From: Jim Thompson
Subject: Re: Digital Meter Scaling Question
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Date: Mon, 07 Oct 2002 19:09:55 GMT
NNTP-Posting-Date: Mon, 07 Oct 2002 15:09:55 EDT
Organization: Cox Communications
On Mon, 07 Oct 2002 18:42:26 GMT,
"Spehro Pefhany" ,
In Newsgroup: sci.electronics.design,
Entitled: "Re: Digital Meter Scaling Question",
Wrote the following:
|To use an op amp with a 10:1 gain is possible, easy even, but you'll have
|to pick the op-amp carefully (Vos and TCVos and maybe Ib) and take into
|account the common mode range of the op-amp. Easiest to use (not cheapest)
|would be a rail-to-rail chopper op amp, which would be much better than
Brings to mind a discrete (OpAmps and analog switches) design I did
years ago (everything was years ago :) that was an auto-zeroing tracer
for measuring uV on PCB traces (for locating shorts).
I'll have to poke through the archives and see if I can find it.
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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