Masked hysteresis in dual-slope analog-to-digital converter

Details Masked hysteresis in dual-slope analog-to-digital converter Masked hysteresis in dual-slope analog-to-digital converter

1979-04-19

1981-07-28

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

307350, 328146, 340347AD, 340347M, 340347CC, H03K 1320

Patent

active

042813174

ABSTRACT:
In a dual-slope A/D converter employing hysteresis, a reference voltage circuit sets the threshold of the comparator at three distinct levels in response to a ramp control signal and the comparator output. As a reference capacitor ramps through a threshold voltage, the comparator output shifts the threshold with positive feedback (hysteresis) to provide noise immunity. The ramp control signal then shifts the threshold back to its original level cancelling the hysteresis provided at the first comparator trip point. Thus, the comparator switches at the same voltage for both slopes eliminating offset error.

REFERENCES:
patent: 3942173 (1976-03-01), Wold

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