Photosensor circuit having a level shifting circuit for biasing a first node with an operation voltage signal and a phototransistor for modulating the level of the operation voltage signal

A photosensor circuit including a first node, a level shifting circuit, a phototransistor and an inverter is provided. The first node has an operation voltage signal. The level shifting circuit is coupled to the first node for biasing the first node, so that the operation voltage signal is biased to...

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Bibliographic Details
Main Authors LIU SHOU-EN, YEH YUNG-HUI
Format Patent
LanguageEnglish
Published 25.09.2012
Subjects
BASIC ELECTRIC ELEMENTS
COLORIMETRY
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
PHYSICS
RADIATION PYROMETRY
TESTING
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Summary:A photosensor circuit including a first node, a level shifting circuit, a phototransistor and an inverter is provided. The first node has an operation voltage signal. The level shifting circuit is coupled to the first node for biasing the first node, so that the operation voltage signal is biased to an operation biasing level. The phototransistor is coupled to the first node for receiving an optical signal and accordingly generates a first electrical signal by means of controlling the level of the operation voltage signal. The inverter receives the first electrical signal and accordingly generates and outputs a second electrical signal, which indicates the intensity of the optical signal.
Bibliography:Application Number: US20100712301