Switched-capacitor differential amplifier

Details Switched-capacitor differential amplifier Switched-capacitor differential amplifier

1991-07-18

1992-08-25

LaRoche, Eugene R.

Amplifiers

With periodic switching input-output

330 51, H03F 102, H03F 316

Patent

active

051422387

ABSTRACT:
The switched-capacitor differential amplifier circuit of the present invention employs a more efficient switched-capacitor network to provide a common mode range which is not limited by the amplifier power supply, and to achieve a high common mode rejection ratio at high frequencies with decreased sensitivity to component tolerances. The circuit employs a two-phase system, during the first phase of which, the circuit is auto-zeroed, the differential inputs are sampled and the capacitors are pre-charged. During the second phase, the differential inputs are disconnected and the bottom plates of the input capacitors are coupled together. The charge redistribution within the circuit forms an output potential that is proportional to the difference between the input signals, and that is offset by a user specified voltage. The present invention substantially eliminates the effects of parasitic capacitance.

REFERENCES:
patent: 4521743 (1985-06-01), Heimer
patent: 4617481 (1986-10-01), Masuda
patent: 4763088 (1988-08-01), Negahban-Hagh
patent: 4808942 (1989-02-01), Milkovic
patent: 4908579 (1990-03-01), Tawfik et al.

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