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Sensors 2009, 9(4), 2491-2497; doi:10.3390/s90402491

Chopper Stabilized Low Resistance Comparator

1 Serbian Transmission System / Nade Dimic 40, 19210 Bor, Serbia 2 Mining and Metallurgy Institute, Department of Informatics / Zeleni Bulevar 35, 19210 Bor, Serbia
* Author to whom correspondence should be addressed.
Received: 18 March 2009 / Revised: 6 April 2009 / Accepted: 7 April 2009 / Published: 9 April 2009
(This article belongs to the Section Chemical Sensors)
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The paper describes an improvement of the chopper method for elimination of parasitic voltages in a low resistance comparison and measurement procedure. The basic circuit diagram along with a short description of the working principle are presented and the appropriate low resistance comparator prototype was designed and realized. Preliminary examinations confirm the possibility of measuring extremely low voltages. Very high accuracy in resistance comparison and measurement is achieved (0.08 ppm for 1,000 attempts). Some special critical features in the design are discussed and solutions for overcoming the problems are described.
Keywords: Low resistance; measuring; chopper comparator; high accuracy Low resistance; measuring; chopper comparator; high accuracy
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Radetic, R.M.; Milivojevic, D.R. Chopper Stabilized Low Resistance Comparator. Sensors 2009, 9, 2491-2497.

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