Yes, of course of course I do. ----- Original Message ----- From: "Olin Lathrop" To: "Microcontroller discussion list - Public." Sent: Tuesday, August 05, 2008 12:10 PM Subject: Re: [EE] ADC Input Buffer Circuit > Rich wrote: >>>> I have not followed this thread but the title caught my eye. One >>>> very important thing to remember when driving the input to an A/D >>>> is that the output impedance of the driver should be kept as low as >>>> possible in order to avoid aliasing and conversion error. >>> >>> Conversion error, yes. But A/D source voltage impedence has nothing >>> to do with aliasing. >> >> I disagree! Think it through. > > I have. Do you understand what aliasing means? > >> What happens if the source impedance >> is to high and cannot source the required current or even sinks >> current from the converter? > > Then you get a offset on the conversion. The A/D pin current times the > source impedence is the offset voltage. However this has nothing to do > with > aliasing. > > > ******************************************************************** > Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products > (978) 742-9014. Gold level PIC consultants since 2000. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist