Re: DDS filters

john larkin <jl@650pot.com> wrote:

I can use an Efinix FPGA and a bunch of cheap fast DACs to make some
DDS clock sources, specifically four. The pain is the lowpass filter.
 
Mini-Circuits and other folks make nice surface-mount lowpass filters,
but they are most all in the GHz range. I want maybe 25 MHz. You'd
think there would be a market for packaged MHz-range lowpsss filters.
 
It's worth pushing the DAC rate as high as possible to simplify the
lowpass filter. Stay far away from Nyquist.
 
 
 
 

Wouldn’t your nu- hertz package create a filter out of a few 0603 parts far
cheaper than a bought in filter?

--
piglet