A COMPREHENSIVE SURVEY OF LED DRIVER IC DESIGN TECHNIQUES

The Light-Emitting Diode (LED) driver is an important part of Visible Light Communication (VLC) systems. The main challenge of the VLC LED driver is to offer a high data transmission rate with high power efficiency. This paper presents the various existing design of LED drive incorporating various technologies. These designs support the electrical and optical characterization by using orthogonal frequency division multiplexing (OFDM) signals. A current steering digital to analog converter (DAC) based LED driver circuit supporting 4-channels with an 8-bit resolution in a 0.18 μm complementary metal oxide semiconductor (CMOS) technology. The LED driver used in the pulse current modulator driving technique supplies pulse driving current between 0mA~250mA and operates between 500k-Hz~1M-Hz. LED driver circuit also incorporating digitally-controlled analog circuit blocks to deliver concurrent illumination control and serial data transmission. Conventional LED drivers for High brightness applications consist of switching-type converters which require passive components like high value inductors and electrolytic capacitors for their operation. The future scope is an impedance reduction technique to enhance the bandwidth of the LED driver and a first-order pre-equalizer is utilized to enhance the electron-optical-electron (E/O/E) bandwidth in the VLC system