Other Parts Discussed in Thread: OPA656, TINA-TI
I plan to build a circuit to measure 400VDC pulse, to measure the exact voltage of the pulse, I am trying to use OPA657 to simulate, when there is only one OPA657 in the circuit, the pspice can run simulation, but when there are 2 OP657 in the ciurcuit, simulation cannot run and says "there are no data values in section number 1 ignoring this section". when i change to other low speed OP-AMP, no this issue. I need a op-amp with high speed, high input impedance and low input bias current.
Could you have a look what's the reason. Attached the circuit and pspice file for your referrence.
Buy the way, in this circuit I don't use isolator, just use high value resistor divide 400VDC and get a low voltage common input to OPA657, is it safe for the OPA657 input? Thanks in advance.