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Output power spectrum in Watts 1-tone vs 2-tone.

Question asked by MURPHY294 on Jul 13, 2006
Latest reply on Jul 13, 2006 by MURPHY294
While comparing the datadisplay equations in the 1-tone and 2-tone nonlinear simulations in the Amplifier Design Guide, I noticed a difference in the way the output power spectrum was calculated, in watts.

In the 1-tone examples it uses the equation:

Pout_W=0.5*real(Vload*conj(Iload.i))+1e-20

In the 2-tone examples it uses:

Spectrum_W=0.5*real(HB.Vload*conj(HB.Iload.i))

Now, besides the name of the variables, they should be the same.  I cannot figure out where the "+1e-20" term is coming from.

Any clues?  

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