[time-nuts] Best way for generating 8994.03 MHz from 2899.00042272.....MHz?
Lux, Jim (337C)
james.p.lux at jpl.nasa.gov
Sun Aug 16 19:51:31 UTC 2009
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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