Dear friends,
I am using the diffstbprobe to test the differential loop gain characteristics of my fully differential amplifier. I am connecting the amplifier with unity gain closed loop with inputs tied at the VCM. I put the diffstrbprobe as shown in figure below which I am sure it will break amplifier loop.
The simulation is working fine but I have two questions please,
Is the loop gain I am getting by running this simulation is the (vo1 - vo2) / (vin1-vin2) which is the true differential gain,
or it is with respect to one of the outputs, by this case I have to multiply it with 2 manually.
My second question please is when I run the STB analyses it give me two options for the diffstbprobe: differential and common. I use the differential option for the differential loop simulation, but does it it means that if I change the setting to common then I will be able to use the same probe for simulating the common mode feedback loop without changing the circuit configuration ?
Thank you very much in advance
