Detection circuit with correlated double sampling with improved anti-blooming circuit
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United States of America Patent
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Dec 30, 2014
Grant Date -
May 31, 2012
app pub date -
Nov 28, 2011
filing date -
Nov 29, 2010
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Abstract
The detection circuit with correlated double sampling comprises two transimpedance amplifiers connected by means of a sampling capacitor. A photodiode is connected to the input of the first transimpedance amplifier. The circuit comprises an anti-blooming circuit connected between the input and output of the first transimpedance amplifier. The anti-blooming circuit comprises means for comparing the output voltage of the first transimpedance amplifier with a setpoint voltage defined by means of the output voltage of the second transimpedance amplifier. The means for comparing are connected to means for applying a feedback current to the input of the first transimpedance amplifier when the difference between the output voltage and the setpoint voltage reaches a limit value.
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