Charge-balanced switched-capacitor circuit and amplifier circuit

Details Charge-balanced switched-capacitor circuit and amplifier circuit Charge-balanced switched-capacitor circuit and amplifier circuit

1993-10-05

1994-10-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 9, 330302, 307352, 307353, 320 1, 363 62, H03F 345

Patent

active

053592948

ABSTRACT:
A charge-balanced switched-capacitor circuit (50, 61) includes two capacitors (53, 54/72, 73) which are equalized by being connected in parallel during a first time period. This equalization cancels any mismatch in either capacitor (53, 54/72, 73) which would tend to affect an associated common-mode voltage. During a second time period, the two capacitors (53, 54/72, 73) are connected in series between two signal lines (42, 43). In one embodiment, the switched-capacitor circuit (50) forms a common-mode feedback sensing circuit by providing a common-mode feedback voltage to a fully-differential amplifier (41) at a common interconnection point of the two capacitors (53, 54). This embodiment draws no DC current, and thus prevents harmonic distortion of an output signal on the two signal lines when using a slew-rate limited amplifier (41). In another embodiment, the switched-capacitor circuit (61) functions as an input sampler at an input of a switched-capacitor amplifier circuit (60).

REFERENCES:
patent: 4697152 (1987-09-01), Westwick
patent: 5049831 (1991-09-01), Westwick
patent: 5237209 (1993-08-01), Brewer
Senderowicz, et al., "A Family of Differential NMOS Analog Cir. for a PCM Codec Filter Chip", IEEE Jour. of Solid-State Circuit; vol. SC-17, No. 6, pp. 1014-1023 (1982).
K. R. Laker; "Equi. Circuits for the Analy. and Synthesis of Switched Capacitor Netwrk. "; The Bell Sys. Tech. Journal, vol. 58, No. 3, pp. 729-769 (1979).

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