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In this paper, the design of a programmable mixed-signal electronic circuit to control the light output of a red-green-blue (RGB) light emitting diode (LED) to be used in an optical fiber sensor system is presented and discussed. The LED is to be used as a light transmitter (light source) within the sensor system. The output of each LED color is to be independently controlled using either a d.c. current or a pulse width modulation (PWM) encoded current. The idea for, and architecture of, the mixed-signal electronic circuit design is considered as both a discrete implementation using off-the-shelf components and the concept for an application specific integrated circuit (ASIC) solution using a 0.35 µm complementary metal oxide semiconductor (CMOS) fabrication process. In this paper, the design operation principles, circuit architecture, simulation results and hardware requirements for this LED driver circuit are considered.
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com/books/fiber-optic-sensors/intrinsic-optical-fiber-sensor, April 24, 2017.
 Domingos M. C. Rodrigues, Fabio V. B. de Nazare and Marcelo M. Werneck, “Enhanced
Plastic Optical Fiber Sensor for Refractometry Based on Amplitude Modulation", Proceedings of the IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2014, pp. 1612-1616, DOI:10.1109/I2MTC.2014.6861018.
 Kingbright RGB LED. Internet: https://www.farnell.com/datasheets/2046599.pdf?_ga=1.2955312.1236932112.1493023205,
April 24, 2017.
 A. Vallan, M. L. Casalicchio, A. Penna and G.Perrone, “An intensity based fiber accelerometer," Proceedings of the 2012 IEEE International Instrumentation and Measurement Technology Conference, 2012, pp. 1078-1082, DOI:10.1109/I2MTC.2012.6229126.
 E. Lewis, \Monitoring of environmentally hazardous exhaust emissions from cars using optical fiber sensors," Proceedings of the 14th OptoElectronics and Communications Conference (OECC2009), Hong Kong, pp.1-3, 2009.
 K. Fidanboylu and H. Efendiolu, “Fiber Optic Sensors and their Applications," Proceedings of the 5th International Advanced Technologies Symposium (IATS'09), 2009, Karabuk, Turkey, pp1-6
 Lucia Bilro, Nelia Alberto, Joao L. Pinto and Rogerio Nogueira, Optical Sensors Based on Plastic Fibers, Sensors - Open Access Journal, Sensors 2012, 12, 12184-12207; doi:10.3390/s120912184. Internet: https://www.mdpi.com/1424-8220/12/9/12184, April 24,
 S. Deng, W. Doherty, M. A. McAuliffe, U. Salaj Kosla, L. Lewis, and G. Huyet, “A lowcost, portable optical sensing system with wireless communication compatible of real-time and remote detection of dissolved ammonia," Photonic Sensors, vol. 6, pp. 107-114, 2016.
 Marian Rabe et al., “Mode filter for LED-based absorption spectroscopy," Proceedings of the 2016 IEEE International Instrumentation and Measurement Technology Conference, 2016, pp.1-5, DOI: 10.1109/I2MTC.2016.7520591.
 U. Timm, E. Lewis, D. McGrath, J. Kraitl and H. Ewald, “LED Based Sensor System for Non-Invasive Measurement of the Hemoglobin Concentration in Human Blood," Proceedings of the 13th International Conference on Biomedical Engineering (ICBME 2008), Singapore, pp.825-828, 2008.
 D.M.C. Rodrigues, F.V.B. de Nazare, and M.M.Werneck, \Enhanced plastic optical fiber sensor for refractometry based on amplitude modulation," Proceedings of the IEEE International
Instrumentation and Measurement Technology Conference (I2MTC), pp. 1612-1616, 2014.
 IEEE, IEEE 1076-2008 - IEEE Standard VHDL Language Reference Manual. Internet:
https://ieeexplore.ieee.org/xpl/login.jsp?tp=\&arnumber=893288\&url=http\%3A\%2F\%2Fieeexplore.ieee.org\%2Fiel5\%2F7180\%2F19335\%2F00893288, April 24,2017.
 Xilinx, CoolRunner-II Evaluation Board Reference Manual. Internet: https://www.xilinx.com/support/documentation/boards_and_kits/ug501.pdf, April 24, 2017.
 Linear Technology, LTSPICE. Internet: https://www.linear.com/designtools/software/,April 24, 2017.
 Europractice IC Service, Austriamicrosys-tems 0.35 µm CMOS (C35). Internet:https://www.europractice-ic.com/docs/austria_datasheets/035umCMOS_C35_2.pdf,April 24, 2017.
 Digilent Inc., “Coolrunner-II Starter Board".Internet: https://reference.digilentinc.com/coolrunner-ii/coolrunner-ii/ref_manual, [April 23, 2017]
 Arduino, \Arduino UNO and Genuino UNO,"Internet: https://www.arduino.cc/en/Main/
 Texas Instruments, “TLC5940 16-Channel LEDDriver With DOT Correction and Grayscale
PWM Control," datasheet. Internet: https://www.ti.com/lit/ds/symlink/tlc5940.pdf,April 24, 2017.
 ON Semiconductor, “CAT4101 1 A Constant-Current LED Driver with PWM Dimming," datasheet. Internet: https://www.onsemi.com/pub/Collateral/CAT4101-D.PDF, April 24,2017.