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Maxim > Design Support > Technical Documents > Application Notes > Amplifier and Comparator Circuits > APP 4050
Keywords: negative voltage current sensing, instrumentation amplifier, current sensing
APPLICATION NOTE 4050
Current Sensing on a Negative Voltage Supply
Rail, using a Precision Instrumentation Amplifier
By: Akshay Bhat, Senior Strategic Applications Engineer
Prashanth Holenarsipur, Manager, Corporate Applications, Amplifiers & Sensors
Dec 21, 2007
Abstract: Applications like ISDN and telecom systems need a negative voltage, current-sense amplifier.
This application note describes one method for designing a negative-rail, current-sense amplifier. The
design is quite flexible and can be easily changed for monitoring different negative rails. The MAX4460
single-supply instrumentation amplifier is used to demonstrate the design.
Introduction
High-side current-sense amplifiers are used principally for monitoring the current from a positive supply
rail. Applications like ISDN and telecom power supplies, however, require current-sense amplifiers that
operate at negative rail. This application note describes one method for designing a negative-rail,
current-sense amplifier.
Application Example
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