Design of Fractional Frequency Synthesizer for IEEE 802.11b and WiMAX Transceivers

• Main Authors: Shi-Jie Chen, 陳世捷
• Other Authors: Meng-Lieh Sheu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/09065080831976184712

碩士 === 國立暨南國際大學 === 電機工程學系 === 97 === In recent years, Wireless communication has become the most popular research topic, and the one of the most noticeable methods is WiMAX（Worldwide Interoperability for Microwave Access）. IEEE 802.16-2005（it used to be 802.16e or Mobile WiMAX，this part is most widely used in the recent years）. In this thesis, we present a fractional synthesizer for 802.11b and WiMAX transceivers. The TSPC structure frequency divider cell we adopted here can substantially reduce the power consumption, and minimal size switch is used in the cell to avoid non-ideal effect of MOS switch and to achieve lower chip size and lower power consumption. A fractional frequency synthesizer is implemented with TSMC 0.18μm Mixed-Signal 1P6M CMOS technology provided by Chip Implementation Center. Including the PFD,charge pump,low pass filter,VCO and programmable divider, the chip area is 433μm × 346μm. The chip works at 1.8V (VCO 1.2V) power supply and the input operates at 20MHz/11MHz clock rate. The divider modulus range is from 128 to 255 by fractional. The overall power consumption is less than 21.9mW.