Wave-shaping circuit

Details Wave-shaping circuit Wave-shaping circuit

1995-08-08

1997-05-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

327 37, 327 73, 327205, 327102, 327551, 327 72, H03K 508

Patent

active

056315856

ABSTRACT:
A wave-shaping circuit comprises a dynamic hysteresis generating circuit for generating a dynamic hysteresis voltage having a certain crest value and whose signal level attenuates at a speed proportional to a number of engine revolutions to mask an ignition noise superimposed on an input signal, and a threshold generating circuit for generating a threshold voltage whose signal level increases/decreases in proportion to the number of engine revolutions to mask an interference noise superimposed on the input signal and to reliably detect a minimum level of the input signal. Either the dynamic hysteresis voltage or the threshold voltage, whichever is higher, is selectively output as a comparison reference signal through a high-level selecting circuit.

REFERENCES:
patent: 4449061 (1984-05-01), Yasuda et al.
patent: 4902970 (1990-02-01), Suquet
patent: 5357147 (1994-10-01), Ina et al.

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