Dvb-t Receiver Frequency Synthesizer

The purpose of the thesis is to research the fully integrated frequency synthesizer suitable for terrestrial digital video broadcasting (DVB-T) receiver. First, the thesis introduces the specification of synthesizers for DVB-T and summaries the common analysis methods and structure of synthesizers. Then, the research focuses on the analysis methods for loop parameters design and noise estimation, and the test chip of a narrow band synthesizer was manufactured with TSMC 0.25μm CMOS technology to verify the analysis.In the part of loop parameters design, the influence on loop stability of parameters variations caused by process, voltage and temperature (PVT) etc is quantitively analyzed. Based on the analysis, the method of parameters design with stability optimization is proposed.In the part of noise estimation, the new sampling equivalent noise model for charge pump is proposed, and the block noise estimation based on the loop parameters or the design specification is suggested to estimate the whole loop noise.In the part of circuits design, the practical circuits including innovations are exhaustively discussed. The improving techniques on the differential charge pump are proposed, and the simple stability compensation method is also proposed based on the stability analysis. The fully differential VCO with new switch-varactor is also proposed. The principle and structure for low-noise divider is also theoretically analyzed and concluded.Finally, through the simulation and chip test, the proposed parameter design method based on stability analysis and optimization is verified, and the proposed sampling-equivalent noise model for charge pump and the method for noise estimation is also verified. Additionally, the novel circuits such as differential charge pump and VCO are validated.In general, the thesis discusses the method and complete procedure from system parameter design to circuits design for frequency synthesizers. At the end of the paper, the optimization method for noise optimization is discussed, which is the good reference for further research.