Em 12/3/2010 14:39, Mark E. Skeels escreveu:
> Hi, List.
>
> I am working on a mixed signal system and I need to generate a smallish =

> negative voltage, (say -1V or so) for use as a negative op =

> amp/comparator supply to overcome problems like comparators not swinging =

> to ground, etc.
>
> In the past, I have used ICL7660's or National LM2687, both work well; =

> solid enough and quiet enough, but they seem like overkill....does =

> anybody have a favorite, simple solution for something like this?
>
> Thanks,
>   =

>

Use a charge pump driven by a PIC's CCP module, or even generate the
frequency by software (interrupt) or use the CLKOUT pin.
All you need outside of the PIC is two fast diodes and two small capacitors.

Regards,

Isaac
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