LINEAR/LOGARITHMIC CAPACITIVE TRANS-IMPEDANCE AMPLIFIER CIRCUIT
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United States of America Patent
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Issued Date -
Feb 2, 2012
app pub date -
Jul 27, 2011
filing date -
Jul 28, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A dual mode amplifier for photodiode output reads a photodiode providing a current input. An integration capacitor is connected to receive the current input and connected to a voltage output node. An input capacitor is also connected to receive the voltage input and drives an operational amplifier having an output connect to the voltage output node. A correlated double-sample (CDS) capacitor is connected to the voltage output node and a sample and hold circuit incorporating a sample and hold capacitor for sampling the CDS capacitor. A log function on (LOGON) switch is connected between the operational amplifier output and the voltage output node and a reset switch connected to short the photodiode. The LOGON switch sequentially operates in conjunction with the reset switch at the end of an integration time allowing the integration capacitor to retain an integrated current plus a log voltage by closing of the reset switch shorting the detector photodiode and offsetting the voltage on the integration capacitor into the negative voltage direction.
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