimally biases two LDMOS power amps over temperature and drain voltage/current variations. It also manages system monitoring. The high level of integration reduces component count, layout area, and speeds up the design of LDMOS power-amp modules.

Dual 256-step potentiometers enable optimal gate-bias operation for two LDMOS power amplifiers. The summation of two lookup table entries controls each potentiometer. The first lookup table adjusts for temperature variation in 2 degrees Celsius increments, while the second lookup table adjusts for variations in drain voltage (or other external parameters). The voltage range of the potentiometer output can be adjusted to provide fine resolution control.

Monitoring functionality is enabled by a 12-bit analog-to-digital converter (ADC) with three muxed analog inputs, plus VCC monitor and temperature sensor. A fault signal can be generated in response to an out-of-tolerance condition in any of these parameters. In addition, 32 bytes of user EEPROM are available for manufacturing or vendor data.

Communication with the devices is achieved over an I(2)C interface. Three address pins enable up to eight devices on a common serial bus. The DS1870 is available in a 16-pin TSSOP and operates from a 4.5 V to 5.5 V power supply over a -40 degrees Celsius to +95 degrees Celsius temperature range.
Dallas Semiconductor
(408) 737-7600

Digital Systems

14-bit ADC

A new 80 Msps, 14-bit analog to digital converter (ADC) from Linear Technology can provides designers of cellular base stations with a dramatic improvement in dynamic performance, according to the company. The LTC1750 eliminates the second intermediate frequency (IF) down-conversion stage. The device provides wide input bandwidth and dynamic performance for direct IF digitizing applications. The ADC undersamples up to 500 MHz input frequencies and delivers 84 dB spurious-free dynamic range (SFDR) with 140 MHz inputs and 74 dB SFDR with 350 MHz inputs. The device's wide bandwidth and AC performance are ideal for use in cellular base stations and broadband software radios, where it can directly digitize the first IF and eliminate the second IF down-conversion stage.

This ADC offers the flexibility to configure the input and the output specifically for the application. An on-chip programmable gain amplifier (PGA) allows multiple input ranges to optimize the performance. The larger input range offers low noise, and the smaller range lowers the gain requirements on the drive circuitry, making it easier to meet the IP3 requirements. If the input ever goes out of range, there is automatic indicator on the overflow pin. A separate digital output supply pin allows connection to low voltage DSPs, FIFOs or logic as low as 0.5 V.

Pricing for 1000-piece quantities begins at $32.30 each for the LTC1750.
Linear Technology
(408) 432-1900

Video add-on multiplexers

Transparent Video Corporation (TVC) has helped cut costs for stations seeking to upgrade to HDTV or increase ENG signal output by introducing two add-on multiplexers.

The MegaMux STL-4000 and MegaMux ENG-4000 add-ons provide digital capability to studio-transmitter links and quadruple the output of ENG transmissions, without the cost of buying additional microwave transmission equipment. Both MegaMux systems are supposed to improve bandwidth performance and expand the capability of existing equipment.

The MegaMux STL-4000 permits broadcasters to produce digital performance with existing studio-transmitter links. The compact, rack-mount system features advanced MPEG encoding, decoding and multiplexing technology, combined with mutlilevel, digital RF modulation.

The all-in-one design is easy to install and improves the performance of legacy STL equipment by converting the NTSC video signals to an MPEG-2 stream at approximately 6 megabits per second for SD programs and 19.34 megabits per second for HD. The MegaMux STL-4000 then multiplexes the signals to provide multiple program support over a single RF carrier.

Studios can transmit NTSC or PAL video and the DVB-ASI HDTV transport stream to the transmitter site simultaneously-without installing additional microwave transmitter links.

The MegaMux ENG-4000 does the job of four microwave radio links by compressing four channels of composite video and four channels of stereo audio, boosting the bandwidth capacity of ENG units by 400 percent without sacrificing video or audio quality. Its multiple signaling capabilities operate within parameters of proposed FCC bandwidth-reduction regulations.

The self-contained rack-mount system transmits multiple video NTSC signals over a single analog system. The MegaMux ENG-4000 is a complete four-channel real-time MPEG-2 encoder multiplexer.
Transparent Video Corporation
(650) 508-8699

WiFi and Bluetooth

Cavity filters for WiFi/802.11b networks

Digital Communications Inc. (DCI) has released a line of filters aimed at cleaning up RF interference issues in Wi-Fi/802.11b networks. DCI's line of cavity filters enable WISPs and other wireless Internet providers to minimize service-affecting interference issues while extending coverage. DCI has designed these filters to be efficient and easy to install.

With indoor and tower-mountable outdoor options available, DCI's filters can clean up 2.4 GHz ISM channels by attenuating ±25 MHz from the center frequency with 40 dB of rejection or better. These filters can be tuned to pass the whole 802.11b band, from 2400 to 2483 MHz, or specific channels, typically 1, 6 or 11, rejecting service-affecting interference from out-of-channel. Also available is an eight-pole waterproof amplified channel filter, offering 20 dB gain on the transmission path and 20 dB gain on the receive path, which allows for greater coverage without any loss of performance in the users data rate.

The cost of an eight-pole waterproof filter is $379.
Digital Communications Inc.


Antenna CD ROMs

Noble Publishing has introduced a series of CD ROMs for professionals involved with antenna design. The three CD ROM set includes the titles Introduction to Antenna Fundamentals, Performance of Fundamental Antenna Elements and Advanced Antenna Considerations I. The lectures are authored by Dr. Steven Best.

Introduction to Antenna Fundamentals introduces basic antenna concepts and definitions used in the antenna industry. Antenna characteristics such as VSWR, radiation patterns, directivity, gain, polarization, axial ratio, and EIRP are defined, and their impact on wireless system performance is discussed. The course also describes different antenna types, including resonant antennas, frequency independent antennas, aperture antennas, arrays and electrically small antennas.

Performance of Fundamental Antenna Elements describes the basic performance characteristics of elementary antennas such as the dipole, loop and slot.

Advanced Antenna Considerations I is intended to provide a better understanding of the properties of some more complex antennas used in a variety of different communication systems.

The three CD set is available immediately for $258.00.
Noble Publishing
(770) 449-6774

Designer's Guide

Hittite Microwave Corporation has released its 9th edition Designer's Guide catalog detailing more than 250 products. This publication includes 54 new RFIC and MMIC product data sheets, as well as quality/reliability, application and packaging/layout information on more than1900 pages. New features for 2004 include an expanded application notes section detailing 10 new product & application notes.

Full specifications are provided for more than 250 components including: power and linear amplifiers, gain blocks, LNAs, attenuators, frequency dividers/multipliers, mixers, modulators, switches and VCOs.
Hittite Microwave Corporation
(978) 250-3343