Hi,
I watched all the opamp stability videos and decided to follow an example by following Experiment 2 on the Stability - Lab video (https://www.youtube.com/watch?v=VQ3qikZ7Ffw&list=PLIb_jsYSp_95beKdP9rB86HIBaT9I247r&index=7). I mainly use Pspice so I saw that this video uses the OPA277 component which has a PSPICE model Rev H available from the TI website. I setup the circuit exactly like the video on Pspice and ran the bode plot simluation. The results shown on the video do not match the results on my pspice gain and phase outputs. For example, the initial circuit without Riso placed in shows a phase margin of 20deg at 0dB at around 350kHz. My Pspice results shows a phase margin of 19deg at 0dB at around 1.1MHz. Adding an Riso further reduces the phase margin instead of increasing it.. Can someone tell me if the video is incorrect or if my pspice simluation is incorrect?
Thanks,
