Using Tayloe detector with fractional programmable divider

[twinsen]

Square wave VFO....

Hi all

I am fiddling with some direct conversion receivers. My question is this: I want a try using a Tayloe detector. For this I obviously need a vfo. Most of the designs I have seen use a DDS to achive high resolution tuning, but I was wondering if it wasnt possible to do it with some sort of fractional programmable divider or something, in an fpga maybe, since the Tayloe detector is nothing more than a analog mux driven by a square wave clock?

I hope this post make sense? - My digital electronics skills have taken a dive so I am hoping someone could put me on the right road

 

[hwswboy]

Re: Square wave VFO....

You are right, generate square wave clock any way you want.

Remenber that only question is clock must be 4x input frec.

 

[twinsen]

Re: Square wave VFO....

Thanks hwswboy

One more question though, OK so now I want to make a variable clock oscillator, so I guess one would either use a vcxo with some sort of PLL (I guess not a conventional one?) or run a high frequency clock and divide it down?

I have always just used a crystal on a specific frequency

What is the best method to get a high resolution variable clock?