Offset cancellation in a transimpedance amplifier (TIA) circuit
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United States of America Patent
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Sep 29, 2015
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N/A
app pub date -
May 20, 2014
filing date -
May 20, 2014
priority date (Note) -
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Abstract
Offset measurement and cancellation circuitry is employed in a transimpedance amplifier (TIA) circuit for directly measuring the offset in the TIA input voltage and for canceling the offset from the TIA output voltage. Employing the offset measurement and cancellation circuitry eliminates the need to use large transistors in the input stage of the TIA in order to reduce or eliminate the offset, which can increase noise and reduce Rx sensitivity. The offset measurement and cancellation circuitry of the invention obviate the need of making a tradeoff between the amount of noise and the magnitude of the offset that will be tolerated. The offset measurement and cancellation circuitry also eliminate the need for additional overhead in the decision threshold in order to avoid false triggering of the decision circuitry of the optical receiver due to noise.
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