Waveform shaping apparatus

Details Waveform shaping apparatus Waveform shaping apparatus

1996-07-29

1998-04-21

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327100, 327165, 324 7662, 324169, H03B 100

Patent

active

057421986

ABSTRACT:
An input voltage Va and a threshold voltage Vc are compared in a comparator 21 to shaping the waveform of a sensor signal. The period of the output signal of comparator 21 is measured by a period measuring circuit 4. A stepped waveform voltage generating circuit 5 generates a stepped waveform voltage based on the measured period. The stepped waveform voltage is converted into corresponding current in a V-I conversion circuit 6. The current of V-I conversion circuit 6 is supplied to a resistance 23d or 23e via an analog switch 22a or 22b which turns on or off in response to the operation of comparator 21, thereby applying a stepped offset voltage to input voltage Va threshold voltage Vc to perform the hysteresis operation.

REFERENCES:
patent: 4155037 (1979-05-01), Mazur
patent: 5357147 (1994-10-01), Ina et al.
patent: 5548242 (1996-08-01), Yasuda et al.
patent: 5576658 (1996-11-01), Hushimi et al.
patent: 5631585 (1997-05-01), Kinoshita et al.

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