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.
