Programmable logic based current control of light emitting diodes using sigma-delta modulation
- Resource Type
- Conference
- Authors
- Grout, Ian; Ong, Yong Sheng; Lewis, Elfed; Mohammed, Waleed
- Source
- 2017 14th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2017 14th International Conference on. :91-94 Jun, 2017
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Fields, Waves and Electromagnetics
Robotics and Control Systems
Signal Processing and Analysis
Sigma-delta modulation
Light emitting diodes
Optical fiber sensors
Mathematical model
Low pass filters
Frequency modulation
waveform generation
light emitting diode
optical fiber sensor
- Language
In this paper, the design and operation of a sigma-delta modulation based signal generator for the creation of signal waveforms to be used in current mode control of light emitting diodes (LEDs) is presented. The LED is to be used as the light source within an optical fiber sensor (OFS) system and is to be driven with known current waveforms for use within the system. In this paper, the use of pulse density modulation (PDM) is considered and waveforms are generated using a MATLAB/Simulink model of the analog waveform to encode along with a model of the sigma-delta modulator used. The output from the MATLAB/Simulink model is a sigma-delta encoded bit stream along with a VHDL design description that implements the signal in digital memory that can be synthesized into logic to target a suitable programmable logic device (PLD).