Analogue to digital converter

Details Analogue to digital converter Analogue to digital converter

1975-05-23

1976-05-25

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

324 99D, 340347AD, G01R 1700, G01R 1702, H03K 1302

Patent

active

RE0288330

ABSTRACT:
In an analogue to digital converter the unknown voltage is applied continuously to an integrating circuit during each conversion period. An opposing reference voltage is switched on and off to cause the amplifier output to ramp up and down between two detection levels. One or both of these levels varies as a periodic function of time, e.g. a sawtooth waveform. Clock pulses are counted when the slope of the output ramp is of one sign only and it is shown that the ratio of the unknown voltage to the reference voltage is simply related to the number of clock pulses actually counted when the slope is of said one sign and the total number of clock pulses occurring during the conversion period.

REFERENCES:
patent: 2824285 (1958-02-01), Hunt
patent: 3056047 (1962-09-01), Cooke-Yarborough
patent: 3258764 (1966-06-01), Muniz et al.
patent: 3287723 (1966-11-01), Metcalf
patent: 3305856 (1967-02-01), Jenkinson
patent: 3419784 (1968-12-01), Winn
patent: 3421093 (1969-01-01), Hinrichs et al.
patent: 3493961 (1970-02-01), Hansen
patent: 3500109 (1970-03-01), Sugiyama et al.

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