Design of a 1.25Gb/s burst mode optical receiver by AC-coupled architecture for ethernet PON system

Abstract

In this thesis, a 1.25Gb/s ac-coupled burst mode optical receiver that can be applied in the Ethernet Passive Optical Network (PON) system, is designed by AC-coupled architecture. The designed receiver has the features of automatically controllable preamplifier and temperature independent bias circuit etc. Most of all, the important function of the receiver is that it operates by ac-coupled architecture as a burst mode receiver with a small coupling capacitor. Without two disadvantages of conventional DC-coupled receiver, which are the offset and reset, as a burst mode receiver, the designed receiver has a guard time meeting EPON standard with special code and wide dynamic range of 21dB. Optical line termination (OLT)) receiver designed by using 0.35$\mum$ CMOS technology meets the standard of This thesis describes a design of CMOS RF front-end receiver for the MB-OFDM UWB receiver, which can provide up 480 Mbps data-rate in short range. In the thesis, the fundamentals of the design of RF circuits are introduced, and design techniques of wideband amplifier are intensively presented. Also, we will introduce the mixer design based on conventional design technique. First, wide simultaneous noise and input matching technique is introduced. With 3~5 GHz wide band noise matching can lead to improve the noise performance compare to previous arts. The noise figure of proposed 3~5 GHz SNIM LNA shows sufficient input matching, enough gain and constant low noise performance. Decreased noise performance, due to the low quality factor of on-chip inductor, can be solved by recent technology including thick top metal on-chip inductor. Proposed SNIM LNA is implemented by TSMC 0.18$\mum$ and IBM 0.13$\mum$ foundry for comparing on-chip inductor effect. In 0.18$\mum$ case, the measurement NF, 3.5~4.5dB, is similar with simulation result. In 0.13$\mum$ case, simulation result with on-chip inductor shows 1.5~2.2dB noise performance which is strongly low enough. The power...