Threshold value operation circuit, and, and gate circuit, self hold circuit, start signal generation circuit using threshold value operation circuit
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United States of America Patent
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May 21, 2002
Grant Date -
N/A
app pub date -
May 1, 2000
filing date -
Jun 10, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a threshold value operation circuit which can perform an analogue type threshold value operation, and which can generate an AC signal with a stabilized frequency and duty ratio which is not influenced by input signal level or characteristic changes of the circuit elements and the like. A switching device (SWa) is switched by a switching signal (Sg) from an external AC source, to modulate an input signal (Vi) which is the subject of a threshold value operation. A modulation signal (V1) thereof is level detected by a level detection circuit (10) having a previously set threshold value, and if within a range of a predetermined level, an AC output (Vo) is generated from the level detection circuit (10).
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