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how to get the PSRR of the bandgap by hspice simulation?

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psrr hspice

expecting your answer !!


thank you!
 

bandgap psrr

AC analysis
add a ac source on the VDD(or gnd)
print the bandgap ac
 

hspice psrr

how about the following ?

....
vdd 1 0 sin(3 0.1 100k)

...

.tran 1n 100u

.probe v(*) i(*)

end
 

bandgap psrr simulation

allen's book ,page 320,
there is an example of PSRR for opamp,
Maybe you can refer
 

site:edaboard.com bandgap psrr

.tr is not a very good method
run .ac
 

bandgap simulation hspice

Ac analysis is the best method for PSRR
give ac source
vvpwr vpwr 0 VDC AC 1
use .ac statement
measure or view AC magnitude of output voltage.
It will give information of PSRR at different frequency
 

bandgap psrr hspice

in the ac analysis sweep the ac frequency from dc to 2nd harmonic of the logic core frequency ( The ac source is applied in series with the dc power supply)
Measure the ac gain (in dB) from the ac source to the o/p.

The graph thus obtained (gain vs freq.) is your psrr at various frequencies
 

hspice psrr simulation

-include the pkg-model and run both square and sine wave noise

can any1 give some commends on this one
thanks
 

analysis of psrr

Of cource , .ac analysis
 

simulation of power-supply-rejection ratio

add an AC signal to Power supply, and do tran analyze, see the output.
 

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