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Cadence virtuoso tool related

salamkgp

I am using Cadence virtuoso 6.1.5. I am required to measure the SNR  at the input and output of some Analog Circuits simulated at Nyquist rate, using Spectral Analysis. When measured for an ideal sinusoidal source (from analogLib) with simple resistive load (and capacitive load), I was getting less than 50 dB. Kindly help me in doing the proper settings of the tool, so that the SNR for the ideal source may be high (expected to be above 180 dB).

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  • Andrew Beckett

    Does the fact that you're using analogLib_hspice mean that you're using HSPICE as the simulator? If so, I probably can't advise you on the best simulator settings.

    With spectre, I'd recommend you set the transient analysis option strobeperiod to match the sample points - i.e. 163.84u/16384 - or 10n.

    There are various other strategies for doing this, but that would work well. With spectre that would cause the simulator to solve at (at least) the strobe points, which tends to remove interpolation error during sampling.

    Regards,

    Andrew.

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  • Andrew Beckett

    Does the fact that you're using analogLib_hspice mean that you're using HSPICE as the simulator? If so, I probably can't advise you on the best simulator settings.

    With spectre, I'd recommend you set the transient analysis option strobeperiod to match the sample points - i.e. 163.84u/16384 - or 10n.

    There are various other strategies for doing this, but that would work well. With spectre that would cause the simulator to solve at (at least) the strobe points, which tends to remove interpolation error during sampling.

    Regards,

    Andrew.

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