Integrated Circuits Design And Verification For FTTH Transmitter And Receiver Module

With the rapid improvment of information technology, FTTH (Fiber to the home) becomes the hot point in communication area. The purpose of the paper is to bring forward a design project to construct an integrated circuit system for FTTH Transmite/Receive Module.At first, the basic concept and application background of FTTH are introduced. After detailed comparation and analysis, EPON (Ethernet over Passive Optical Network) FTTH protocol is choosed for the FTTH Transmite/Receive Module.Characters of many kinds of FTTH Transmite/Receive Module products are analysed. A new burst mode EPON FTTH system structure and circuit implemention are introduced later. It is shown that the proposed system architecture may overcome the shortcomings of the present products. The burst mode EPON FTTH system features CDR (Clock and Data Recovery) with both OLT and ONT sides, and does not need any servo signals, which may greatly simplfy the FTTH system design.The first stage of the proposed system architecture receive side is transimpedance amplifier (TIA). Basic parameters of TIA are analysed in this thesis, upon which a system structure and circuit implemention of burst mode TIA are then researched and proposed with detailed diagram. All circuits in the TIA system are also analysed in detail. Simulations for both continue mode and burst mode show that the proposed TIA fulfills the design requirements.In order to transform the weak voltage signal to stable value, a system structure and circuit implemention of limiting amplifier (LA) with signal detection are also proposed. The system structure may disable the output port when the input signal level is not high enough, preventing the output from noise. All circuits in the transimpedance amplifier system are also analysed in detail. Simulation results show that the proposed LA fulfills the design requirements.For the transmit side of the proposed system architecture, basic conception of laser diode driver (LDD) is studied and a system structure and circuit implemention of LDD are introduced afterwords. The LDD system is with auto laser power control loop and temperature conpendsate. Each variables for control can be set by consumer. All circuits in the LDD system are also analysed in detail. Simulation result shows that the proposed LDD fulfills the design requirements.A CDR system and circuit that needn't reference clock and servo signals are also proposed. When the system is in burst mode, so long as the loop is locked, the locked frequency value is saved in LPF (Low Pass Filter) of PLL (Phase Lock Loop). A self-balanced CP (Charge pump) introduced in this thesis takes the adventage of charge balance, generates bias current by itself, overcome the mismatch of CP, and finally gains a nearly zero phase error. Simulation results show that the proposed CDR system meets the design requirements.Characters of both CMOS and BiCMOS process for IC (Integrated circuit) fabrication are investigatd in this thesis. Layout and ESD (Electrostatic Discharge) design of each IC for the proposed FTTH T/R Module are also introduced in this thesis. The system level verification shows that the EPON FTTH transmitter and receiver module formed by proposed IC meets the design requirements.