All the schematics I’m showing are of NON-Inverting op amps. The input is on the “+” terminal of the opamp. Where are you seeing an inverting opamp?
The 1.24V is a reference voltage .The positive terminal of the AMP is connected to resistive divider for sensing. I am trying to compensate a regulator. The EA output is connected to a P-Channel mosfet through a 10 ohm resistor. The output capacitor is a 1uf ceramic I’m trying to place a zero at the best location to get maximum BW. My simulations agree with the calculated values from the site I show above for a “Non –inverting” op amp.
I am able to obtain a 160 kHz BW and 48 deg PM using the compensation network in figure 1. I think I can improve that by using the compensation network in figure 2. Ideally I would like 260 kHz BW. But obviously I am calculating the poles and zeros wrong. I know where I want them but ...
OK., There was enough clues for me to identify that as inverting.,
1. Pole at origin., zero at (R1+R2)*C3.
2. Pole at origin and R2CT (where CT is the series equivalent of C1 and C2 (i.eC1||C2).
Two zeros and difficult to factorize !!