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Article: Active-feedback IC serves as current-sensing instrumentation amplifier. (design ideas).
- Article from:
- EDN
- Article date:
- July 24, 2003
- Author:
CopyrightCOPYRIGHT 2003 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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HIGH-SPEED current sensing presents a designer with some significant challenges. Most techniques for sensing current involve measuring the differential voltage the current produces as it flows through a sense element, such as a resistor or a Hall-effect device. The differential voltage across the sense element is generally small and is often riding on a common-mode voltage that is considerably larger than the differential voltage itself. Accurate amplification of the differential voltage requires a differential amplifier with high input impedance, high CMR (common-mode rejection); wide input-common-mode voltage range; and high, well-defined gain. Traditional ...
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Article: Simple circuit provides high-side current ...
EDN;
October 12, 2000 ;
700+ words
... ... flowing through the high-side sense resistor, [R.sub.S]. The circuit needs an additional high-side supply, [V.sub.P]. If you use a low-voltage op amp, such as an OP90, [V.sub.P]= 1.5V is adequate, so you can derive this ...
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