Abstract
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 output stage. The broadband pre-amplifier is required to reduce the inherently noisy differential cascode stage, and an output differential amplifier is used to provide output drive capability and differential to 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 control 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. >
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
