[hpsdr] synthesizers.

[Naylor Jonathan]

Hi Frank

> A string of
> dividers off the VCO would allow 1 HZ tuning and low phase noise. I
> bet this would be cleaner than any DDS.

You don't need particularly fine stepping of the LO. The DttSP core is
quite capable of interpolating, so putting fine stepping requirements
onto oscillators is unneeded. At this present time DDS's just aren't
good enough for the most part, at least not when the quality of the
rest of the hardware is so high, it becomes the weak link.

There are some new fractional-N synthesizers coming out from AD which
run from a higher supply voltage which would provide a greater voltage
swing.

>   frank 

Jonathan  ON/G4KLX



 
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