Design and Fabrication of a UHF Frequency Synthesizer

• Main Authors: Chuang,Chao-Bao, 莊朝寶
• Other Authors: Chang,Yuh-Huu
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/50172102048721706296

碩士 === 中原大學 === 電子工程學系 === 82 === In RF circuit design, the stable frequency source is usually generated by crystal oscillator. THe crystal oscillator is a stable frequency source, but it can generate a limited number frequencies, and the frequencies can be modified in small region only. Most wireless equipments need many stable frequency sources. For instance, a SSB transceiver require 280,000 frequencies of signals with 100Hz frequency seperation between 2 -30MHz region. The Phase-Locked Loop (PLL) techniques can be applied to generate those stable and precise frequencies. In this thesis, we study the frequency synthesizer and reaize a hardware whose frequency band are in the region of 300-400MHz, and the frequency seperation is 10KHz. The total number of frequencies is 10,000. The frequency synthesizer consists of a quicker PLL and a circuit divider. The ICs are used in the fabrication, then the complication of the frequency synthesizer circuit design is greatly redused. The measurements of the parameters of the frequency synthesizer are compared with the theoretical values, we also discuss the differences and indicate the way how to improve the performance.