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Running PSS for an oscillator with a driving signal in some other part of the circuit.

RFStuff

Dear All,

I want to run a PSS and then do PNOISE of a circuit block which has also an Oscillator in it. The oscillator noisecontribution also I have to take into consideration. Due to some reason, I also don't want ot simulate the ocillator noise separately.

Is it possible to do it in SpectreRF ?

Could anybody please tell how it can be done if it is possible ?

Kind Regards,

Parents

  • This can be done with hb/hbnoise; it's not possible with PSS, since that requires a single tone only, and the common frequency with a driven signal + oscillator would be chaotic (highly nonlinear). Shooting QPSS also doesn't support it because it would essentially have to start again as it tried to solve for the oscillator frequency. 

    So we have added it for multi-tone harmonic balance analysis, but it's only been added via the HB analysis form itself. The feature is called "semi-autonomous harmonic balance", and there's an example (if my memory is correct) in the SpectreRF workshop at <MMSIMinstDir>/tools/spectre/examples/SpectreRF_workshop/rfworkshop.tar.Z (there's a database and a PDF inside).

    Regards,

    Andrew.

Reply

  • This can be done with hb/hbnoise; it's not possible with PSS, since that requires a single tone only, and the common frequency with a driven signal + oscillator would be chaotic (highly nonlinear). Shooting QPSS also doesn't support it because it would essentially have to start again as it tried to solve for the oscillator frequency. 

    So we have added it for multi-tone harmonic balance analysis, but it's only been added via the HB analysis form itself. The feature is called "semi-autonomous harmonic balance", and there's an example (if my memory is correct) in the SpectreRF workshop at <MMSIMinstDir>/tools/spectre/examples/SpectreRF_workshop/rfworkshop.tar.Z (there's a database and a PDF inside).

    Regards,

    Andrew.

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