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Based on the General Cell concept, proposed a satellite system which integrated on-board computer, attitude and orbit control system and TT&C system into an integrated electronic system, and had carried out In-orbit test on Test Satellite III. The composition mainly includes the processor unit and RF unit. This scheme adopts embedded systems technology, SoC technology and RFIC technology as the...
Variable Gain Amplifier (VGA) is a crucial part of GPS receiver, because the amplitude of RF signal changes greatly in transport. So a VGA is needed to fit the signal changing. This paper presents a VGA design based on the Gilbert unit. Implemented in a 0.18um CMOS process, the circuit achieved a gain range about 20dB from 18.39dB to 38.54dB, and reached a GBW=250MHz at 38db. The total current is...
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