The Design and Implementation of a Multi-band Down-Converter for WLAN/WiMAX Applications

• Main Authors: Chih-Yuan Kao, 高稚淵
• Other Authors: 楊正任
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/81220811183160409056

碩士 === 元智大學 === 通訊工程學系 === 96 === This thesis presents the implementation of a multi-band down-converter at WLAN 802.11a/b/g(2.4/5.2GHz) and WiMAX 802.16d(3.5GHz) systems. It’s aimed for low operating voltage、low power consumption and reducing area at the same chip. The circuits completed with fully integrated by TSMC 0.18μm 1P6M CMOS process. The concurrent multi-band LNA employs the shunt-peaking to reduce the number of components. The measured gain of this circuit are 8.87dB、10.40dB and 8.41dB at the frequency 2.4GHz、3.5GHz and 5.2GHz respectively. The measured NF of this circuit are 4.15dB、4.47dB and 4.90dB respectively. The total power consumption is 13.4mW, chip area included pad is 0.76mm2. We propose a modified construction of Micro-mixer to improve the linearity and reduce the number of resistor on the chip. The P1dB is -14.1dBm and the IIP3 is -3dBm at the frequency of 3.5GHz for WiMAX application. Besides, the power consumption of mixer-core is only 1.27mW, chip size is 0.43mm2. For switched multi-band VCO, we used capacitive coupling to control the bias current at different frequency band(2.393、3.457 and 5.085GHz). The corresponding phase noise are -119.2dBc/Hz@1MHz、-119.8dBc/Hz@ 1MHz and -118.2dBc/Hz@1MHz respectively. The chip size is 0.49mm2.