How to simulate CMRR & PSRR in Hspice ?

[vbhupendra]

How to simulate CMRR & PSRR in Hspice ?

if anyone has a template netlist for the simulation then it would be very helpful.

 

[kevinj]

hspice cmrr

https://inst.eecs.berkeley.edu/~ee140

check the design projects. there are diff pairs that have you simulate CMRR. open the files testbench.sp .

Never heard of PSRR

 

[avinash]

hspice cmrr 측정

for PSRR, connect the opamp in unity gain configuration.provide analog groung at i/p.provide ac analysis on vdd.trace the o/p in log domain.this will give you the negative of PSRR.for more details refer to allen hollberg book.

for CMRR,short the i/p with proper i/p offset voltage at either of the i/p such that shorting the i/p and providing analog ground at i/p give analog ground at the o/p.now give ac analysis to the i/p.trace the o/p.it will give you common mode gain.if you are already haiving differential gai.then
CMRR=(differential gain)/(common mode gain).for more details refer to allen hollberg book.
if you are liitle bit helped please do not forget to click "helped me" button.it will not cost you any point.