danmc
Guest
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 Posted:
Fri Sep 02, 2005 4:10 pm Post subject:
tangent waveform calculator function with log plots? |
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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
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