The integration of photodetectors with IC circuits provides a significant
improvement over conventional designs. Featuring noise reduction, extended frequency
responses, lower power consumption, and data operations, these integrated devices open
challenging opportunities for many applications. One type of photodetector has the
potential for important applications in the life science and remote sensing fields -- a
photodetecting device that detects modulated light while rejecting ambient light. A circuit
that can reject very bright ambient light yet provide high AC gain for the best signal-to-noise
ratio was simulated, constructed and tested by discrete components, and excellent
results were obtained. Using 80 klux tungsten light, this device detected an 0.08 lux light
signal modulated at 16 kHz, rejecting more than 120 dB of DC light. This circuit was
demonstrated by application to a plant physiology study, and the results were also
significant. Based on a 1.2 ��m n-well CMOS process, a monolithic device that rejects DC
light was designed and simulated by using HSPICE and the SWITCAP2 programs. It was
found that a rejection of about 112 dB of DC light may be realized by the CMOS
monolithic device. A structure extending this sensor to an imaging device that rejects DC
ambient light is also proposed. / Graduation date: 1997
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/34086 |
| Date | 21 February 1997 |
| Creators | Li, Ning |
| Contributors | Allstot, David J. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
Page generated in 0.0016 seconds