DC offset correction circuit utilizing switched capacitor differ

Details DC offset correction circuit utilizing switched capacitor differ DC offset correction circuit utilizing switched capacitor differ

1985-05-28

1986-12-30

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347M, 330 9, H03K 1302

Patent

active

046332235

ABSTRACT:
An integrated circuit employing a differential integrator and switched capacitor network to provide auto-zeroing. The differential integrator utilizes a feedback circuit between its inputs and outputs. A switched capacitor network coupled to the inputs of the amplifier provides voltage division of differential reference signals which determine the amount of DC offset. The amplifier then integrates the reference signals to a predetermined time constant, wherein the average voltage of the output of the integrator is used to provide auto-correction of the DC offset. A second switched capacitor voltage divider network and a second differential integrator cascaded to the first circuit provides a second time constant for fine-tuning the auto-correction signal.

REFERENCES:
patent: 4210872 (1980-07-01), Gregorian
patent: 4350975 (1982-09-01), Haque et al.

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