Integrated preamplifier circuit for detecting a signal current from a photodiode
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United States of America Patent
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Jun 19, 2007
Grant Date -
Jun 2, 2005
app pub date -
Oct 27, 2004
filing date -
Nov 5, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
An integrated preamplifier circuit for detecting a signal current from a photodiode and converting the signal current into an output voltage is provided. The circuit includes a signal amplifier and a dummy amplifier, the dummy amplifier being matched to the signal amplifier. Each of these amplifiers includes an input transistor and an output transistor, the input transistor of the signal amplifier receiving an input signal derived from the signal current and the input transistor of the dummy amplifier receiving no input signal. The signal and dummy amplifiers provide the desired differential output signal. The input transistors of the signal and dummy amplifiers each have a biasing current source forced to follow a reference current source implemented within the integrated circuit.
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