GAAS HBT 0.75-5 GHZ MULTIFUNCTIONAL MICROWAVE-ANALOG VARIABLE GAIN AMPLIFIER

We report on a GaAs HBT 3-stage variable gain amplifier operating over a 0.75-5 GHz frequency band. The amplifier is broken up into a single -ended HBT LNA pre-amplifier, an analog current steering differential cascode cell for variable gain control, and a differential amplifier o utput stage, The broadband pre-amplifier is required to reduce the inh erently noisy differential cascode stage, and an output differential a mplifier is used to provide output drive capability and differential t o single-ended conversion. The VGA has a maximum gain of 23.8 dB gain, an IP3 > 18 dBm, and a noise figure of 6.5 dB. The variable gain cont rol range is >35 dB. This chip demonstrates the versatility of HBT IC technology which can integrate digital, analog, and microwave circuit functions to achieve high performance in a single monolithic chip.