Digital output silicon optical sensors
FRANCISCO JAVIER DE LA HIDALGA WADE
CARLOS ZUÑIGA ISLAS
Summary or description
For the first time, a detailed description of lowcost newintelligent (or smart) two-terminal optoelectronic devices without any on-chip circuitry for signal processing is presented. The design of the devices is based on the intelligent integration of micro-sized diodes and metal-oxide-semiconductor (MOS) capacitors. By combining physical processes and a functional voltage bias, such optical sensors transform the received analog input nonmodulated optical signal directly into a pulse-width modulated electrical signal; the duty of the signal depends on the irradiation level, and the whole process is conducted without any integrated or external analog-to-digital converter. When the optical sensors operate under a pulsed irradiation synchronized with the functional voltage bias, unconventional logic properties are obtained that can be used to identify the emission from two equal LEDs.
Malik, O., et al., (2008). Digital output silicon optical sensors, Sensors and Actuators A (142): 196–202
Repositorio Institucional del INAOE