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Transimpedance amplifier.....

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Rcy

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Hai... I have designed a folded cascode opamp and need to convert to a transimpedance amplifier for pulse oximetry application.... so the input of the transimpedance amplifier is a photodiode which generates the equivalent amount of current.... but i know that the current generated by a photodiode for pulse oximeter application consists of nA range ac and uA range dc... so how should i simulate my input..... can i connect a current source with parallel resistance to simulate a photodiode....
 

A simple photodiode model is a current source with a capacitor and resistor in parallel. The capacitor should be the value you expect from the photodiode at your chosen reverse bias voltage. The resistor represents the diode leaked resistance. You can make the current source have a large DC value with an AC component. Make sure you do transient analysis as well as AC.

Keith
 
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