A pipelined dual-channel switched capacitor programmable gain amplifier

Switched capacitor programmable gain amplifiers (SC PGAs) are used in a variety of applications including wireless baseband signal processing and automotive IC applications. The PGA simply boosts an incoming sampled analog signal before additional processing of that signal occurs further down-stream in the signal path. A number of applications often require the boosting of multiple analog input channels which often means including a dedicated PGA for every channel. In this paper a new pipelined dual-channel switched capacitor programmable gain amplifier with logarithmic gain stepping is presented. The new PGA offers a significant reduction in die area over solutions with dedicated PGAs. Furthermore, optimum gain matching characteristics between the two input channels are achieved due to the processing of both input channels with same hardware