Multiple ramp digitisers

Details Multiple ramp digitisers Multiple ramp digitisers

1973-12-21

1976-03-09

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, H03K 1320

Patent

active

039435067

ABSTRACT:
This invention relates to electronic analogue to digital converters of the integrating type wherein a capacitor is successively charged by an input signal and discharged by a reference signal, the time required for discharge serving as a measure of the amplitude of the input signal.
The invention provides a converter wherein the integrator has differential inputs and the control means applies successively the input signal and the reference signal to the same input of the integrator if these signals are of different polarity, but successively to different ones of the differential inputs if input signal and reference signal are of the same polarity.
The invention has application in measuring positive or negative input signals whilst employing a single principal reference signal and may be used advantageously in digital voltmeters for making d.c. measurements in the presence of interference.

REFERENCES:
patent: 3703002 (1972-11-01), Van Saun
patent: 3737892 (1973-06-01), Dorey
patent: 3737893 (1973-06-01), Belet et al.
patent: 3747089 (1973-07-01), Sharples
patent: 3750146 (1973-07-01), Lucas

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