the summing circuit does not work

suken

summing circuit

I want to realize this summing circuit based on feedback opamp for input signals of 10G. I just write a verilog A opamp for simulation, but the circuit seems not work. I am confused about how to bias this circuit and is that right to just connect the positive input to groud? what's more , how to choose the resistors here? thanks very much.

rong00i8

first, check whether  the opamp model you designed works well

suken

回复 2# rong00i8

I think it goes well. I pay most attention to the Gain and bandwidth in the model with one pole. I check it before and after adding the feedback.