Transconductance amplifier for optical metrology applications of light-emitting diodes

Timo Dönsberg (Corresponding Author), Tuomas Poikonen, Erkki Ikonen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)


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 pulse-width 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 RMS currents up to 10 A and 1 A, respectively, and has a selectable transconductance ranging from 100 μS to 10 S. Typical cut-off frequency for the current output is around 10 MHz for various types of LEDs.
Original languageEnglish
Pages (from-to)3704-3710
Number of pages7
JournalIEEE Transactions on Instrumentation and Measurement
Issue number6
Early online date16 Aug 2019
Publication statusPublished - Jun 2020
MoE publication typeA1 Journal article-refereed


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


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