Programmable gain amplifier with single stage switched capacitor circuit using bandwidth balancing

   
   

A single stage switched capacitor programmable gain amplifier uses programmable capacitor values to adjust gain factors. The operation of the amplifier is described by a transfer function having two gain factors: (C1/C2) and (C2/C3). The gain factor of C1/C2 applies during the holding phase and the gain factor of C2/C3 applies during the sampling phase. The transfer function is equal to the product of the two gain factors: (C1/C2).times.(C2/C3) such that the transfer function is equal to (C1/C3). The intermediate element C2 can be adjusted to maximize bandwidth because C2 is independent of the total transfer gain. Accordingly, the intermediate element C2 is substantially fixed from the holding phase to the following sampling phase such that the bandwidth of the programmable gain amplifier is maximized in the two phases.

 
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