[sdiy] Frequency multipliers

Richard Wentk richard at wentk.com
Sun Jun 6 02:30:26 CEST 2010

If you use a sine VCO to drive a PLL you may as well use two VCOs 1V apart.

Also works for any frequency offset, as a more general solution that doesn't require hardwired trigonometric identities. 

I suppose you'll get some beating. But this *is* about music, isn't it? ;)


On 5 Jun 2010, at 20:26, René Schmitz wrote:

> George Hearn schrieb:
>>> Are there some relatively simple analog circuits that can take an  input sine frequency of x and output a multiple of x?
>> A phase locked loop (4046 etc) with a counter in the feedback path can
>> produce integer multiples of your input frequency, in-phase.  These will be
>> square waves but could be shaped.
> If you use a sine VCO to close the PLL, you can get sinewaves of course. Nothing forces you using the internal VCO of the 4046.
> Cheers,
> René
> -- 
> uzs159 at uni-bonn.de
> http://www.uni-bonn.de/~uzs159
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