Light receiving circuit
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United States of America Patent
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Nov 11, 2014
Issued Date -
N/A
app pub date -
Mar 19, 2012
filing date -
Sep 15, 2011
priority date (Note) -
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Abstract
According to one embodiment, a light receiving circuit having a trans-impedance amplifier and an output circuit is provided. The trans-impedance amplifier includes a photodiode, a feedback resistor and a first transistor having a channel of a first conductive type. The photodiode converts an optical signal into an electrical signal. Ends of the feedback resistor are connected respectively to the photodiode and a node. A gate of the first transistor receives the electrical signal from the photodiode. A signal corresponding to a signal from a drain of the first transistor is output to the node. The output circuit includes a second transistor having a channel of the first conductive type, and generates an output signal from a drain of the second transistor. A gate of the second transistor is connected to the node.
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