Home
Design & development

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
Download View video with transcript Video

Get started

  1. Read the circuit design
  2. Download the model

Technical documentation

star
= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 4
Type Title Date
* Circuit design Low (microamp), high-side, current-sensing circuit with current-sensing amp (Rev. A) PDF | HTML 25 Sep 2024
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

Related design resources

Design tools & simulation

SIMULATION TOOL
PSPICE-FOR-TI — PSpice® for TI design and simulation tool TINA-TI — SPICE-based analog simulation program
CALCULATION TOOL
ANALOG-ENGINEER-CALC — Analog engineer's calculator

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support.

Videos