UHF RFID oscillator
Z-Communications' lead-free, RoHS compliant oscillator (SLV0868C-LF) in UHF band (864-870 MHz) features extraordinary low phase noise performance of -122 dBc/Hz at 10 kHz offset from the carrier. The unique design offers excellent tuning linearity with a typical tuning sensitivity of 3 MHz/V. It is designed to operate at 10 Vdc supply while drawing 27 mA (typical) over the extended operating temperature range of -40 °C to 85 °C. The device is ideally suited for applications that require signal stability, tuning linearity, and low phase noise performance.
The SLV0868C-LF comes in Z-Communications' industry-standard MINI package measuring 0.50 in. × 0.50 in. × 0.22 in. This VCO is ideal for automated surface-mount assembly and reflow; this is available in tape and reel packaging for production requirements. Furthermore, this technology is available for $29.95.
50 MHz CMOS op-amp
The LTC6244 is Linear Technology's latest addition to its family of low noise, precision CMOS op-amps. With a gain bandwidth of 50 MHz, the dual op-amp has input characteristics comparable to bipolar amplifiers. Offset voltage is 300 µV max over the full industrial temperature range. Using a unique architecture, the LTC6244 boasts low noise of 8 nV/Hz while maintaining an input capacitance of 2.1 pF.
In addition to minimizing the voltage gain error, the LTC6244 provides dc precision. It features 1 pA bias current and less than 100 µV input offset voltage at 25 °C. Offset voltage drift is guaranteed under 2.5 µV/°C while voltage gain is 120 dB. The 50 MHz gain bandwidth and 40 V/µs slew rate at a low supply current of 7.4 mA max per amplifier makes this amplifier versatile for a variety of applications.
Operating from supply voltages as low as 2.8 V and up to 12 V (HV version), the amplifier's output swings rail-to-rail. The LTC6244 dual op-amp is offered in 3 mm × 3 mm DFN and 8-pin MSOP packages. Fully specified to operate over the commercial, industrial and high temperature ranges, 1000-piece pricing starts at $1.65 each.
HBT driver amplifiers
The MAAMSS0072 and MAAMSS0073 are low-cost, two-stage driver amplifiers from M/A-COM, extending its family of broadband, high-linearity driver amplifiers. The broad frequency range, high linearity and reliability make this product family suited for wireless applications such as WiMax, WiBro and UMTS/WCDMA base stations.
The MAAMSS0072 and MAAMSS0073 driver amplifiers are fabricated using a high-reliability GaAs HBT process and achieve high third-order output intercept performance over a wide power range. The usable bandwidth is extremely broad, ranging from 250 MHz to 4000 MHz. The amplifiers can be optimized for a specific frequency range with external matching components and are housed in Pb-free, RoHS compliant 4 mm2 PQFN plastic packages.
These linear amplifiers are ideal for greater than 2 GHz linear applications by achieving higher gain while still maintaining linearity. The MAAMSS0072 is designed to achieve 23 dB gain, 27 dBm P1dB and 1.5% EVM with 18 dBm Pout for an OFDM signal (802.11d) at 3.5 GHz with an operating current of 235 mA. The MAAMSS0073 achieves 23 dB gain, 29 dBm P1dB, and 1.5% EVM with 21 dBm Pout for an OFDM signal (802.11d) at 3.5 GHz with an operating current of 590 mA. Both amplifiers maintain excellent linearity over a wide dynamic range when backed off from the maximum power levels.
The MAAMSS0072 and MAAMSS0073 are available and priced at $3.50 and $5.50, respectively in quantities of 12,000.
Hittite Microwave's logarithmic detector/controller product, the HMC600LP4 (E), is ideal for RF power measurement and control in cellular/3G, telematic, WiMAX and WiBro applications over the 50 MHz to 4 GHz frequency range.
The detector/controller is fabricated in a SiGe BiCMOS process, and converts RF signals at its differential input to a proportional output dc voltage. The HMC600LP4 (E) delivers an extremely high ±3 dB dynamic range of up to 75 dB, with outstanding accuracy and temperature stability from 50 MHz to 4000 MHz. In logarithmic detection mode, the HMC600LP4(E) provides a nominal logarithmic slope of 19 mV/dB. The RF input is internally matched to 50, and the device will operate with a supply voltage range of +2.7 V to +5.5 V, consuming only 30 mA.
Samples and evaluation PC boards for all SMT packaged products are available. Released data sheets are available on-line.
Skyworks has introduced a family of general-purpose gallium arsenide (GaAs) attenuators with excellent distortion performance for various types of linear applications including UMTS, WCDMA, WiMAX and WLAN. These GaAs digital single-positive-control step attenuators are also designed for base station transmitter and receivers, and can be used in radio-frequency identification (RFID) transceivers. Targeted at original equipment manufacturers (OEMs) building any type of receiver or modem, these broadband, low-insertion loss attenuators are built in small packages of only 3 mm × 3 mm.
The bilateral radio-frequency ports allow input and output. In addition, an external control voltage of only 2.7 V to 5.5 V is required. These products are available for sampling, and units of 10,000 are priced as follows: The SKY12322 (500 MHz to 4 GHz) is $2.10; the SKY12323 (500 MHz to 3 GHz) is $2.10; the SKY12325 (500 MHz to 6 GHz) is $1.70.
Maxim Integrated Products' high-performance SiGe I/Q modulator and digital RF variable-gain amplifier (VGA) chipset are designed for GSM/EDGE base-station transmitter applications. The MAX2021/MAX2023 I/Q modulators and the MAX2058/MAX2059 VGAs deliver a low-noise and high-linearity zero-IF transmitter solution.
Together, with the MAX5873 dual DAC and MAX4395 quad amplifier, these components form a digital baseband-to-RF VGA chipset that meets spectral-mask and noise-floor requirements for single-carrier GSM850/900 and DCS1800/PCS1900 EDGE base stations.
When cascaded together, the complete chipset delivers +15 dBm of output power, +32 dBm of OIP3, and an exceptionally low output-noise level of < -156 dBc/Hz (at 6 MHz offset). LO leakage (nulled) is also rated at <-40 dBc over the extended -40 °C to +85 °C temperature range. Complete line-up gain control is provided by the SPI-controlled RF digital VGAs, as the two on-chip attenuators support 12 dB of static control, 30 dB of dynamic control, and >10 dB of lineup compensation.
The chipset's noise and linearity performance is driven by the MAX2021/MAX2023 zero-IF I/Q modulators. Both modulators boast breakthrough output noise density levels of -174 dBm/Hz that match the theoretical thermal limit. These outstanding levels represent a 10 dB improvement over prior modulators/demodulators. In addition, the MAX2021/MAX2023 yield OIP2, OIP3 and OP1dB levels of up to 57.9 dBm/61 dBm, 22.3 dBm/23.5 dBm, and 16.7 dBm/14.3 dBm.
The MAX2058/MAX2059 RF digital VGAs yield 62 dB/56 dB of total adjustment range, +15 dBm of output power, 32.3 dBm/31.8 dBm of OIP3, and a low spurious emission of -39.2 dBc/-39.1 dBc at a 200 kHz offset.
The MAX2021/MAX2023 and MAX2058/MAX2059 are available in 36-TQFN and 40-TQFN packages. Prices start at $4.98 for the MAX2021/MAX2023 and $7.96 for the MAX2058/MAX2059, both for 1000 pieces.
Maxim Integrated Products
Driver and integrated power RFICs
Microsemi has added the DRF100 and DRF1200 to its high-voltage, flangeless-packaged, RF MOSFET power products.
The DRF100 is an RF driver IC with an 8 A output capable of driving high power, 500 V to 1200 V RF MOSFETs at frequencies up to 30 MHz. It also features a dynamic “anti-ring” function that prevents cross conduction of the MOSFETs in bridge or push-pull topologies.
The DRF1200 is an integrated solution comprised of the DRF100 RF driver IC and a high-power 1000 V RF MOSFET output. The close proximity of the driver and MOSFET in a single package reduces circuit inductance compared to discrete alternatives.
The DRF100 is available in the flangeless T3 package, while the DRF1200 is available in the T2 flangeless package. These packages lower thermal resistance and costs compared to copper tungsten flanged devices.
To obtain the high power dissipation, the backside of the new packages is lapped to provide an optimum thermal interface surface to mate with the system heat sink. The coplanar lead arrangement facilitates circuit layout and provides more than 2500 V isolation between any terminal and the mounting surface.
Both devices are designed for Class C, D and E RF generator applications operating from 1 MHz to 30 MHz, as well as for pulsed power and modulator applications. In 100-piece quantities the DRF100 is priced at $92.83 and the DRF1200 is priced at $206.44.
RF SPDT switch
The MASW-007107 from M/A-COM is a dc to 8 GHz SPDT switch for applications that require low insertion loss and fast settling times over a wide frequency range in an ultrasmall size.
In many linear systems such as WiMAX, multiple-input/multiple-output (MIMO) and ultrawideband, linear benchmarks are critical for superior system performance. The MASW-007107 is ideal for systems that require up to 27 dBm of output power (5 V operation) with EVM < 2% for an OFDM, 64 QAM, 54 Mbps signal. The associated linear output power at 3.3 V is 21 dBm.
M/A-COM's MASW-007107 is fabricated on a low-cost 0.5 m gate-length GaAs process with full passivation added for robust reliability while maintaining a low insertion loss of 0.5 dB up to 6 GHz and 0.7 dB up to 8 GHz, while limiting the isolation to 30 dB. All of this is achieved in a miniature 2 mm2 8-lead power quad flat leadless (PQFN) package. Each MASW-007107 switch is 100% RF tested.
The MASW-007107 is available and priced at $0.31 for quantities of 10,000.
Voltage-controlled SAW oscillator
Crystek's model CVS575 is a 622.08 MHz voltage-controlled SAW oscillator (VCSO) that is designed for high-performance PLLs.
The device is offered in a 5 mm × 7.5 mm × 2.5 mm SMD package. Phase noise is -130 dBc/Hz at 10 kHz offset, which translates to 150 fS (rms) max. jitter for SONET OC-192 (50 kHz to 80 MHz).
The CVS575 operates from -45 °C to +85 °C from a +3.3 V power supply; outputs are complementary LVPECL. Crystek designed the enable/disable function to be used with CMOS logic levels for ease of interfacing, eliminating the need to convert to LVPECL logic to turn the output on and off.
Applications for the CVS575 VCSO include frequency translation, clock smoothing, SONET/SDH/ATM networks, OC-192, and test and measurement. The CVS575 VCSO is available on line at Mouser Electronics (www.mouser.com). The price is $45 for commercial temperature range model in small volumes.
California Eastern Laboratories has range extension products for ZigBee and Class 1 Bluetooth networks. CEL's 2.4 GHz to 2.5 GHz evaluation boards combine NEC's newest GaAs HBT MMIC power amplifier with its miniature switch ICs. This front-end solution is designed to integrate with ZigBee transceiver ICs. These NEC devices can be configured to provide straight-through low-power output or amplified output for longer-range applications.
The evaluation board (P/N UPG2314T5N-ZBT-EV-A) features the UPG2314T5N power amplifier. The UPG2314T5N PA delivers up to +20 dBm output power with current consumption of 65 mA. It has low power consumption and a 1.5 mm × 1.5 mm package.
Also featured is the UPG2214TK RFIC switch, NEC's 0.5 W SPDT GaAs switch IC. This device delivers 0.35 dB insertion loss, high isolation and power-handling capability, and guaranteed performance at 1.8 V control voltage. Housed in 1.3 mm × 1.5 mm packages, two are provided on the board for applications requiring switched output.
California Eastern Laboratories