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A Bandgap-Referenced Current-Mode VCSEL Driver in CMOS for Short-Range LiDAR Sensors
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DOI：10.3390/electronics15163578.png)
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Abstract
En 中文
This paper presents a bandgap-referenced current-mode vertical-cavity surface-emitting laser (VCSEL) driver for short-range light detection and ranging (LiDAR) sensor applications. To improve current stability under process, voltage, and temperature (PVT) variations, the proposed driver employs a bandgap-referenced bias generation scheme combined with a current-mode modulation architecture. The driver was implemented in a 0.18 µm CMOS process and occupies a compact core area of 350 × 100 µm2. Post-layout simulation results show that the proposed circuit maintains a bias current of approximately 2 mA and a modulation current of approximately 10 mA across PVT corners. The fabricated chip was measured using a 50 Ω termination, and the measured output voltage swing was approximately 495 mVpp, corresponding to a modulation current of 9.9 mApp. Hence, the proposed current-mode VCSEL driver provides a potential solution as a compact, low-power, stable LiDAR sensor transmitter.
Keywords:
BGR
CMOS
current-mode
LiDAR
VCSEL
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