ssuchitav
Junior Member level 3
Hi,
I am trying to simulate the circuit shown in the attachment. An ideal OPAMP model (dc gain=100dB UGB=1G) is used for CMFB. The input is of 100MHz.
The circuit is showing unexpected rail to rail swing instead of the expected across 1.25V. I have cheked the CMFB loop stabilty and it looks fine.
Please help me in debugging this behaviour.
Thanks in advance for your suggestions.
I am trying to simulate the circuit shown in the attachment. An ideal OPAMP model (dc gain=100dB UGB=1G) is used for CMFB. The input is of 100MHz.
The circuit is showing unexpected rail to rail swing instead of the expected across 1.25V. I have cheked the CMFB loop stabilty and it looks fine.
Please help me in debugging this behaviour.
Thanks in advance for your suggestions.