Dual-power-mode quasi-doherty RF CMOS power amplifiers for mobile communications = 모바일 통신용 이중파워모드 준도허티 RF CMOS 전력 증폭기

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dc.contributor.advisorHong, Songcheol-
dc.contributor.authorKim, Ki Chul-
dc.description학위논문(박사) - 한국과학기술원 : 전기및전자공학부, 2016.8,[iii, 84 p. :]-
dc.description.abstractDual-power-mode (DPM) quasi-Doherty RF CMOS power amplifiers (PAs) for mobile communications are presented. Considering probability density function, to achieve long battery life-time in a mobile phone, two architectures for the DPM PA are proposed using SOI LDMOS and (SOI) CMOS processes, respectively. Firstly, in the SOI LDMOS PA, second harmonics are controlled through the path of low power mode (LPM) for high pow-er mode (HPM) PA’s linearity. In addition, a capacitor added switch is proposed to increase its voltage standing capability, which is used at the output matching network for a mode control. A combined cascode structure of CMOS and LDMOS devices for the LPM is pro-posed to complement two devices’ drawbacks. Secondly, in the DPM CMOS PA, a trans-former-based quasi-Doherty PA (QDPA) is designed for the HPM. In the QDPA, a folded combining transformer is proposed for three advantages: reduced chip area, improved inser-tion loss, and increased bandwidth. Furthermore, an adaptive power divider is proposed for adjustable power dividing according to the incoming power in the input of the QDPA. In the LPM, only main power cell in the QDPA turns on. Its cell-size in the common gate transistor is controlled using an adaptive power cell (APC) technique, which is used for a PA’s linearity improvement in the HPM.-
dc.subjectadaptive power divider▼aCMOS▼acombined cascode▼adual power mode▼afolded combining transformer▼amobile communication▼apower amplifier▼asecond harmonic control▼aSOI CMOS▼aSOI LDMOS▼atransformer-based quasi-Doherty-
dc.subjectACLR▼aCMOS▼aEVM▼aFolded combining transformer▼aLDMOS▼aLTE▼a이동통신▼a이중 파워 모드▼a전력증폭기▼a적응형 전력 전달 회로▼a트랜스포머 기반 준도허티-
dc.titleDual-power-mode quasi-doherty RF CMOS power amplifiers for mobile communications = 모바일 통신용 이중파워모드 준도허티 RF CMOS 전력 증폭기-
dc.description.department한국과학기술원 :전기및전자공학부,-
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