The Design and Implementation of the Low Noise RF front-end Circuit

• Main Authors: Jia-Ming Wu, 吳佳明
• Other Authors: Hung-Wei Chiu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/7dd522

碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 96 === Wireless communication system has been developed for many years. Abundant literature has been investigated due to application requirements, so we researched PLL and wideband LNA in this paper. The PLL is often used in communication system. PLL output spectrum includes master signal and unnecessary spur existence, because the architecture of PLL has non-ideal effect. For suppress spur probably improve characteristic of internal circuit. In this paper we will improve from system architecture, add delay control circuit of analog type in traditional PLL. The proposed method can be reduced spur about 5dB. In terms of wideband LNA design, noise problem is important obviously in high frequency when material device reach limit. So mostly use inductance and capacitance resonance to reduce noise, but will increase cost and area. We will propose feedback method to increase bandwidth, and also canceling self-device noise improved NF.