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Subject: Re: 1V voltage reference

Date: 06/20/00 at 9:57 PM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: 1V voltage reference posted by louis humble on 06/16/00 at 11:39 PM:

Hi, Louis.

I think I misunderstood before, but let's look at it this way.

If you have a 1.242 volt reference which you can trust, using a divider of 1.07K on top and 4.42K on the bottom, resistors which are both standard RETMA values, you will get a nominal 0.999934426 Volts from the divider. (Yes, I kind of got carried away with the decimals!). That divided down voltage could then be fed into a high precision, unity gain voltage follower op-amp.

How stable this will be is mostly dependent on cost. Vishay for example, has some extremely stable resistors and high precision op-amps are offered by many companies. Perhaps you might start with Analog Devices.

Good luck.

John Dunn - President
Ambertec, Inc.

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