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evaluation of PSRR in cadence spectre

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bharathr87

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How do u find the PSRR in cadence spectre through simulation? you have to give an AC signal at Vdde right?and after that how do you find the value of PSRR?
 

see the ac gain of the output voltage.
that is the ac gain Vout/Vdd,named PSR.
if you want to know PSRR,you must simulate the gain of Vout/Vin.
 

how to find the ac gain of the o/p...can u find it frm the ac gain plot?
 

see the ac gain of the output voltage.
that is the ac gain Vout/Vdd,named PSR.
if you want to know PSRR,you must simulate the gain of Vout/Vin.

if you connect your OPA as unity gain buffer, Vout/Vin=1
then , you can get PSRR from =PSR/1
 

mmic1978 said:
if you connect your OPA as unity gain buffer, Vout/Vin=1 then , you can get PSRR from =PSR/1

Uuummmm, is your gain going to be 1 for the entire frequency range? ;-)))

You better just use the ratio, that's safer.
 

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