본 논문은 캐리어 주파수가 240 GHz인 THz 대역 송수신기에 있어서, 서브하모닉 믹서의 LO 주파수로 사용되는 120 GHz 국부발진기의 설계 및 제작에 관한 것이다. 120 GHz 국부발진기는 40 GHz PLL(Phase Locked Loop), 40 GHz 대역통과필터(Band Pass Filter), 3 체배기(frequency tripler), 120 GHz 대역통과필터로 구성되어 있으며, 3 체배기는 상용품을 이용하였다. 40 GHz PLL의 위상잡음은 100 kHz offset 주파수에서 -105 dBc/Hz의 성능을 보였고, 120 GHz의 대역통과필터의 중심주파수 119 GHz, 대역폭 5 GHz 일 때 삽입손실은 1.3 dB로 측정되었다. 제작된 120 GHz 국부발진기의 최종 출력은 6.6 dBm이었다.
KSP Keywords
120 GHz, 5 GHz, Band-Pass Filter(BPF), Frequency tripler, phase-locked loop(PLL)
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