Preamplifier
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United States of America Patent
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Sep 11, 2007
Grant Date -
May 18, 2006
app pub date -
Mar 25, 2004
filing date -
Mar 25, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A preamplifier includes a negative-feedback amplifier circuit that converts a current signal from a photodetector into a voltage signal; and a conversion-gain control circuit that simultaneously controls a resistance value of a feedback resistor portion of the negative-feedback amplifier circuit and a resistance value of a load resistor portion of the negative-feedback amplifier circuit, based on the voltage signal from the negative-feedback amplifier circuit. Each of the feedback resistor portion and the load resistor portion includes a fixed resistor element, a MOSFET element, and a diode-connected transistor, connected in parallel.
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