urawizard
Newbie level 4
What is the best way to simulate the frequency response of the self biased current source reference (aka constant GM current reference) as seen in razavi textbook?? (basic image below)
In transient domain, I can inject a pulse and see how the circuit corrects itself if stable. However, I want to see the frequency response and plot the gain and phase margin, but I cannot seem to get it working. I have the following questions:
Assuming there is additional circuitry and thus more than 1 loop i in the above diagram:
-how can I use stb analysis or ac analysis to probe the frequency response?
-Where do I break the loop if I have multiple feedback loops to measure the loop gain?
In transient domain, I can inject a pulse and see how the circuit corrects itself if stable. However, I want to see the frequency response and plot the gain and phase margin, but I cannot seem to get it working. I have the following questions:
Assuming there is additional circuitry and thus more than 1 loop i in the above diagram:
-how can I use stb analysis or ac analysis to probe the frequency response?
-Where do I break the loop if I have multiple feedback loops to measure the loop gain?