CIRCUIT060044

Improved howland current pump circuit

CIRCUIT060044

Overview

The “improved” Howland current pump is a circuit that uses a difference amplifier to impose a voltage across a shunt resistor (Rs), creating a voltage-controlled bipolar (source or sink) current source capable of driving a wide range of load resistance. See the AN-1515 a comprehensive study of the Howland current pump application report for more information on the functionality of the “improved” Howland current pump.
Features
  • Input: -5 V to 5 V
  • Output: -25 mA to 25 mA
  • Supply:
    • Vs+ = 15 V
    • Vs- = -15 V
    • Vref = 0 V
Precision op amps (Vos<1mV)
OPA192 High-Voltage, Rail-to-Rail Input/Output, 5µV, 0.2µV/˚C, Precision Operational Amplifier
General-purpose op amps
OPA990 Single, 40-V, 1.1-MHz, low-power operational amplifier

Get started

  1. Read the circuit design
  2. Read the application note

Technical documentation

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Type Title Date
* Circuit design “Improved” Howland current pump circuit PDF | HTML 07 Aug 2020
* Application note AN-1515 A Comprehensive Study of the Howland Current Pump (Rev. A) 26 Apr 2013
Application note Analysis of Improved Howland Current Pump Configurations 07 Oct 2020
EVM User's guide OPA547EVM, OPA548EVM User's Guide 10 Nov 2015

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