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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
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  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 (Rev. A) PDF | HTML 09 Feb 2023
EVM User's guide OPA547EVM, OPA548EVM User's Guide 10 Nov 2015

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