Comparator circuit and infrared signal receiving apparatus
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United States of America Patent
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Feb 17, 2004
Grant Date -
Jun 19, 2003
app pub date -
Nov 14, 2002
filing date -
Nov 14, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention has an object to control easily the pulse width of an output by operating a limiting circuit appropriately even if the power voltage is low. A limiting circuit is provided on the input side of a hysteresis comparator circuit to prevent saturation. A limit voltage Vlimit is set by a bias circuit so as to change in accordance with the operation of the hysteresis comparator circuit. When an input voltage Vsig exceeds a hysteresis threshold voltage Vth, the limit voltage Vlimit is dropped in response to a drop of the hysteresis threshold voltage Vth. Thus, the width of the pulse width can be controlled while maintaining the condition that the limit voltage Vlimit is higher than the hysteresis threshold voltage Vth.
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