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No option of "Current" in Output Noise of noise analysis

RAO VINAY

 Hello all,

            I tried to extract output noise current of a single MOS transistor. But in Analysis->noise, under "Output Noise" option row, it is showing only two option of "Voltage" and "Probe" but not "Current" as an option (figure is attached). How can I plot output noise current through noise analysis of ADE L? My versions are IC 614-06.14-512, Assura 4.1 USR2, MMSIM 0720.593 and EXT101. Thank you.

 

Regards,

Vinay Rao.

 

  • Hi Vinay,

    If you pick "Probe" the idea is that you then specify a device (e.g. a resistor or a voltage source) to measure the current through - and then the output noise will be a current.

    Regards,

    Andrew.

  •  Thanks for your quick reply Andrew. I tried with the probe by selecting my MOS M0 in Output noise but when I plot "Squared Output Noise" under direct plot, values are shown in terms of V/sqrt(Hz) (figure is attached). Moreover it's not showing any option for plotting "Current" in "Main form (Results->Direct plot->Main form)". Also in the same figure, it's showing a downfall after around 10GHz and seems unreasonable.

  •  Sorry, I was not clear enough. From "spectre -h noise" :

    The noise is computed at the output of the circuit. The output is specified with either a pair of
    nodes or a probe component. To specify the output of a circuit with a probe, specify it with the
    `oprobe' parameter. If the output is voltage (or potential), choose a `resistor' or a `port' as the
    output probe. If the output is current (or flow), choose a `vsource' or `iprobe' as the output probe.

    So you need to probe either a voltage source or an iprobe component - it will then measure the current flowing through that source or probe (the voltage source would probably be a zero-volt source).

    Regards,

    Andrew.

  •  Thanks a lot Andrew. I used zero-volt source and now it works fine. 

     

    Regards,

    Vinay Rao.

     

     

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