Light receiving circuit and photocoupler
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United States of America Patent
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Oct 6, 2015
Grant Date -
Sep 25, 2014
app pub date -
Sep 10, 2013
filing date -
Mar 22, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A light receiving circuit includes a light receiving element, a transimpedance amplifier, a delay circuit and a comparator. The transimpedance amplifier is configured to convert the current signal into a first voltage. The comparator includes first to third current control elements each including first to third electrodes and configured to control current of the third electrode by voltage of the second electrode. The first voltage is inputted to the second electrode of the first current control element. Output voltage of the delay circuit is inputted to the second electrode of the second current control element. A second voltage is inputted to the second electrode of the third current control element. The comparator is configured to compare output current of the first current control element with sum of output current of the second current control element and output current of the third current control element.
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