[sdiy] Triangulation rant!

[harry bissell]

karl dalen wrote:
> Im looking for a very well defined triangulation method, in saw to triangle
> converters the diodes cuses a glitch (even if the diode is made out of a
> trannie) 
> wich usually is compensated by a cap, is there any other methods that temp
> variation and amplitude variations and glitch could be kept to an absolute
> minimum?
> Even if i have to go as far as keeping the triangulation cirquit in a oven!
>
>
> Any ideas folks?
>   
I had a similar need and did some modeling of a de-glitcher.

This worked by knowing in advance when the sawtooth retrace was about to 
happen
(I did know that, you might predict via amplitude...)

I followed the converter with a track/hold which is put in hold mode
during the retrace. The glitch becomes a flat-spot instead... much easier to
filter out, or just ignore

I w3anted it to work over a wide range of frequencies... the track/hold 
would introduce
some slew.. but a triangle has slew anyway.

I consider the idea workable but probably not practical unless you
(as Pink Floyd once said) "have a real need..."

H^) harry

> KD
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