[sdiy] 2164 4P LPF perfected

[Ian Fritz]

At 03:47 AM 10/25/2010, Tom Wiltshire wrote:

> > Well, you might be right, but I notice that people use the word 
> "quadrature"
> > even when only two waves are being generated.
>
>This case is what people call "biphase" surely? E.g. With both in-phase 
>and out-of-phase outputs.

Quadrature refers to two waves being 1/4 of a cycle out of phase. So it 
really doesn't matter if all four waves are physically generated.  And of 
course, the second two waves are just the inverses (x -1) of the first two.

Ian