Dynamic zero offset compensating circuit for A/D converter

Details Dynamic zero offset compensating circuit for A/D converter Dynamic zero offset compensating circuit for A/D converter

1980-04-11

1983-04-12

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, H03K 1302

Patent

active

043800050

ABSTRACT:
Disclosed is a dynamic compensation circuit for correcting the residual offset voltage encountered in an analog-to-digital conversion chain. Samples of an analog signal having an average value equal to 0 are provided to a first input of a comparator, the second input of which receives a reference signal generated through a D to A converter under control of a control logic circuit. A sample and hold circuit with the comparator causes a DC offset of the output signal level which is to be dynamically corrected by the compensating circuit of the invention. The DC offset causes the duty cycle to differ from one by an amount .DELTA.DC which will be the error curve signal of the compensation circuit. The compensating circuit reduces the .DELTA.DC to 0 by adding to the signal a DC voltage opposite to and of equal magnitude to the offset voltage level.

REFERENCES:
patent: 3105230 (1963-09-01), Mac Intyre
patent: 3761841 (1973-09-01), Jacquart
patent: 3953805 (1976-04-01), Couvillon
patent: 4140925 (1979-02-01), Meyer
patent: 4186384 (1980-01-01), Acker

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