Threshold crossing detector

Details Threshold crossing detector Threshold crossing detector

1989-12-11

1991-03-19

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 307480, 307518, 307527, 3075421, 348661, H03K 5153

Patent

active

050013645

ABSTRACT:
A method and apparatus is disclosed for forming a binary level output signal which has a single transition representative of a threshold crossing in a sensor output signal. The sensor output signal is applied to the inputs of two signal processing circuits, the first of which develops a first signal having a relatively fast transition representing the threshold crossing. The second circuit develops a second output signal that is representative of an integrated version of the sensor signal. In the preferred embodiment, a flip-flop receives the first signal at a clock input and the second signal at a data input. The flip-flop's set input may also receive the second signal. The resultant output signal from the flip-flop has but a single transition representing the threshold crossing, irrespective of noise-induced threshold crossings in the sensor output signal.

REFERENCES:
patent: 4169232 (1979-09-01), Henrich
patent: 4352999 (1982-10-01), Galpin
patent: 4665820 (1987-05-01), Chapman

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