[sdiy] Frequency multipliers

[ASSI]

On Friday 04 June 2010, Joel B wrote:
> Are there some relatively simple analog circuits that can take an
> input sine frequency of x and output a multiple of x?

If you've got a single sine wave or a quadrature signal, you can use a 
multiplier to get double the frequency (or a square root circuit to 
half it).  Higher multiples are possible, but more cumbersome and less 
effective due to additional products you would have to cancel.  Or 
maybe you don't need to cancel them, since these by-products are also 
multiples of the input frequency.


Achim.
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