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Miniature and highly sensitive proximity infrared sensor
Authors
	Beklemishev D.N.
	Pereverzev A.L.
	Yanin V.I.
Date of publication
	2016
Abstract
	The article considers the issue of creating miniature and simultaneously highly sensitive proximity infrared sensor. Such sensors are based on semiconductor lasers and photodiodes and are using impulse laser location principle. Signal from photodiode contains AC and DC components. AC component is much smaller then DC, which must be removed. Besides, signal rise time, frequency range and sensitivity of sensor depend on one another. This creates the large issue for miniature proximity sensor designer. This highly sensitive circuits are based on operational amplifiers because their integrated realization and parameter stability. The article gives comparative analysis of two main OA-circuits: well-known AC-circuit and direct current-to-voltage converter – TIA-circuit with active DC-current rejection. Both circuits were created based on required sensitivity of 150 nW. The second approach allows building of highly sensitive circuit with lower noise level and lower signal rise time even with large-area photodiodes. The comparative analysis, simulation and prototyping of two types of amplifier- converters circuits were made: two-stage AC-circuit and transimpedance circuit with active backlight suppression. Moreover, this article gives the further processing ways of the information signal in such system: analog form comparison with a constant threshold, comparison in analog form with a floating threshold and completely digitally processing using high-speed ADCs.
Keywords
	miniature optical proximity sensor, high sensitive circuits, large area IR-detector, DC-current rejection
Library reference
	Beklemishev D.N., Pereverzev A.L., Yanin V.I. Miniature and highly sensitive proximity infrared sensor // Problems of Perspective Micro- and Nanoelectronic Systems Development - 2016. Proceedings / edited by A. Stempkovsky, Moscow, IPPM RAS, 2016. Part 4. P. 107-111.
URL of paper
	http://www.mes-conference.ru/data/year2016/pdf/D145.pdf