Re: How can I subtract one frequency from another ???

Frank wrote:
> So, the next question is (now that I know what "kind" of device to
> use) what is the best mixer for this application.
>
> Is this a one IC solution, or do I have to design a circuit to my
> specification?
> Can I use the internal mixer of a max038, an XR2206, or even a 565
> PLL?
>
> What do you suggest for a simple low cost readily avalible mixer?
> Can they be designed with op amps?

Looking at the MAX038 data***, I don't see a mixer in there. The XR2206
has an amplitude modulation facility, so you could probably use that. The
NE565 contains a Gilbert Cell switching mixer, and pin 5 must be driven with
a square wave. You didn't say if your signals were sine or square. Two
square waves can simply be mixed using an XOR gate. For sine waves, you can
use a four-quadrant multiplier. I see someone in s.e.d mentioned the AD633.
I can second that recommendation. BTW you shouldn't use cross-posting.
It's better to multi-post, then everybody gets to see everybody else's
responses.


.