Light receiving circuit
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United States of America Patent
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Oct 13, 2015
Grant Date -
Sep 25, 2014
app pub date -
Sep 10, 2013
filing date -
Mar 22, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
According to one embodiment, a light receiving circuit includes a light receiving element, a differential circuit, a fifth transistor, and first and second current sources. The differential circuit includes an amplifier and a bias circuit. The amplifier includes a first transistor, a second transistor, and a first feedback resistor. The amplifier is configured to convert a current from the light receiving element into a voltage. The bias circuit includes a third transistor, a fourth transistor, and a second feedback resistor. A reference voltage is supplied to a control electrode of the fourth transistor. The second and third transistors are included in a current mirror circuit. A fifth transistor has a control electrode connected to a connection point between the first and second transistors. A voltage signal switched to a high level or a low level according to a change of an optical signal is outputted.
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