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Frequency Doubling

Question asked by electrojim on Jan 19, 2015
Latest reply on Jan 29, 2015 by electrojim

I'm using an ADAU144X at 192kHz in an application to double a 25kHz sinewave sync signal to obtain a 50kHz operating frequency.  Multiplying the signal by itself and DC-blocking the output does the job just fine, but intuitively I have this feeling that multiplying something by itself should just increase amplitude exponentially as the waveform rises from the zero crossing.  I am having trouble visualizing this process in four quadrants however.  I get about a 12dB loss through the multiplier, and although everything works I would dearly love to understand circuit action in non-mathematical terms.  Can someone explain this simply or point me to a source?  Thanks!