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Programmable Gain Amplifier (PGA)

A

abdelrahman_19

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I have got a TIA, well-designed and connected with a Photo diode model for the process of recieving/sensing photocurrent and then converting it to a strong voltage output, I want to add a network of resistances and switches parallel with the Rf and C shunted at the TIA feedback, then only one switch works at a time then its branch is closed and the resistance of this branch is added to the TIA gain which mainly is (Av= Rf * Iin )

In Cadence Virtuoso, How can such something be applied?
 

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