Abstract
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 language | English |
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Pages (from-to) | 3704-3710 |
Number of pages | 7 |
Journal | IEEE Transactions on Instrumentation and Measurement |
Volume | 69 |
Issue number | 6 |
Early online date | 16 Aug 2019 |
DOIs | |
Publication status | Published - Jun 2020 |
MoE publication type | A1 Journal article-refereed |
Keywords
- transconductance amplifier
- light-emitting diode
- pulse-width modulation
- optical metrology