Low level voltage pulse-converter

Details Low level voltage pulse-converter Low level voltage pulse-converter

1987-09-14

1988-10-18

Miller, Charles D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341172, H03M 152

Patent

active

047790741

ABSTRACT:
A convertor for converting an analog signal to a digital pulse comprises a switching capacitor which is charged by a differential analog signal supplied to the switching capacitor over an input circuit. The capacitor is discharged over an output circuit with the aid of a constant current supply. The charge level of the capacitor is proportional to the analog signal so that the time it takes the capacitor to discharge to a selected low charge level, is proportional to the analog signal. This time period is used by a microprocessor control to generate a digital pulse having a pulse equal to the discharge time for the capacitor. The microprocessor also selectively connects the input and output circuits to the capacitor for respectively charging and discharging the capacitor.

REFERENCES:
patent: 2937369 (1960-05-01), Newbold
patent: 3271651 (1966-09-01), Diederich
patent: 4178585 (1979-12-01), Takagi
patent: 4191942 (1980-03-01), Lone
patent: 4368457 (1983-01-01), Tsukada
patent: 4390864 (1983-06-01), Ormond
patent: 4644323 (1987-02-01), Chamran
Duke "IEEE Transactions on Instrumentation & Measurement", Feb. 1971, pp. 74-76.
Shum "Electronics Letters", Dec. 6, 1984, vol. 20, No. 25/26, pp. 1041-1042.

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