hi,there
Recently i find a model of ideal opamp building with ideal components from analogLib in cadence IC5.It is shown below.
I think the net A and B are equal to inp and inn,so what's the effect of the two vcvs connecting them? Is it necessary? So as the net C and D,E and F.I think they are also equal with each other.So what does the second and third vcvs components perform? The gains of vcvs are all set to 1

And with the cmdmprobe component be placed in the end while the CMDM parameter be set to -1,dose it is used for the differential loop gain simulation?Like using a stb analysis to see the gain and phase of the closed-loop(open-loop?)?

BTW,I find there is iprobes in the cmdmprobe.Coz I dont use iprobe before.I guess that iprobe is a replacement of Middlebrook' method for loop stimulation.So I need not to inject a AC source and large res or cap or inductor like the classic method do,is it right?

Thanks in advance for any help!

Best regards
urian

Thanks,ray_wang.
If I use probe to test the stability of loop with stb analysis in spectre,need I inject a AC source in the loop,or just place the iprobe?