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 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 language | English |
|---|---|
| Article number | 8804230 |
| Pages (from-to) | 3704-3710 |
| Number of pages | 7 |
| Journal | IEEE Transactions on Instrumentation and Measurement |
| Volume | 69 |
| Issue number | 6 |
| Early online date | 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