The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Low Noise RFIC VCO Based on InGaP/GaAs HBT for WLAN Applications

InGaP/GaAs HBT를 이용한 WLAM용 Low Noise RFIC VCO

  • Published : 2004.02.01
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Abstract

This paper presents a fully integrated 5 GHz band low phase noise LC tank VCO. The implemented VCO is tuned by integrated PN diodes and tuning rage is 5.01∼5.30 GHz with 0∼3 V control voltage. For improved phase noise performance, a LC filtering technique is adapted. The measured phase noise is -87.8 dBc/Hz at 100 kHz offset frequency and -111.4 dBc/Hz at 1 MHz offset frequency which is excellent performance. Moreover phase noise is improved by 5 dB after employing the LC filter. It is the first experimental result in field of InGaP/GaAs HBT VCOs. The figure of merit of the fabricated VCO with LC filter is -172.1 dBc/Hz. It is the best result among 5 GHz InGaP HBT VCOs. Moreover this work shows lower DC power consumption, higher output power and more fixed output power compared with previous 4, 5 GHz band InGaP HBT VCOs.

본 논문은 5 GHz 대역의 저위상잡음 특성을 갖는 모두 집적화된 LC Tank 전압제어 발진기를 설계 제작하였다. 제작된 전압제어발진기는 PN 다이오드를 사용하여 튜닝되며, 제어 전압 0∼3 V 하에서 튜닝 범위는 5.01∼5.30 GHz의 290 MHz 튜닝 범위를 가진다. 우수한 위상 잡음 특성을 얻기 위해 LC 필터링 기법을 이용하여 전류 전원 트랜지스터의 열잡음의 상향 변환을 막았다. 측정 결과 위상잡음은 -87.8 dBc/Hz＠100 kHz offset, -111.4 dBc/Hz＠1 MHz offset의 우수한 특성을 보였다. 또한 LC 필터로 인해 약 5 dB의 위상잡음 특성이 개선됨을 알 수 있었으며, 이는 HBT 공정을 이용한 최초의 실험적 결과이다. 제작된 전압제어 발진기의 FOM은 -172.1 dBc/Hz이며, 이는 5 GHz 대역의 InGaP HBT VCO 중 최고의 성능이다. 또한 본 논문에서 제안한 발진기는 기존의 InGaP HBT를 이용한 VCO에 비해 더 낮은 DC 전력을 소모하며, 더 높고 평탄한 출력 전력 특성을 보였다.

Keywords

References

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