Re: FFT on dsPIC33F

ip is 100mV peak(200mV p2p) fft result is 0x0014 (20)
ip is 200mV peak(400mV p2p) fft result is 0x0052 (82)
ip is 250mV peak(500mV p2p) fft result is 0x0080 (128)
ip is 300mV peak(600mV p2p) fft result is 0x00b2 (178)
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ip is 500mV peak (1V p2p) fft result is 0x0200 (512)
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ip is 1V peak (2V p2p) fft result is 0x07ff (2047)

Just a guess, but as you're voltage is doubling, the fft result is
increasing by 4X. Perhaps the fft output is relative to power
(magnitude
squared) and not voltage?


Thanks for responding you are quiet right. It is a power squared
function.
Thank you

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