emeraude
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Your phase plot is wrapped phase.My unity gain frequency is 3.12MHz.
The corresponding phase at f=3.12MHz is 157 degrees.
So what is my PM then? Is it 180-157=23? or 180+157=337?
Not good.In any case, is it bad or good? Pls help.
No.I'm using Star-HSPICE by Synopsys.
Attached is "Unwrapped Phase Plot".Uh I'm sorry. Its AvanWave.
........ Hi LvW! I'm still confused. How come my PM=0 deg and Pancho_Hideboo is saying that its -180 deg? I though i should look at it at my unity gain frequency = 3.12MHz w/c corresponds to 157 deg. And why are you saying that its at the stability limit even my PM=0 deg? Please explain further. Thank you very much.
Hi LvW,
I completely agree with your regarding the phase margim equal to 0 (that is, the Stability limit).
a) However, I have not understood what you explained with “without the sign inversion that takes places by closing the loop (negative feedback)”. Please, could you explain?
b) By the way, do you know the HSPICE command to plot phase at a node? The same that emeraude has used.
Thank you very much,
Wrong.now I understand why my PM=-180 deg...
Unwarpped phase is varied like following:64dB(100Hz), 0dB(3.12MHz), -96dB(100GHz)
0deg(100Hz), -180deg(3.12MHz), -360deg(100GHz)
It is accurate.I dont have any other tool besides from Avanwave.
Isn't it accurate?
I use Agilent ADS post processing environment or Cadence post processing environment even for results of Synopsys HSPICE.What type of plotting tool or design tool can you suggest which is more accurate than what I'm currently using.
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