Method and apparatus for determining the instantaneous power of a sinusoidal signal
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United States of America Patent
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Issued Date -
Oct 10, 2002
app pub date -
Apr 9, 2001
filing date -
Apr 9, 2001
priority date (Note) -
Abandoned
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Abstract
A method and apparatus for determining the instantaneous power of a sinusoid signal is provided. Generally speaking, the apparatus of the present invention determines the instantaneous power of a sinusoid signal without the need for filtering. This is accomplished based on the trigonometric identity sin.sup.2x+cos.sup.2x=1. By first splitting the incoming signal into two signals so that the resultant signals are 90 degrees out of phase with each other, and subsequently squaring the split signals and adding the squared split signals, the AC component of the original signal is effectively removed, leaving a DC representation of the square of the amplitude of the original signal without any residual AC component. The square of the amplitude of the original signal is directly proportional to the instantaneous power of the original signal.
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