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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Novel RF Active Bandpass Filter with Low Noise Performance

저잡음 특성을 갖는 새로운 RF 능동 대역통과 여파기

  • Published : 2002.09.01
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Abstract

In this paper, a new topology of a active capacitor is proposed in order to apply the resonator in the design of RF active bandpass filters. Through the noise analysis of the active capacitor, the optimized low noise design process is also presented, Due to the low noise performance of the proposed active bandpass filter, it can be used in the RF front-end of the receivers. In designed 2-stage active bandpass filter at 1.9 GHz shows insertion loss of 0 dB, noise figure of 2.6 dB, and OIP3 of 8 dBm.

본 논문은 저잡음 특성을 갖는 구조의 부성저항을 이용하여 공진부의 손실을 보상하는 새로운 구조의 공진회로를 제안하고 있다. 또한 여파기 설계시, noise해석을 통하여 최적의 noise 특성을 갖도록 능동 대역통과 여파기의 설계방법을 제시하고 있다. FET에 의해 만들어진 능동 커패시터는 부성저항과 커패시턴스 성분을 가지고 있으며, 부성저항에 의해 공진회로를 구성하는 인덕터 소자의 손실을 보상해 준다. 기존의 능동 여파기는 대개 높은 잡음지수를 가지는데 반하여 제안된 능동 여파기는 능동소자의 잡음특성을 최소화하는 구조로 설계되었다. 잡음지수를 최소화함으로서 RFIC나 MMIC와 같은 집적회로로서 수신단 Front-end설계에 응용할 수 있다. 제작된 2단 능동대역통과 여파기는 1.9 GHz 대역에서 설계되었으며, 측정된 삽입손실은 0 dB, 잡음지수는 2.6 dB, 그리고 OIP3는 8 dBm의 특성을 얻었다

Keywords

References

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