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CIRCUIT060039

Low (microamp), high-side, current-sensing circuit with current-sensing amplifier

CIRCUIT060039

Overview

This circuit demonstrates how to use a current sense amplifier to accurately and robustly measure small micro-amp currents and maximize dynamic range. The following error analysis can be applied to many current sense amplifiers. This design relies on using a precision, low input-bias current sense amplifier and analyzing the dynamic error due to input bias currents on large shunt resistors.
Features
  • Input:
    • Iload = 1 μA - 104 μA
    • Vcm =  –0.1 V ≤ Vcm ≤ 40 V
  • Output:
    • Vout = 31.0 mV at 1 μA and 3.224 V at 104 μA
  • Supply:
    • Iqmax = 65 μA
    • Vvs = 3.3 V
    • Vee = 0 V
  • Temperature
    • Low = 0°C
    • High = 85°C
Analog current-sense amplifiers
INA190 — 40-V, bidirectional, ultraprecise current sense amplifier with picoamp IB & ENABLE
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Technical documentation

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Type Title Date
* Circuit design Low (microamp), high-side, current-sensing circuit with current-sensing amp 08 Jan 2019
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Application brief Using An Op Amp for High-Side Current Sensing (Rev. A) PDF | HTML 07 Dec 2021
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021

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