i am now designing a TIA in Cadence IC environment.

i know for LNA, i can use ports of 50ohm inner resistance for input and output ports, and use sp to simulate it.

however, for TIA, the input is current, and the port component output voltage only. so i want to know whether it is possible to simulate TIA using sp. thanks.

You can write the I-V transfer function as a function of S parameters. So you should be able to simulate it using SP. As your input/output ports are probably not 50 Ohm matched, you must consider this in your calculation.

What is the idea to use SP for simulation instead of "classical" AC simulation? I must admit I never tried SP on my amplifier designs.

Paul