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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?
 

mengcy

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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.
 

bharathr87

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

mmic1978

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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
 

PaloAlto

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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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