I want to multiply 100Hz sine wave to 10KHz with phase being preserved. Can anybody explain how to do it?
Can you please provide details of your application?
If we say frequency multiplier, by itself, your output is the harmonic of your input frequency.
mini-circuits offer some parts for it:
Frequency Multipliers - Mini Circuits
But in your case, I am thinking if you might need a phase comparator, or maybe a mixer. But it all depends on what you really want and your application.
I want to multiply 50Hz Sine signal to say 5KHz signal without losing phase information. Traditional plls convert only for square, but I need for sine wave?
DDS technology only offers frequency multiplication through an onboard PLL multiplier. You can work with images Super Nyquist, but not for the level of increase you are describing. The only way I can see using a DDS to accomplish what you are looking for would be to use the 50 Hz (or 100 Hz) signal to feed the IOUpdate function on one of our DDS devices, while have the device set to clear the phase accumulator (resetting the phase to 0), but if the 50 or 100 Hz signal is jittery at all your sinusoidal output may not be very pretty.
Incidentally - PLLs don't inherently output square waves, they are certainly capable of outputting sinusoids. I am not aware of any designed to run down to the rates you are seeking, though.
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