Precision capacitance to digital conversion system

Details Precision capacitance to digital conversion system Precision capacitance to digital conversion system

1975-07-02

1977-01-04

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

324 60C, H03K 1302

Patent

active

040018130

ABSTRACT:
A capacitance to digital conversion system wherein condition sensing capacitors are arranged with reference capacitors in a circuit configuration so as to eliminate the need for an absolute a.c. voltage thereby imparting a high degree of precision to the system. Primary error sources are virtually eliminated since all operations are performed on an error signal and a single oscillator drives both sensing and reference capacitors so that frequency variations in the output of the oscillator have no effect on the accuracy of the measurement being made. Additionally, the high degree of precision is accomplished with a significant reduction in hardware.

REFERENCES:
patent: 3562641 (1971-02-01), Fulks
patent: 3663955 (1972-05-01), Shimizu
patent: 3801902 (1974-04-01), Horowitz

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