On Thursday 02 November 2006 12:51, DJ Delorie wrote: > > Be sure to check how long it takes the op-amps to come out of > > saturation if you intend to use this for high-speed signals. > > Comparators (ones with totem-pole outputs) are usually better suited > > to this application. > > I'll look into it. The thing about op amps is that they're cheap and > tiny.
Which frequently gets people into trouble when they try to use Op-Amps as Comparators: Analog Devices: "Issue 11: Comparators & Op Amps – May They Never Meet (Or Good Advice From Mr. Punch) The Question: Why buy an expensive comparator when an op amp is just as good? Download this article [pdf, 364,544 bytes]" http://www.analog.com/en/content/0,2886,760%255F788%255F87112,00.html TI: Op Amps and Comparators - Don't Confuse Them Operational amplifiers (op amps) and comparators look similar; they even have very similar schematic symbols. This leads a lot of designers to think they are interchangeable. There is a strong temptation to use a spare section of a multiple op amp package as a comparator to save money. This application note will explain why designers should not do this. http://encon.fke.utm.my/nikd/latest/sloa067.pdf Download .pdf (sloa067.pdf, 150 Kbytes)" To go along with the PDP-5, here are some Op-Amp notes from 1963 & 1966: http://focus.ti.com/docs/apps/catalog/resources/appnoteabstract.jhtml?abstractName=sboa092a -- http://www.softwaresafety.net/ http://www.designer-iii.com/ http://www.unusualresearch.com/ _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
