Dear all,
I am designing a buffer scheme for which I did AC analysis in virtuoso and plotted Vout/Vin bode magnitude plot. For the same buffer I extracted all the DC operating point values and substituted in the Transfer function derived for this buffer scheme and plotted bode magnitude plot. I observed that there is a discrepancy in this two plots. The 3dB frequency and gain peaking is significantly different in these two plots. I guessed that it may be due to wrong method of extracting parasitic capacitances. Is there any other method for extracting these parasitic capacitances correctly?
Referring to the figure that I have attached,
C1=cgdbi1 + cgdbi2
C2=cdd1 + cdd2 + cgg3 + cgg4
C3=cgdbi3 + cgdbi4
C4=cdd2 + cdd3
Your suggestion would be really helpful to gain insights !!!
Thanks & Regards,
Tejal
