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Design of Variable Gain Low Noise Amplifier with Memory Effects Feedback for 5.2 GHz Band

5.2 GHz 대역에서 동작하는 기억 기능 특성을 갖는 궤환 회로를 이용한 변환 이득 저잡음 증폭기 설계

  • Lee, Won-Tae (Department of Computer and Radio Communication Engineering, Korea University) ;
  • Jeong, Ji-Chai (Department of Computer and Radio Communication Engineering, Korea University)
  • 이원태 (고려대학교 전파통신공학과) ;
  • 정지채 (고려대학교 전파통신공학과)
  • Published : 2010.01.31

Abstract

This paper presents a novel gain control system composed of a feedback circuit, Two stage Low Noise Amplifier (LNA) using 0.18 um CMOS technology for 5.2 GHz. The feedback circuit consists of the seven function blocks: peak detector, comparator, ADC, IVE(Initial Voltage Elimination) circuit, switch, storage, and current controller. We focus on detecting signal and designing storage circuit that store the previous state. The power consumption of the feedback circuit in the system can be reduced without sacrificing the gain by inserting the storage circuit. The adaptive front-end system with the feedback circuit exhibits 11.39~22.74 dB gain, and has excellent noise performance at high gain mode. Variable gain LNA consumes 5.68~6.75 mW from a 1.8 V supply voltage.

Keywords

Feedback;IVE Circuit;ADC;Storage;LNA

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