An Energy Efficient High-speed Digital LED Driver for Visible Light Communications

Aravind Venugopalan Jalajakumari Nair, Katherine Cameron, Dobroslav Tsonev, Harald Haas, Robert Henderson

Research output: Contribution to conferencePaperpeer-review

Abstract / Description of output

In this paper an energy efficient light emitting diode (LED) driver circuit for visible light communications (VLC) and results from the electrical and optical characterization are presented. A current steering digital to analogue converter (DAC) based LED driver circuit supporting 4-channels with an 8-bit resolution is realized in a 0.18 μm complimentary metal oxide semiconductor (CMOS) technology. Each channel delivers a full-scale current of 255 mA and achieves up to 67% electrical efficiency when driving 250 MS/s orthogonal frequency division multiplexing (OFDM) signals. Optical differential drive capability is demonstrated by using two output branches of a single channel to drive two different LEDs with an SNR improvement (>5 dB). The chip is also capable of full digital control of color shift keying (CSK) using multi-color LEDs enabling lighting color-temperature adjustment, dimming and multiple-input and multiple-output (MIMO) optical communications and these aspects will be the subject of future research. Keywords
Original languageEnglish
Number of pages6
Publication statusPublished - 8 Jun 2015
Event2015 IEEE International Conference on Communications (ICC) - London, United Kingdom
Duration: 8 Jun 201512 Jun 2015


Conference2015 IEEE International Conference on Communications (ICC)
Country/TerritoryUnited Kingdom


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