tshiu
Newbie level 6
Dear all:
When I simulate a LDO circuit by Spectre, I find a dominat pole at low frequency on Bode plot.
But in pz analysis of Spectre, there's no pole at low frequency.
Why the two results between Bode plot and pz analysis are quite different?
Does the miller cap compensation will effect the pz analysis results?
In my pz analysis:
Output Probe Instance: iprobe (between Vout and Vf)
Input Voltage Source: vdc (with ac=1V and generate the DC reference for err Amp)
Component Eval. Freq (Hz): 1
When I simulate a LDO circuit by Spectre, I find a dominat pole at low frequency on Bode plot.
But in pz analysis of Spectre, there's no pole at low frequency.
Why the two results between Bode plot and pz analysis are quite different?
Does the miller cap compensation will effect the pz analysis results?
In my pz analysis:
Output Probe Instance: iprobe (between Vout and Vf)
Input Voltage Source: vdc (with ac=1V and generate the DC reference for err Amp)
Component Eval. Freq (Hz): 1