...get 90 degree phase shift of real time sinusoidal...

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Question by hema
Submitted on 3/22/2004
Related FAQ: comp.dsp FAQ [1 of 4]
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how to get 90 degree phase shift of real time sinusoidal signal from power lines after it is passed through an A/D converter

Answer by Sean Goddard
Submitted on 8/6/2004
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Your sample rate MUST be a mutiple of the frequency of the signal you are sampling. 128 times is about right if you are sampling mains. You can achieve this by using a PLL with a divide by 128 in the loop. All you have to do is clock in 128 bytes, words, dwords of what have you of data, then simply read 64 samples from the starting sample point. Voila instant 90 degree phase shift. You can get ANY angle you like by "upping" the sample rate further and doing the same.

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