Double balanced MMIC mixer offers higher IIP3 performance
M/A-COM debuts a new MMIC, double-balanced mixer for cellular (GSM/PCS) systems. Features of the MA4EX950H high-barrier mixer include high IIP3 performance, improved conversion loss (6.1 dB at 900 MHz), high port-to-port isolation and wide bandwidth (700 MHz to 1200 MHz). The IC mixer is comprised of two single-ended mixers and two baluns to provide the necessary external port impedances during switching. The balun is the main contributor to port-to-port isolation and provides highly matched diode impedances. It also provides equal and balanced current feeds to the diodes and creates an accurate 180° phase shift between them. Design enhancements include spirals that are identical within and between each balun and more evenly balanced Schottky-to-Schottky quad diode with equal and uniform transmission lengths between each diode. Further improvements in die level performance are quantified in several parameters — particularly intermodulation suppression where an improvement of ~8 dBm is possible at high frequencies.
Specifications at a glance:
- 6.1 dB conversion loss
- 700 to 1200 MHz bandwidth
- RF VSWR of 1.25:1
- L-R isolation of 61.4 dB
Capacitors offer mil-qualified up to 270µf
AVX's SMPS MIL-qualified capacitors are now available with capacitance ratings from 0.056µF to 270µF. Designed for high-current, high-power and high-temperature applications, these stacked capacitors have low ESR and ESL. SMPS series capacitors are primarily used in input/output filters of high-power and high-voltage power supplies as well as in bus filters and DC snubbers for high-power inverters and other high-current applications. These capacitors are available in through-hole and surface-mount leads. Operating temperature range is — 55°C to +125°C.
AVX Corporation www.avxcorp.com
Frequency doublers for synthesizers and LOs
Mini-Circuits introduces the KBA-20 frequency doubler. It is aligned to 11 to 15 dBm (min/max) input power and produces twice the 1.6 to 2.2 GHz input frequency, realizing 3.2 to 4.4 GHz output frequency. It has a low 12 dB of conversion loss and 20 dBc F3 harmonic output, typical. The device has a 2.7 to 4.8 GHz input and a 5.4 to 9.6 GHz output frequency. At 10 to 16 dBm (min/max) input power, conversion loss is 12.3 dB (typ) and F3 harmonic output is 26 dBc (typ). It can be used with input power as low as 5 dBm with a slight increase in conversion loss.
Top phase-noise TCXO
Rakon announces a TCXO with the enhanced stability features of sub-ppm stability performance over a wide industrial temperature range of — 40 to + 85°C. This thru-hole temperature-compensated crystal oscillator has a wide range of frequencies from 8.2 to 32 MHz, with a clipped sinewave output and low aging of ±4.0 ppm. The TXO4080 model offers a 1 ppb/G, G-sensitivity. It has low power consumption of only 2.0 mA, and a low temperature hysteresis of ±0.4 ppm. Applications include point-to-point microwave, satellite, broadband wireless, military, telecom, and base stations.
Compact, industrial, temperature-rated oscillator
Z-Communications introduces another small PLL. In a package measuring 0.5" × 0.5" × 0.14", the PCA0163A integrates the phase detector, loop filter and VCO using advanced semiconductor CSP technology along with “0201” components. Operating at a frequency range of 160 to 170 MHz with an 80 kHz step size, this device is suited for fixed broadband wireless systems. It offers a clean spectral signal of — 80 dBc at a 10 kHz offset and — 105 dBc at a 100 kHz offset or, equivalently, a RMS phase error of 1.00° integrated over 100 Hz to 100 kHz. The harmonic suppression is attenuated at — 10 dBc and offers sideband reference spurs that are attenuated at greater than — 70 dBc. It draws 21 mA with a 3 V supply over an extended commercial temperature range of — 40° to +85°.
VCO for wireless Internet systems
Z-Communications' SMV2560A is a surface-mount, low-profile package VCO for wireless Internet systems. The VCO will generate frequencies between 2.535 and 2.675 GHz within a control voltage range of 0.4 to 2.9 VDC. The error voltage is taken directly from the IC's charge pump circuitry. Features of the VCO include a subminiature size, which measures 0.3" × 0.3" × 0.08", a spectral purity of — 84 dBc/Hz, typically, at 10 kHz from the carrier. It is specified to operate over the extended commercial temperature range of — 40°C to +85°C. The device draws 21 mA of current from a 3 VDC supply while providing the end user 7 (±3) dBm of output power into a 50W load. It also suppresses the second harmonic to better than — 12 dBc. It is suitable for automated surface-mount assembly and reflow, and the SMV2560A is also available in tape-and-reel packaging for production requirements.
GaAs IC pHEMT voltage-variable attenuator
Alpha announces the AV141-321 GaAs IC pHEMT voltage-variable attenuator, which combines price and performance over a high frequency range. It performs from 2.7 to 4 GHz, and is designed for use in power control applications for 3.5 GHz fixed wireless LAN applications. It has a minimum attenuation of 25 dB, as well as a typical insertion loss of 0.7 dB. It also features positive 0.2 VDC to 1.2 VDC control voltage and low cost. Featuring a surface-mount QFN-12 3 × 3 package, the attenuator is suited for high-volume applications.
GaAs MMIC Mixer with integrated LO, IF amplifiers
Hittite introduces the HMC421QS16 high-linearity down-converter receiver IC suitable for cellular infrastructure applications. It is designed to support W-CDMA applications where high OIP3 is required. A passive mixer coupled with a high-dynamic-range IF amplifier achieves an OIP3 of +29 dBm, and an input IP3 of +19 dBm. The converter provides a gain of 8 dB, and 10 dB typical single sideband noise. The IC operates from positive +5 VDC rails and consumes 60 mA of current. The mixer supports IF frequencies between 50 MHz and 400 MHz.
Commercial ceramic-based GPS diplexer
K&L Microwave introduces a ceramic-based GPS diplexer intended for commercial applications. The diplexer, with channels centered at 1227 and 1575 MHz, is suitable for both manual and automated installation while enduring temperatures as high as 205°C during reflow solder operation. Its small size and light weight make the unit suitable for pick-and-place manufacturing techniques. The nominal bandwidth of each channel is 60 MHz with insertion loss of 1.0 dB at center frequency, while achieving VSWR of 1.8:1 and 30 dB adjacent channel rejection. Overall mechanical dimensions for the diplexer are 0.9" × 0.625" × 0.25" (lwh).
CMOS switches target CATV applications
Peregrine Semiconductor announces the first two products of a new family of high-isolation, absorptive CMOS switches, the PE4232 and PE4240. These low-insertion-loss switches, operating from 5 MHz to 1300 MHz, are SPDT with the PE4232 offering isolation characteristics of >53 dB at 1 GHz and >90 dB at 5 MHz and input and output integrated 75Ω terminations. The PE4240 has an input 75Ω termination with the output port being open-reflective. They are available in six-lead, 3 × 3 mm MLPM packages and are true, single-supply devices with integrated on-chip CMOS control logic, providing a simple interface to other CMOS control devices. The single-pin control interface can also be driven by a +5 VDC TTL signal input. They exhibit power consumption of less than 30mA with a nominal 3 V supply. Both have a 1dB compression point of +30 dBm with an insertion loss of 0.5 to 0.8 dB over the operating frequency range. They exhibit a return loss on the order of 20 dB, video feedthrough of less than 15 mVpp and an input IP2 of 80 dBm.
AGC low-power amplifier
Maxim announces the MAX3861 low-power amplifier with automatic gain control (AGC) specifically designed for WDM transmission systems using optical amplifiers. Operating from a single +3.3 VDC supply, this amplifier linearly amplifies or attenuates the input signal to a fixed output voltage swing in a fully differential approach. Both the input and output are on-chip terminated to match 50Ω lines. It accepts differential or SE current-mode logic (CML) input data at rates as high as 2.7 Gb/s. The differential output swing can be adjusted between 400 mV and 920 mV (typ) over a 46 dB input dynamic range. Variation in output swing is controlled to within 0.5 dB over a 16 dB input variation. It provides an RSSI that is linear within 5% for input signal levels as high as 100 mV peak-to-peak and a loss-of-signal (LOS) indicator with programmable threshold. It is available in a 24-pin QFN package with exposed pad and operates from — 40 to +85°C.
System development tools
AeroComm introduces a set of RF development tools for its product line. Each kit contains radios and all accessories needed to build ConnexRF radios into most applications. Hardware items include ConnexRF transceivers, RS232 adapter boards, power adapters and cables, antennas, and documentation. Software is also provided on CD ROM. In a menu-driven format, these Windows/DOS-compatible drivers provide development utilities, allowing OEMs to perform tests for configuration modes, range measurements and data throughput. Plus, designers can easily program the radios to any configuration with the EEPROM viewer/editor feature. All transceivers have configuration parameters stored in EEPROM that are used to customize the serial interface mode and provide for general system setup. The modules are shipped with default parameters already configured to enable plug and play; these can be changed using the development tools or with custom interfaces developed by the OEM.
Ultra low-power transceiver
Xemics announces a highly integrated, low-power RF transceiver. The XE1202 enables systems with a minimal number of external components. When configured for low data rates, it is cost/performance-optimized for alarms, home security and long-distance keyless entry. For higher data throughput, it is applicable to voice-over-RF consumer applications. It offers low power consumption for battery-operated applications. It can operate in both European (868 MHz to 870 MHz) and North American (902 MHz to 928 MHz) frequency bands and is backward-compatible to the XE1201A transceiver operating in the 433 MHz band. The programmable on-chip filters allow for dynamic switching between narrow-band and wide-band operations, without any modifications to the external RF front-end design. It can transmit and receive data from 4.8 kb/s to 76.8 kb/s. RF output power can be programmed up to +15 dBm (31.5 mW) and the current consumption while in reception mode is 12 mA. The chip can handle multichannel and frequency-hopping, spread-spectrum communications.
LNA integrated with Tx/Rx duplexer
GHz has launched a new line of active microwave filters and duplexers for L, S and C-band. The model DPL-LNA-2327-10-20 duplexer-LNA assembly is designed for MMDS applications and integrates a high-power cavity transmitter filter, receiver filter and low-noise amplifier into a single compact module for performance improvement, space saving and cost reduction. It offers >20 dB gain with a noise figure of <3 dB for the receive channel and insertion loss of <1.5 dB for the transmit channel. Isolation between channels is >60 dB while input and output return loss is <16 dB with SMA connectors. The unit operates from 12 VDC (100 mA).
Receiver for in-building GPS systems
Fujitsu Microelectronics and Global Locate jointly introduce a low-power receiver for indoor GPS applications. Designed to add location capabilities to wireless products, the GL-16000 GPS baseband processor has 500 times more hardware correlators than a typical GPS receiver, providing fast start-up, with a time-to-first-fix of 250 ms. The chip requires less than 0.0005% of battery charge per fix. The processor can acquire satellite signals below — 158 dBm, enabling GPS signal reception indoors. It can be used with other tuners, depending on customer requirements. The chipset is highly integrated for minimum size and cost. The wireless system CPU interacts with the chipsets through a parallel/serial data bus.
Second-generation Bluetooth platform
Silicon Wave announces its second-generation Bluetooth components along with its connected solutions program, development tools and baseband IP licensing program. This second generation includes the SiW1701 radio modem and the SiW1750 and SiW1760 baseband processors. All of the ICs were designed to reduce power consumption, system cost and size, while allowing flexibility for implementing end-user products. The development tools include a wireless development system and a radio modem evaluation system. Additionally, the Baseband IP licensing program provides customers with a fast path to integrating Bluetooth baseband functionality into their system-on-chip ASIC designs.
Family of DACs for multiple platforms
Analog Devices introduces a family of octal eight-, 10- and 12-bit buffered voltage-output DACs that operate from a single 2.5 to 5.5 VDC power supply and consume 1.4 mA (max.) at 3 VDC. The eight-bit AD5308, 10-bit AD5318 and 12-bit AD5328 use a three-wire serial interface that operates at clock rates as high as 30 MHz and is compatible with standard interfaces. Integrating eight DACs on one chip, these converters are designed for space-constrained applications in optical networking, automatic test equipment, mobile communications, industrial process control and portable, battery-powered instruments. A power-down feature reduces the current consumption to 400 nanoamps at 5 VDC (120 nA 3 VDC).
Specifications at a glance:
- 8-, 10-, 12-bit DACs
- 2.2 to 5.5 VDC supply voltage
- Up to 30 MHz clock rates
- Power-down to 400 nA