Research And Fabrication Of High Speed Optical Receiver Analog Front-End In A 0.35μmCMOS Technology

With the rapid development of telecommunication networks, computer networks and Internet, it is urgent to build information super-highway. Optic-fiber communication systems are the principal parts of information super-highway for its merits such as great capacity, long transmit distance, economizing energy source, anti interference and anti radiation etc. Thus, it is very important to design high speed integrated circuits for optical transmission systems with independent property.In the building blocks of an optical transmission system, the pre-amplifier and the main amplifier are the critical parts. The task of this project is to design a preamplifier and a main amplifier for high speed optical receiver using 0.35μm CMOS technology and try to integrate the front-end amplifier monolithically.The performance of a preamplifier has great effect on the performance of an optical receiver. Trans-impedance pre-amplifier are widely used in the high speed optical transmission systems. The bandwidth of the trans-impedance is extended using the inductive peaking technique. The post-simulated results are presented finally with the help of Cadence Spectre software tool.An auto Gain Control (AGC) amplifier or a limiting amplifier is generally used to realize the main amplifier. The latter one was chosen to realize the main amplifier in our design since it has the feature such as simple topology, few external components and fast responsibility. A source coupled pair with regulated cascade and inductive loads is used as the basic wide-band amplification cell to achieve a higher gain-bandwidth product. A power optimization methodology for a multistage wide band amplifier has been proposed. The pre-simulated results are presented finally with the help of Cadence Spectre software tool.The front-end amplifier is integrated monolithically. The pre-simulated results are presented finally with the help of Cadence Spectre software tool.Layout design is an important step in chip design flow and the skills for high-speed layout design are described. Of all, there is a breakthrough in the layout design of the trans-impedance.In this paper, we describe the procedures of design of the chip as follows: circuit design, the layout design and chip fabrication and conceive of test scheme and test system building. The simulated results of the circuits validate our design specification. And the simple test results of the transimpedance preamplifier chip are given.