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Out-Phased Current Combining 방식과 Complex Combining Load 방식을 이용한 3.7∼4.0 GHz 대역 GaN-HEMT Dohert 전력증폭기
최재혁,진일비,김성형,송재성,이윤정,임서균,양영구 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.11
This paper proposes a Doherty power amplifier (DPA) with an extended output power back-off (OBO) using out-phased current combining (OCC) and complex combining load (CCL) methods. When OCC or CCL is applied independently, the output impedance of the carrier amplifier is determined to be a single value. However, when OCC and CCL are applied together, the output impedance of the carrier amplifier can be selected, which provides freedom in the circuit design. The implemented DPA achieves an extended back-off region by expanding the load impedance modulation ratio of the carrier amplifier by five times between the low-power and peak-power levels. The implemented DPA achieves 43.0∼44.3 dBm output power and 8.0∼8.5 dB gain using a CW signal at 3.7∼4.0 GHz. It achieves 72.5∼77.9 % DE at peak power and 41.5∼48.4 % DE at 9 dB OBO. Furthermore, it achieves 8.2∼8.7 dB of gain, 45.6∼50.0 % DE at 9 dB OBO, and an ACLR of −22.0∼−26.6 dBc using a 100 MHz 64-QAM 5G NR modulated signal with a peak-to-average power ratio (PAPR) of 7.8 dB.
발목의 해부학적 회전구조를 구현하고 제어하는 발목재활로봇
김인우(Inwoo Kim),김규진(Gyujin Kim),권경민,장재용(Jeung Jang),임서균(Yim Seo Gyun),조대기(Daeki Cho),이수홍(Soo-Hong Lee),Gapsun Kim 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
When physical ability is reduced due to aging and various diseases, the athletic ability of the ankle, which plays a very important role in walking, is significantly weakened. Various ankle exoskeleton robots have been developed to assist and rehabilitate ankles with reduced mobility, but most do not implement the correct rotation axis of the ankle, making it difficult to transmit the correct force and increase the risk of injury. In this study, the anatomical axis of rotation of the ankle joint was structurally implemented. Two linear actuators were installed in the embodied structure to control the two rotation axes of the robot. By installing a load cell between the linear actuator and the structure, the magnitude of the torque transmitted by the robot to the human can be calculated inverse dynamic. The ankle exoskeleton robot can effectively simulate and support all movements of the human ankle.