A CMOS 155Mb/s Optical Wireless Transmitter for Indoor Networks

摘要

A 155Mb/s CMOS LED driver for low-cost optical wireless links is presented. The driver is realized in a 0.7 mum commodity mixed-signal CMOS process from Alcatel Microelectronics. The driver employs switching transistors which drive a current mirror to generate modulation current. The circuit also contains a controllable quiescent current source. The transmitter driver incorporates two novel features: adjustable current peaking and adjustable charge extraction. These function are implemented with the use of original timing generators. Simulations indicate that the design achieves output rise times and fall times of less than 2ns. Other design parameters were selected to suit the requirements of the InP resonant cavity LED that was developed for this application.