[time-nuts] Best way for generating 8994.03 MHz from 2899.00042272.....MHz?

[Lux, Jim (337C)]

That would be very nifty.  They have a DDS (or at least a patent on one)
that uses CORDIC to generate the samples, rather than a table of sin/cos, so
that might be a good start.  I suppose it's a matter of trading silicon for
the lookup table for silicon for the complex multiplier.  And, I would think
they'd want to still have the table, so the user can control with a phase
increment, rather than cos(increment) and sin(increment).




On 8/16/09 11:33 AM, "Rick Karlquist" <richard at karlquist.com> wrote:

> Lux, Jim (337C) wrote:
>> 
>> The usual DDS chips (e.g. From Analog Devices) have a built in table of
>> fixed length.  If you want to use something other than the power of 2 it
>> comes with, you'll need to implement the NCO in an FPGA, with an external
>> DAC.
> 
> Analog Devices is working on a variable modulus DDS, that should
> eliminate the need to roll your own with an FPGA.
> 
> Rick Karlquist N6RK
> 
> 
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