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How to make a block Noise-less while doing Noise analysis in Spectre

RFStuff

Dear All,

I am doing Pnoise analysis of my Receiver.

I want to make some block NOT add any Noise. How this can be achieved ?

Kind Regards,

Parents

  • Better still, use Simulation->Options->Analog and then on the Main tab, at the bottom there is a NOISE OPTIONS section. You can decide to selectively turn on or off the noise contributions from blocks - there's a list of instances and a Select button to pick the instances.

    If using a really old version, you can achieve the same by using the Additional arguments field on the Miscellaneous tab, and entering noise_off=[I1 I2.I3] etc. The names have to be "netlist" names though. Much easier if you can use the UI by using a recent enough IC version.

    This works by internally in the simulator utilizing the isnoisy parameter of the devices (almost all devices support this now) but without you having to modify your schematics or requiring the CDF for the devices to netlist the isnoisy parameter. Note that for this to work for Verilog-A models which have noise contributions, they must implement an isnoisy instance parameter.

    Regards,

    Andrew.

Reply

  • Better still, use Simulation->Options->Analog and then on the Main tab, at the bottom there is a NOISE OPTIONS section. You can decide to selectively turn on or off the noise contributions from blocks - there's a list of instances and a Select button to pick the instances.

    If using a really old version, you can achieve the same by using the Additional arguments field on the Miscellaneous tab, and entering noise_off=[I1 I2.I3] etc. The names have to be "netlist" names though. Much easier if you can use the UI by using a recent enough IC version.

    This works by internally in the simulator utilizing the isnoisy parameter of the devices (almost all devices support this now) but without you having to modify your schematics or requiring the CDF for the devices to netlist the isnoisy parameter. Note that for this to work for Verilog-A models which have noise contributions, they must implement an isnoisy instance parameter.

    Regards,

    Andrew.

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