Again, You can never get phase infomation from dB.then how to convert dB into Magnitude and phase. How to get phase values for dB.
function y=dbv(x)
% dbv(x) = 20*log10(abs(x)); the dB equivalent of the voltage x
y = -Inf*ones(size(x));
if isempty(x)
return
end
nonzero = x~=0;
y(nonzero) = 20*log10(abs(x(nonzero)));
function y=dbp(x)
% dbp(x) = 10*log10(x): the dB equivalent of the power x
y = -Inf*ones(size(x));
if isempty(x)
return
end
nonzero = x~=0;
y(nonzero) = 10*log10(abs(x(nonzero)));
Hi,
dB is a value of ratio.
For values like voltage, current the above formula is correct.
For value like power "Mag = 10^(dB/10)" is correct.
Not quite.
The Bel is always a power ratio, by definition. A deciBel is 1/10 of a Bel, hence the "10" in the well-known formulae.
Since power is proportional to the square of the voltage, expressing voltage ratios in dB introduces an extra "2", hence the "20".
Hi,
Isn´t that what i wrote? At least i wanted to..
Klaus
The end result is the same, but your explanation implied there was a difference for power and voltage, whereas there is no difference.
Consider original point of this thread.
Decibel definition should be db20() not db10() for this thread point.
Yes.Is "magnitude" always considered to be voltage or current?
It can not be.Can´t it be power?
Phase(Angle) is refered in this thread, so it is voltage not power.The OP says nothing about S parameters nor Agilent (Keysight) ADS.
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