FW: Texas Instruments IC's

[Tony Clark]

> The "discharge path" should be a short loop, you are dumping the cap across
> itself... OTOH that will make a major league magnetic pulse. Keeping 
> other stuff away will be good... and minimising the stray inductance 
> will help speed things along...
 
   Um, in the case of the ASM-1 style VCO, the cap is being discharged 
into the op-amp's input which is more or less virtual ground.  Who knows 
what is going on when it has to sink the current but I doubt that any 
sort of grounding plan will help any.

> I don't think the star ground will play for the discharge reason, but it is
> Really GOOD practice anyway...

   Right...
 
> Please update my thinking if I've got the discharge path wrong...

   No, right discharge path!  I would think that possibly any input 
offset voltage might be seen on the output, but in the case of most 
op-amps it'll be pretty neglibile!
   Am I off?  It's been too long since I had op-amp theory!

   Tony

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