Multiplexed photocurrent monitoring circuit comprising current mirror circuits
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United States of America Patent
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Oct 29, 2013
Grant Date -
May 5, 2011
app pub date -
Aug 21, 2007
filing date -
Aug 21, 2007
priority date (Note) -
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Abstract
A low cost photocurrent monitoring circuit is provided. A photocurrent monitoring circuit, which performs monitoring by converting photocurrents output from a plurality of photodiodes (PD1 to PDn) into voltage, includes: a multiplexer circuit (MUX) for selecting one of input terminals to establish a connection of the selected input terminal to an output terminal, wherein the photodiodes (PD1 to PDn) are respectively connected to the input terminals; and an amplifier (LA) for converting a photocurrent which flows from a selected photodiode via the multiplexer circuit (MUX) into a voltage, and for outputting the voltage.
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