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Power Supply Rejection (PSRR) on two phased auto-zero comparator

Johanny Saenz

Hi all.

How could I performe a PSRR analysis of a two-phased auto zero comparator?


Could PAC help me on this case?

Thanks

  • Probably using PSS over the clock period of the comparator, and then PXF pointing at the output of the circuit - and then in the direct plot form for PXF you can click on your supply source - it would then tell you the transfer function from the supply to the output.

    Depending on what you need, you might need to look at sampled PXF - if so, there's an app note in <MMSIMinstDir>/tools/spectre/examples/SpectreRF_workshop (PSRR_Drv_AN.pdf) which talks about doing this on a divider to find the transfer function sampled at the point where the output of the divider changes (so effectively to look at how a signal on the supply affects the phase of the divider).

    Regards,

    Andrew.

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