nagamlan
Junior Member level 3
I indeed found that the PLL loop itself take care of the biasing part. I have a model to analyze the stability, in that model I have tested the 4th order active LF with a VCVS as amplifier. After stabilizing the loop, I put my LF in Transient model and it worked fine. But how to do the stability analysis with practical amplifier ?? As it wont have any kind of gain in AC simulation, due to initial case (the op-amp will be in linear). Also in AC simulation I cant set any initial fixed value in op-amp. I have attached my ckt...
