Journal of The Institute of Information and Telecommunication Facilities Engineering (정보통신설비학회논문지)

Korea Institute of Information and Telecommunication Facilities Engineering (한국정보통신설비학회)
권호 표지

Design of Variable Gain Low Noise Amplifier Using PTAT Bandgap Reference Circuit

PTAT 밴드갭 온도보상회로를 적용한 가변 이득 저잡음 증폭기 설계

  • 최혁재 (중앙대학교 전자전기공학부) ;
  • 고재형 (중앙대학교 전자전기공학부) ;
  • 김군태 (중앙대학교 전자전기공학부) ;
  • 이제광 (중앙대학교 전자전기공학부) ;
  • 김형석 (중앙대학교 전자전기공학부)
  • Received : 2010.10.12
  • Accepted : 2010.12.13
  • Published : 2010.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, bandgap reference PTAT(Proportional to Absolute Temperature) circuit and flexible gain control of LNA(Low Noise Amplifier) which is usable in Zigbee system of 2.4GHz band are designed by TSMC $0.18{\mu}m$ CMOS library. PTAT bandgap reference circuit is proposed to minimize the instability of CMOS circuit which may be unstable in temperature changes. This circuit is designed such that output voltage remains within 1.3V even when the temperature varies from $-40^{\circ}C$ to $-50^{\circ}C$ when applied to the gate bias voltage of LNA. In addition, the LNA is designed to be operated on 2.4GHz which is applicable to Zigbee system and able to select gains by changing output impedance using 4 NMOS operated switches. The simulation result shows that achieved gain is 14.3~17.6dB and NF (Noise Figure) 1.008~1.032dB.

Keywords