Design Of Fiber Transimitter For Digital Audio Interface

Fiber transmitter is a media conversion cell which converts between electrical signal of short distance and optical signal of long distance. It is also called optical electrical converter. Fiber transmitter is widely used in the practical network environment when cable can not cover and fiber is needed to extend transmission distance. So the research on fiber transmitter is important.In this thesis, we first introduced some knowledge about fiber communication, the position where fiber transmitter located, giving an overview of the background of the task and the function of the fiber transmitter. Based on that, the fiber transmitter on the structure and working principle is analyzed. Fiber transmitter mainly consists of the input stage, output stage and a reference module.CSMC 0.6μm CMOS technology is adopted on the design of input stage, output stage and reference module. We made a detailed introduction of the comparator using hysteresis, which was the core circuit of input stage, and paid more attention to the research of the input stage. Simulation results were given to validate the design. Also the theory of the output stage was illuminated and the circuit was simulated. The principle of current mirror and reference source has been introduced. The current reference and voltage reference in the thesis were designed and validated through the simulation results.Finally, this fiber transmitter was simulated and proved by the simulation results. The layout of whole fiber transmitter was designed, layout parasitical parameters were extracted, and the circuit was post-simulated (A light emitted diode is needed externally during application).