about psrr simulation of modulator

[imefly]

many designs need this speciality, how could simulate it with spectre?

pls give some help, if you have some experiences

 

[ankitgarg0312]

general idea for psrr simulation can be :

put a ac source in supply

vsupply vdd 0 dc supply ac 1v

perform a ac analysis , check voltage at output node and u will get psrr !!

 

[imefly]

the output voltage is digital signal

how could I do ?

the cmfb circuit is designed with sc circuits

I'm afraid that ac analysis couldn't carry out

I perform pss and pac ,however the circuits doesn't converge when pss simulation

general idea for psrr simulation can be :

put a ac source in supply

vsupply vdd 0 dc supply ac 1v

perform a ac analysis , check voltage at output node and u will get psrr !!

 

[ankitgarg0312]

ac analysis can be used if it is a digital output.
u can check internal nets that u think can be malfunction due to noise in supply

what is meaning of sc circuits here???

 

[imefly]

sc circuit is switch capacitor

ac analysis can be used if it is a digital output.
u can check internal nets that u think can be malfunction due to noise in supply

what is meaning of sc circuits here???