Transconductance amplifier for optical metrology applications of light-emitting diodes

Research output: Contribution to journalArticle


Research units

  • VTT MIKES Metrology


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
JournalIEEE Transactions on Instrumentation and Measurement
Publication statusE-pub ahead of print - 2019
MoE publication typeA1 Journal article-refereed

    Research areas

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

ID: 36266662