Switched capacitor circuit adapted to store charge on a sampling

Details Switched capacitor circuit adapted to store charge on a sampling Switched capacitor circuit adapted to store charge on a sampling

1996-04-05

1999-02-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327390, G11C 2702

Patent

active

058724699

ABSTRACT:
A sampling capacitor interface circuit for storing charge on a sampling capacitor related to a sample of an input signal voltage during a charging phase and to transfer the stored charge to an output during a charge transfer phase, such input signal having bipolar voltages within a range above and below an input signal common mode voltage. The interface circuit includes a transistor having: an input electrode fed by the input signal; an output electrode coupled to the sampling capacitor; and, a control electrode. A controller is provided for producing a control signal having a first voltage during the charging phase and a second voltage during the charge transfer phase, such voltages being a unipolar voltage referenced to the input signal common mode voltage. A bias circuit is coupled to the input signal and has a level shifting capacitor coupled between the controller and the control electrode for storing a voltage during the charge transfer phase and for shifting the first voltage by the stored voltage during the charging phase to provide a voltage at the control electrode with a level sufficiently below the input signal common mode voltage to bias the transistor to a conducting condition during the charging phase over the range of input signal voltages.

REFERENCES:
patent: 3714466 (1973-01-01), Spence
patent: 5084634 (1992-01-01), Gorecki
patent: 5134488 (1992-07-01), Sauer
patent: 5140182 (1992-08-01), Ichimura
patent: 5347171 (1994-09-01), Cordoba et al.
patent: 5521546 (1996-05-01), Kim
patent: 5554951 (1996-09-01), Gough
patent: 5646570 (1997-07-01), Blodgett

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