AW: frequency shifter - BFO problems

[Christopher_List at Sonymusic.Com]

> So I am looking for a good sine shaper.

Wellllll, Analog Devices does make a "trigonometric function generator" IC
that'll turn a triangle wave into a sine or cosine wave, but they're
very expensive ($40each - I think). It uses a table lookup, but I think
the resolution is pretty fine.

But we all know you would be the last person to use a fancy expensive
chip for something you can do a lot more elegantly with a sneaky
transistor trick :)

> I think about
> using a differential pair with degenerated emitter - which happens
> to be built into one input of a MC1496 modulator already !!
...like I was saying....

- CList

ps.
OTOH, who knows, maybe you could call up AD and get a couple of samples :)