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F. J. De la Hidalga-W. ;Journal of Applied Research and Technology 2013, 11 (1)

Autor: O. Malik

Fuente: http://www.redalyc.org/


Introducción



Journal of Applied Research and Technology ISSN: 1665-6423 jart@aleph.cinstrum.unam.mx Centro de Ciencias Aplicadas y Desarrollo Tecnológico México Malik, O.; De la Hidalga-W., F.
J. Semiconductor Light-Controlled Instrument Transducer with Direct PWM Output for Automatic Control Systems Journal of Applied Research and Technology, vol.
11, núm.
1, febrero, 2013, pp.
18-25 Centro de Ciencias Aplicadas y Desarrollo Tecnológico Distrito Federal, México Available in: http:--www.redalyc.org-articulo.oa?id=47426212002 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative Semiconductor Light-Controlled Instrument Transducer with Direct PWM Output for Automatic Control Systems O.
Malik*, F.
J.
De la Hidalga-W. Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE) Departamento de Electrónica Puebla, México *amalik@inaoep.mx ABSTRACT This work shows that the direct PWM output electric signal, with a duty cycle controlled by light intensity, can be obtained using a circuit containing a saw-tooth voltage generator connected in series with a dc voltage source and a metal (semitransparent gate) oxide semiconductor capacitor (MOS-C). The internal PWM signal conversion occurs by the use of non-equilibrium physical processes in the semiconductor substrate of the MOS-C.
The 10-20 V amplitude limited square PWM output signal is obtained by the amplification of the sensor signal with a standard 60 dB transimpedance amplifier.
The amplified output signal presents positive and negative PWM waveforms that can be easily separated using diodes.
The duty of the positive part is proportional to the light intensity, whereas the negative part is inversely proportional to the intensity.
The frequency operating range of this proposed instrument...





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