On Fri, Mar 12, 2010 at 11:39 AM, Mark E. Skeels wrote: > 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? > Depends on the circuit, but sometimes you can make a virtual ground at +1 volts and refer measurements to that. Regards, Mark markrages@gmail -- Mark Rages, Engineer Midwest Telecine LLC markrages@midwesttelecine.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist