High efficiency capacitor-less parallel combined envelope modulator with dual Class D amplifiers for LTE PA = LTE PA를 위한 두 개의 Class D 증폭기를 가지는 고효율 capacitor-less 병렬연결형 Envelope modulator

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A newly proposed envelope modulator (EM) which has three outstanding features is presented to increase the efficiency of an RF power amplifier. There are three bottlenecks to design the EM. One is the boosting capability which drives the voltage larger than the battery voltage. Another is a wide bandwidth property that can follow a high frequency envelope signal. The other is that the EM should have a high efficiency property while satisfies the above properties. In order to supply an output voltage higher than the input voltage while providing low-frequency power in the EM, a low frequency converter (LFC) is designed as a single-inductor dual-output (SIDO) converter. Thanks to the SIDO converter, the EM does not require an additional boost converter. In addition, a high-frequency converter (HFC) with a wide bandwidth capability is also proposed. The proposed compensation method is called as an average current assisted (ACA) compensation method. These two converters, the SIDO converter and the HFC, are combined in parallel without an AC coupling capacitor by employing a low- frequency current balancing (LFCB) technique. The chip is imple-mented in a 0.18μm CMOS process and achieves 86.5% peak efficiency while tracking a 10MHz Long Term Evolution (LTE) envelope signal.
Advisors
Cho, Gyu-Hyeongresearcher조규형researcher
Description
한국과학기술원 :전기및전자공학부,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학부, 2016.2 ,[ii, 44 p. :]

Keywords

Envelope Modulator; Single-Inductor Dual-Output (SIDO); High-Frequency Converter; Low-Frequency Current Balancing (LFCB) technique; 10MHz LTE; 포락선 변조기; 단일 inductor 이중 출력 converter; 고주파 converter; 저주파 전류 balancing 기술

URI
http://hdl.handle.net/10203/222362
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=648247&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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