Hello everyone, good evening (my timezone is evening now),
I am working on a school project on a differential chopper amplifier (simplified schematic attached).
When I simulated my feedback loop gain, I saw two spikes (sort of spikes, please kindly check picture) at 10kHz and 100kHz, which I cannot understand why.
My switching frequency is 5kHz and my input signal frequency is 200Hz.
I did PAC simulation with spectre and I got the result as attached for my loop gain (I calculated loop gain as db20 of loop output/loop input).
Does someone know why I have such response at 10kHz and 100kHz please?
I tried removing the choppers and simulated AC simulation and of course I do not have the spikes at 10kHz and 100kHz (shown in picture).
And also, can I say that my loop is stable from the loop gain plot?
I am really stuck, and I cannot understand why do I have such things at that particular frequency 10kHz and 100kHz.
Thank you very much for your kind answer and kind suggestion!
I am working on a school project on a differential chopper amplifier (simplified schematic attached).
When I simulated my feedback loop gain, I saw two spikes (sort of spikes, please kindly check picture) at 10kHz and 100kHz, which I cannot understand why.
My switching frequency is 5kHz and my input signal frequency is 200Hz.
I did PAC simulation with spectre and I got the result as attached for my loop gain (I calculated loop gain as db20 of loop output/loop input).
Does someone know why I have such response at 10kHz and 100kHz please?
I tried removing the choppers and simulated AC simulation and of course I do not have the spikes at 10kHz and 100kHz (shown in picture).
And also, can I say that my loop is stable from the loop gain plot?
I am really stuck, and I cannot understand why do I have such things at that particular frequency 10kHz and 100kHz.
Thank you very much for your kind answer and kind suggestion!