Switched capacitor common mode feedback circuit for differential

Details Switched capacitor common mode feedback circuit for differential Switched capacitor common mode feedback circuit for differential

1997-04-08

1998-12-08

Mottola, Steven

Amplifiers

With periodic switching input-output

330258, H03F 102, H03F 345

Patent

active

058476016

ABSTRACT:
An operational amplifier circuit includes a differential operational amplifier and a common mode feedback circuit with first and second transistors (16 and 20) having source electrodes connected to first and second supply voltage conductors and drains coupled to first and second outputs of the operational amplifier, respectively. First and second capacitors (24 and 25) are connected in series between gate electrodes of the first and second transistors and have a common point connected to the first output. A first switch capacitor circuit periodically refreshes the first capacitor to a voltage equal to the average of the first and second supply conductor voltages minus first and second predetermined bias voltages, respectively. A second similar common mode feedback circuit is coupled to the second output a differential output voltage produced by the operational amplifier results in equal excursions of the first and second outputs on opposite sides of the common mode feedback signal.

REFERENCES:
patent: 4794349 (1988-12-01), Senderowicz et al.
patent: 4820998 (1989-04-01), Roessler et al.
patent: 4906943 (1990-03-01), Koch
patent: 5691720 (1997-11-01), Wang et al.
"A High-Performance Micropower Switched-Capacitor Filter", by Rinaldo Castello and Paul R. Gray, IEEE J. Solid-State Circuits, vol. SC-20, No. 6, pp. 1122-1132, Dec. 1985.

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