Common mode control circuit for a switchable fully differential

Details Common mode control circuit for a switchable fully differential Common mode control circuit for a switchable fully differential

1997-10-10

1999-10-26

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

327554, 330253, 330258, H03K 500

Patent

active

059735376

ABSTRACT:
In switch-capacitor systems for extremely low supply voltage, employing a fully differential switched op-amp, proper functioning of nMOS switches coupled to the inverting input node of an integrated stage capable of outputting a common mode control signal is made possible by retaining the ground potential on the input node to prevent body effects on the threshold of nMOS switches by means of an auxiliary switched capacitor.

REFERENCES:
patent: 4697152 (1987-09-01), Westwick
patent: 4720686 (1988-01-01), Westwick
patent: 4794349 (1988-12-01), Senderowicz et al.
patent: 5359294 (1994-10-01), Ganger et al.
patent: 5391999 (1995-02-01), Early et al.
Malcovati et al., Proceedings of the Midwest Symposium on Circuits and Systems, Lafayette, Aug. 3-5, 1994, vol. 1, No. SYMP. 37, pp. 93-96, "Design of Analog Blocks for Low-Voltage Switched Systems".
Crols et al., IEEE Journal of Solid-State Circuits, Aug. 1, 1994, vol. 29, No. 8, pp. 936-942, "Switched-Opamp: An Approach to Realize Full CMOS Switched-Capacitor Circuits at Very Low Power Supply Voltages".
Castello et al., IEEE Journal of Solid-State Circuits, Dec. 1995, vol. 20, No. 6, pp. 1122-1132, "A High-Performance Micropower Switched-Capacitor Filter".

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