Noise modeling of opamp in frequency domain

Discussion in 'Cadence' started by ramesh, Dec 6, 2007.

  1. ramesh

    ramesh Guest

    Hi,

    I built an ideal opamp model (using ideal VCVS, resistors, caps
    etc).

    I have obtained a noise file from an amplifier (freq-noise voltage
    pairs for frequencies sweep from 1 -> 10 Mhz) using cadence noise
    analysis.

    I want to include this noise (as frequency-value pair) at input of the
    ideal opamp, and would like to observe the integrated noise @ output.

    There is a way to include the noise (time-value pair) as a file in
    transient domain (as vsource,vpwlf). However, I would like to include
    the noise as frequency-values pair.

    Appreciate if anyone could throw some light on this.

    Regards,

    Ramesh
     
    ramesh, Dec 6, 2007
    #1
  2. ramesh

    andrewb Guest

    From "spectre -h vsource"

    48 noisefile Name of file containing excess spot noise
    data in the
    form of frequency-noise pairs.
    49 noisevec=[...] V^2/Hz
    Excess spot noise as a function of frequency
    in the
    form of frequency-noise pairs.

    Voltage sources support a noisefile giving noise versus frequency
    pairs.

    Or you could implement the model using Verilog-A - which also allows a
    similar approach for modeling noise.

    Regards,

    Andrew.
     
    andrewb, Dec 6, 2007
    #2
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