| Summary: | 碩士 === 國立臺北科技大學 === 電腦通訊與控制研究所 === 91 === Recently, the technologies of wireless communication are applied extensively to such as GSM, GPRS, Bluetooth, and WLAN. Therefore, WLAN becomes an important solution to the development of internet, and then has gradually become essential to life and create another rise for the opportunity of commerce.
The main purpose of this thesis is to adopt the double balance Gilbert cell mixer, proving better conversion gain, even order harmonics elimination and isolation enhancement of LO port to RF port. Furthermore, a low noise amplifier incorporating a notch filter is a promising method for cost reduction since the traditional image reject filter is not used in the receiving path. As previous method, a mixer and a low noise amplifier incorporating a notch filter constitute the receiver front-end circuit of super heterodyne architecture.
The proposed double balance Gilbert cell mixer is fabricated with TSMC CMOS 0.18um 1P6M process. While RF is set to 2.44GHz, LO 2.04GHz, and IF 400MHz, the simulation results show 5.1dB conversion gain, 4.7dB noise figure, -5dBm IIP3, and -14.2 dBm P-1dB in the 400MHz band. The supply voltage of proposed mixer is 1.8V with the total power consumption of 38mW. In addition, the simulation results of receiver front-end circuit show 21.1dB conversion gain and 2.8dB noise figure.
The chip area occupied by proposed the receiver front-end circuit is 0.95´0.98 mm2.
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