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.
|Journal||IEEE Transactions on Instrumentation and Measurement|
|Publication status||E-pub ahead of print - 2019|
|MoE publication type||A1 Journal article-refereed|
- Transconductance amplifier
- light-emitting diode
- pulse-width modulation
- optical metrology