Hi all

I've been trying  to model the PSRR of a voltage reference without sucess. Has anyone, here, done it before ?

I've got an ouput voltage that is taken from a look-up table, and need to add an equation taking into account the variations on the power supply. The PSRR is 40dB, i.e, any variations on the power supply will reflect at the output, attenuated by a factor of 100.

I've tried heaps of different ways and just couldn't make it. Need some help. Thank you.

The model you created will have a 1/f transfer function if it really is a capacitor. I would expect PSRR to be a frequency dependent value in which case you could also try to model it using a laplace_* function, as long as it has a pole at s=0 to decouple the DC levels.

Cheers,
Marq