Low-level voltage-to-current converter circuit



This circuit delivers a precise low-level current, IL, to a load, RL. The design operates on a single 5-V supply and uses one precision low-drift op amp and one instrumentation amplifier. Simple modifications can change the range and accuracy of the voltage-to-current (V-I) converter.
  • Input: 0.49 V to 4.9 V
  • Output: 1 µA to 10 µA
  • Supply:
    • Vcc = 5 V/li>
    • Vee = 0 V
  • Load resistance: 0 Ω to 390 Ω
Precision op amps (Vos<1mV)
OPA333 Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier
Instrumentation amplifiers
INA326 Precision, Low Drift, CMOS Instrumentation Amplifier
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Type Title Date
* Circuit design Low-level voltage-to-current converter circuit PDF | HTML 09 Jan 2019
Application note How to Design a Simple Constant Current/Constant Voltage Buck Converter 26 Jun 2018

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TIPD107 Low-level V-to-I converter reference design, 0-V to 5-V input and 0-µA to 5-µA output

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