DC offset cancellation for a trans-impedance amplifier
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United States of America Patent
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May 6, 2008
Grant Date -
Jan 10, 2008
app pub date -
Jul 10, 2006
filing date -
Jul 10, 2006
priority date (Note) -
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Abstract
The invention relates to a DC offset cancellation circuit for a trans-impedance amplifier, which is typically used for converting an input current from a photodiode into an output voltage. The DC offset cancellation circuit utilizes the monitor current from a photodiode monitoring device to cancel the DC offset from the photodiode input current, enabling the conventional feedback circuit in the trans-impedance amplifier to be fully integrated.
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