Variable threshold comparator interface circuit

Details Variable threshold comparator interface circuit Variable threshold comparator interface circuit

2006-05-23

2006-05-23

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S080000

Reexamination Certificate

active

07049859

ABSTRACT:
A signal processing circuit includes a comparator having a fixed and a variable reference input for detection of a positive quasi-sinusoidal waveform pulse. A signal detection circuit includes a low pass input filter, a voltage input clamp, a variable detection threshold, and a zero crossing detector. The circuit produces an approximately square wave output substantially coinciding with the positive pulse of the quasi-sinusoidal waveform received, from a variable reluctance sensor. The circuit has a positive to negative zero crossing detector armed by a variable threshold of the positive quasi-sinusoidal pulse, thus providing variable noise immunity and a fixed phase relationship between the input and output signal for an input signal having a variable amplitude.

REFERENCES:
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patent: 3725795 (1973-04-01), Mesenhimer
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patent: 4847577 (1989-07-01), Gerhart et al.
patent: 4926068 (1990-05-01), Fujita
patent: 5548242 (1996-08-01), Yasuda et al.

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