Design, Fabrication and Analysis of Fast Wideband Frequency Synthesizer with Low Spurious and Phase Noise

, M.Sc. Thesis Sharif University of Technology Vahedi, Pouria (Author) ; Banayi, Ali (Supervisor)

Abstract

In this thesis, design and fabrication of wide band frequency synthesizer with low spurious and low phase noise is investigted. It is very important to use an apropriate frequency synthesizer structure which would meet intended properties. In order to reach a low step size and high switching speed, using DDS is recomended; as well as using composition of DDS and PLL in order to meet a low spurious level. The main objective of this thesis is to investigate the best composition of outlet spures; so beside optimization of other properties, the main motivation has been focused on decreasing spures. Moreover, after studying Mechanisms of spures production in DDS outlet, some methods for...

Analysis and System-Level Design of a C-Band Signal Generator with High Spectral Purity

, M.Sc. Thesis Sharif University of Technology Heydari, Hossein (Author) ; Nayebi, Mohammad Mahdi (Supervisor) ; Medi, Ali (Co-Advisor)

Abstract

In this project a high spectral purity C-band (4.25-5GHz) frequency synthesizer has been analyzed and designed and implemented in CMOS 0.18μm technology. This synthesizer has been embedded in TX path of a transceiver module as a frequency translator for digital phased array system applications. The system includes Phase Locked Loops (PLLs) and Direct Digital Frequency Synthesizer (DDFS). Due to desired Low spur level (90 dBc) in C-band, system level design, frequency plan, choosing proper PLL topology and etc. have been considered in details. One of the important challenges in system design is the signal spectrum purity. In other words, the system should produce minimum phase noise. Output...

Design of Low Spur Fast Settling Integer-N Frequency Synthesizer for Bluetooth Application

, M.Sc. Thesis Sharif University of Technology Choopani, Armin (Author) ; Safarian, Amin Ghasem (Supervisor) ; Atarodi, Mojtaba (Supervisor)

Abstract

Frequency synthesizers are one of the most critical building blocks of RF systems. Their task is to produce high-frequency precise and stable clock signals from a low-frequency source. The signal used in mixers to up-convert and down-convert desired signals in transceivers and the precise clock of analog to digital converters are made by frequency synthesizers. Designing frequency synthesizer, because of its lots of parameter and dependency of these parameters to each other, is a hard task which forces designers to propose new structures. In this thesis, an integer-N frequency synthesizer for Bluetooth application, with the goals of decreasing spurious tones power and settling time, is...