eejli
Advanced Member level 4
stb cadence
I have a opamp with an RC feedback. I am checking its common mode stability using stb function. It turns out there are two loops in the common mode path and stb returns me an unstable result which may result from the tail current source finite output impedance.
The question is how I can know the stb's conclusion that the loop is not stable is right? Since the differential path stability is very good.
when I use the stb function do I need to beak the loop or just put the iprobe in serial with the loop without breaking the loop.
Thanks.
I have a opamp with an RC feedback. I am checking its common mode stability using stb function. It turns out there are two loops in the common mode path and stb returns me an unstable result which may result from the tail current source finite output impedance.
The question is how I can know the stb's conclusion that the loop is not stable is right? Since the differential path stability is very good.
when I use the stb function do I need to beak the loop or just put the iprobe in serial with the loop without breaking the loop.
Thanks.