Transconductance amplifier for optical metrology applications of light-emitting diodes

T. Dönsberg, T. Poikonen, E. Ikonen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
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Light-emitting diodes (LEDs) have many applications in optical metrology. Depending on the measurement scheme, an LED might be driven, for example, using constant current, amplitude or pulsewidth modulated current, or current pulses. We present the design and characterization of a transconductance amplifier (TCA) optimized to drive LEDs in optical metrology applications. The device is capable of delivering peak and root mean square (rms) currents up to 10 and 1 A, respectively, and has a selectable transconductance ranging from 100 mu text{S} to 10 S. The typical cutoff frequency for the current output is around 10 MHz for various types of LEDs.

Original languageEnglish
Article number8804230
Pages (from-to)3704-3710
Number of pages7
JournalIEEE Transactions on Instrumentation and Measurement
Issue number6
Early online date2019
Publication statusPublished - Jun 2020
MoE publication typeA1 Journal article-refereed


  • Transconductance amplifier
  • light-emitting diode
  • pulse-width modulation
  • optical metrology


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