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학술대회 Payload Power Amplifier with Average Power Tracking in Ka-Band Satellite Downlink
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문성모, 신동환, 염인복, 이문규
Electronic Components and Technology Conference (ECTC) 2015, pp.2054-2059
14MR3100, 차기위성 Flexible 통신방송 탑재체 핵심기술 개발, 안재영
In this paper, a K-band power tracking high power amplifier (HPA) module using a digital potentiometer integrated feedback is proposed. The supply modulator consists of a pulse width modulation (PWM) controller, DC-DC converter and a digital potentiometer integrated feedback loop, and provides dynamic supply voltages to HPA for the optimal efficiency. The digital potentiometer is operated as a voltage-controlled resistor whose resistance is automatically adjusted by a sampled RF input to HPA and consequently changes the feedback voltage that determines a supply voltage. Also, the designed module package using zig based on aluminum for minimizing self-resonance, zig loss characteristic is optimized. The designed HPA module is verified by a PAE better than 17% maintained over 31 dBm output power at 20 GHz at which Ka-band satellite downlink is allocated.
KSP 제안 키워드
Band Power, Controlled resistor, DC-DC Converters, Digital potentiometer, Feedback Loop, Feedback voltage, High power amplifier(HPA), K-band, Loss characteristics, Optimal efficiency, Output power