tangent waveform calculator function with log plots?

Discussion in 'Cadence' started by danmc, Sep 2, 2005.

  1. danmc

    danmc Guest

    What is the exact equation used by the tangent() function in the
    waveform calculator when plotting something on a log-log plot?

    Basically I'm trying to plot tangent lines for the 1/f^3 and 1/f^2
    regions of an oscillator phase noise plot.

    It seems from experimenting that the X and Y points are X in Hz and Y
    in dBc/sqrt(Hz) for the point you want to cross through. The slope
    parameter seems a bit strange. It doesn't seem to be dB/log(freq/1Hz)
    which is what I would have expected.

    The manual gave almost no help. It basically restates the text which
    already appears in the calculator dialog box.

    Thanks
    -Dan
     
    danmc, Sep 2, 2005
    #1
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