I wish to study the step response of the post signal conditioning circuit (differential to single-ended plus low pass filter) as shown in attached figure (Fig. 21). The differential output of the ACPL-790x is 0~2.5V (attached figure, Fig. 12). Since Cadence PSPICE Schematic (v9.1) does not have the PSPICE model for TL032A, I choose uA741. With ideal opamp model, the simulation result (see attached figure) looks ok. However, with uA741, the simulation result looks weird. Does anyone know why the outputs with ideal opamp and uA741 are so much different?
Cheers.