Self-zeroing analog-to-digital conversion system

Details Self-zeroing analog-to-digital conversion system Self-zeroing analog-to-digital conversion system

1974-08-19

1976-09-21

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347SH, 340347AD, 328151, H03K 1302

Patent

active

039822419

ABSTRACT:
A self-zeroing, drift-free analog-to-digital conversion system is disclosed in which a single amplifier is shared between an analog-to-digital converter circuit and a sample-and-hold circuit. The offset errors generated by the sample-and-hold circuit cancel with the offset errors generated by the analog-to-digital converter circuit since the circuitry introducing the offset errors is shared. As a result, system offset errors are negated and the system enables changing from a unipolar to bipolar input range without inclusion of any additional circuitry. Usage of a gain preamplifier is provided with no corresponding system offset errors being introduced. moreover, usage of a differential-input gain preamplifier is also provided, with the self-zeroing feature resulting in greatly improved common-mode rejection.

REFERENCES:
patent: 3516002 (1970-06-01), Hillis
patent: 3653037 (1972-03-01), Utley
patent: 3706986 (1972-12-01), Petit
patent: 3736586 (1973-05-01), Donjon

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