An all-digital CMOS ambient light sensor using a single photon avalanche diode
| Autor: | Shaan Sengupta, Matthew L. Johnston, Hyunkyu Ouh |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Avalanche diode business.industry 020208 electrical & electronic engineering 010401 analytical chemistry Detector Photodetector 02 engineering and technology 01 natural sciences 0104 chemical sciences Photodiode law.invention Single-photon avalanche diode CMOS law 0202 electrical engineering electronic engineering information engineering Optoelectronics business Sensitivity (electronics) Electronic circuit |
| Zdroj: | 2017 IEEE SENSORS. |
| DOI: | 10.1109/icsens.2017.8234047 |
| Popis: | Ambient light sensors are increasingly used in low-power and portable devices to provide real-time response to changing light conditions, from modulating screen brightness to detecting user proximity. These sensors typically use an array of reverse-biased photodiodes coupled to an analog front-end and digitization circuits. In this work, we present an all-digital ambient light sensor, which leverages the pulse-based output of a CMOS-integrated single-photon avalanche diode (SPAD). Using only simple digital circuits to detect and count pulses minimizes circuit area and power. By limiting light reaching the SPAD using a metal filter structure, the detector operates across a broad ambient light range without saturation. Sensitivity is sufficient to enable sensing from a single SPAD device, resulting in further area savings. Measured performance from a fabricated 130 nm CMOS circuit implementation is provided, demonstrating operation in ambient light from 100–25,000 lux with less than 125 microwatts of active power consumption. |
| Databáze: | OpenAIRE |
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