Untrimmed 12 bit monotonic all capacitive A to D converter

Details Untrimmed 12 bit monotonic all capacitive A to D converter Untrimmed 12 bit monotonic all capacitive A to D converter

1985-10-15

1987-05-26

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03M 138

Patent

active

046689362

ABSTRACT:
An M-bit all-capacitive analog-to-digital (A/D) converter is disclosed which includes 2.sup.N switched capacitors of substantially identical capacitance for use in determining the N most significant bits. Each of the capacitors have one terminal connected to a common node and its other terminal switchable to either ground or a positive reference voltage. At the beginning of a conversion cycle, the common node is at a potential indicative of a sampled analog input voltage, a first group of 2.sup.N-1 capacitors are switched to ground, and a second group of 2.sup.N-1 capacitors are switched to the positive reference voltage. For a given conversion cycle, selected capacitors of one of the capacitor groups are sequentially switched to drive the common node voltage to ground. A method is also disclosed for converting analog signals to digital signals utilizing parallel capacitive elements of substantially identical capacitance.

REFERENCES:
patent: 3251052 (1966-05-01), Hoffman
patent: 4195282 (1980-03-01), Cameron
patent: 4380756 (1983-04-01), Worsman
patent: 4531113 (1985-07-01), Abraham

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