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Opamp CMRR and PSRR simulation

  • For CMRR and PSRR, you can do this with an xf (Transfer Function) analysis available in Spectre.
  • Set up your testbench sources for the supplies (of course), but also a source representing the common mode voltage.
  • Then run an xf analysis and tell it where the output of the circuit.
  • You can then plot the transfer function from every source to the differential output of the circuit.
  • Use calculator or an expression to plot CMRR=20*log(VDM/VCM) in the log-domain
how_do_i_simulate_cmrr_and_psrr.txt · Last modified: 2016/09/17 15:16 (external edit)