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?