I have problems to simulate negative psrr in two stage opamp... If i consider an ac Vss in series with a dc VSS, if opamp is configured as buffer with V+ to ground, i should have Vout/Vss=1/ Psrr-, so Psrr-=Vss/Vout.....is this right? I've simulated this configuration in spice with dc VSS=2V and ac Vss=0.1V, so psrr- should be Vss(=0.1V)/Vout... My problem is bode plot of Vss/Vout: arg[Vss/Vout] has higher values at higher frequency and this is not possible: what's wrong? Using the same method with psrr+ i have the right bode plot, so i think i've done some error in plotting....Can you help me? Thanks in advance
- posted
15 years ago