WLL 기지국용 다운 컨버터 설계 = Design of the Down Converter for the WLL Base-station

다국어 초록 (Multilingual Abstract)

In this paper, A down converter to convert RF signal into IF signal is designed at the WLL base-station. It consists of low noise amplifier module and down mixer module. The low noise amplifier module is composed of three-stage and a feedback circuit is added in the first-stage low noise amplifier in order to obtain unconditional stability and good flatness. The configuration of the down mixer module is a single-ended type gate mixer. For the good isolation characteristic of each port, a bandpass filter and a lowpass filter are inserted in the input and output port. To design the down converter without the IF power amplifier, it is important to maximize conversion gain. So the down converter of this paper is designed for the purpose of obtaining a high conversion gain. From the results, the IF output power is -12.68dBm when the LO and the RF power level are 7dBm and -80dBm, respectively. Also when the LO power level is 7dBm, P1dB is -0.19dBm, and the RF input power range shows 70dB on wide operating range.

목차 (Table of Contents)

• Ⅰ.서론
• Ⅱ.WLL 기지국용 다운 컨버터 구조 및 기능
• Ⅲ.저잡음 증폭모듈 설계
• 3.1.저잡음 증폭기의 설계이론
• 3.2.저잡음 증폭기 설계 및 결과
• Ⅳ.다운 믹서모듈 설계
• 4.1.다운 믹서의 원리
• 4.2.다운 믹서 설계
• 4.3.다운 믹서 시뮬레이션 결과 및 분석
• Ⅴ.WLL 기지국용 다운 컨버터 설계결과 및 분석
• Ⅵ.결론