A 0.4um GaAs IQ modulator IC produces 60db image rejection at 880MHz using FET-based variable-RC phase shifters, amplitude detectors, and a negative feedback loop. The chip is 1.6x1.1mm2 and draws 250mA from -6V.
A 0.6um CMOS synthesizer performs 2.5Mb/s GFSK modulation on an external 1.8GHz VCO by dithering a divider within a phase-locked loop. The chip is 3x3mm2 and contains on-chip loop filter, pipelined digital MASH SIGMA DELTA converter, and 930MHz modulus 64 prescaler.
A fully-differential 1.575GHz GPS receiver is achieved in a 0.35um CMOS digital process. The 0.84mm2 die has 3.8dB NF LNA with 17dB gain and balanced mixer with +6dbm IP3 and 10dB NF. The circuit uses 3nH on-chip inductors and operates on a single 1.5V supply.
A 7.1mm2 software-programmable CMOS chip controls the ramp-up and ramp-down behavior of the power amplifier in TDMA systems. Supply voltage is 2.7V to 6V with 10uA current in power-down and 6mA in power-up mode.
In a 24GHz fT double-poly technology on-chip inductors are used for an LNA with 7.2dB gain, 4.2db NF, -35dB S11, and 7.7mW power at 5.8GHz. The mixer conversion gain is 21dB with 4.2dB NF, -22dB S11, and 26mW power. At 12.6GHz a Darlington stage has 8dB gain and -30dB S11. The circuits operate from single 3.3V supplies.
A variable-gain amplifier in 0.8um 12GHz BiCMOS has 90dB input dynamic range with 5dB noise figure at 45dB gain and -3dBm IIP3 at -45dB gain. The chip occupies 1mm2, uses a single 3.6V supply, and achieves <250MHz bandwidth over temperature.
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