Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Hansik Oh"'
Autor:
Sooncheol Bae, Hansik Oh, Woojin Choi, Jaekyung Shin, Yifei Chen, Hyeongjin Jeon, Young Chan Choi, Sunwoo Nam, Soohyun Bin, Yoonjung Lee, Kang-Yoon Lee, Keum Cheol Hwang, Youngoo Yang
Publikováno v:
IEEE Access, Vol 12, Pp 41980-41987 (2024)
This paper presents a Class-E/F3 switching power amplifier (SPA) with reduced second harmonic leakage using parallel resonant circuit in series for the second harmonics. The proposed Class-E/F3 SPA has a structure utilizing a series resonant circuit
Externí odkaz:
https://doaj.org/article/8198c74b877d45aa81c8fa991096ca65
Autor:
Hansik Oh, Jaekyung Shin, Hyeongjin Jeon, Young Yun Woo, Keum Cheol Hwang, Kang-Yoon Lee, Youngoo Yang
Publikováno v:
IEEE Access, Vol 11, Pp 25879-25892 (2023)
This paper presents a 2.8-3.8 GHz broadband 2-stage fully differential Doherty power amplifier using direct interstage power division based on a 2- $\mu \text{m}$ InGaP/GaAs HBT process for 5G new radio handset applications. A compact transformer-les
Externí odkaz:
https://doaj.org/article/189291a661444940bac626241146eb83
Autor:
Hyungmo Koo, Jaekyung Shin, Woojin Choi, Soohyun Bin, Hansik Oh, Hongjun Lim, Kang-Yoon Lee, Keum Cheol Hwang, Youngoo Yang
Publikováno v:
IEEE Access, Vol 10, Pp 125365-125375 (2022)
Microwave power transfer (MPT) has been widely studied, as sensors or mobile/wearable devices have been used, especially for IoT applications. A beamforming algorithm is essential and important for both the performance and the system complexity of MP
Externí odkaz:
https://doaj.org/article/f48fda8e3f59478eabc5a122a923b1a8
Autor:
Yifei Chen, Woojin Choi, Jaekyung Shin, Hyeongjin Jeon, Sooncheol Bae, Young Chan Choi, Seungmin Woo, Young Yun Woo, Hansik Oh, Kang-Yoon Lee, Keum Cheol Hwang, Youngoo Yang
Publikováno v:
IEEE Access, Vol 10, Pp 77487-77497 (2022)
This paper presents a generalized expression of the modified load networks (MLNs) for Doherty power amplifiers (DPAs) with an extended output power back-off (OBO) range. Based on the analysis using this new expression, a new circuit structure general
Externí odkaz:
https://doaj.org/article/cf05fa74105c4fc1b4898f927811ee14
Autor:
Hansik Oh, Sungjae Oh, Hyungmo Koo, Woojin Choi, Jaekyung Shin, Keum Cheol Hwang, Kang-Yoon Lee, Youngoo Yang
Publikováno v:
IEEE Access, Vol 9, Pp 45230-45241 (2021)
This paper presents a high-efficiency wireless power transfer (WPT) system that can charge multiple receivers (Rx’s) of various types. For system analysis, the transmitted power and received power levels are derived using the parameters of the reso
Externí odkaz:
https://doaj.org/article/3f6e91b7354d42549d2ddc1b7e2b0f0b
Autor:
Jaekyung Shin, Jongseok Bae, Hyungmo Koo, Sooncheol Bae, Jongyun Na, Hansik Oh, Hyungjin Jeon, Hoseok Jung, Young Chan Choi, Seungmin Woo, Chan Mi Song, Keum Cheol Hwang, Kang-Yoon Lee, Youngoo Yang
Publikováno v:
IEEE Access, Vol 9, Pp 72316-72325 (2021)
The microwave power transfer (MPT) system requires a massive Tx array for building a focused radio wave to efficiently transfer power to the Rx. Beamforming IC is one of the core elements for the massive Tx array. This paper presents a 5.8 GHz 4-chan
Externí odkaz:
https://doaj.org/article/37a8382640924091a904f9269925b25b
Autor:
Hansik Oh, Jaekyung Shin, Woojin Choi, Yifei Chen, Hyeongjin Jeon, Young Chan Choi, Hyungmo Koo, Keum Cheol Hwang, Kang-Yoon Lee, Youngoo Yang
Publikováno v:
IEEE Access, Vol 9, Pp 147768-147779 (2021)
This article presents a hybrid envelope tracking (ET) supply modulator (SM) integrated circuit (IC) based on a Class-AB linear amplifier (LA) with supply voltage and temperature insensitive quiescent current. For ET mode, to further improve efficienc
Externí odkaz:
https://doaj.org/article/5fb49a9788954820b5f5799569311599
Autor:
Jongseok Bae, Sang-Hwa Yi, Hyungmo Koo, Sungjae Oh, Hansik Oh, Woojin Choi, Jaekyung Shin, Chan Mi Song, Keum Cheol Hwang, Kang-Yoon Lee, Youngoo Yang
Publikováno v:
IEEE Access, Vol 8, Pp 196024-196033 (2020)
This paper presents a look-up table (LUT)-based focal beamforming system that can effectively transmit RF power up to mid-range distances (≤ 3 m) including when the Rx is in the near-field zones. The Tx elements control and radiate signals for the
Externí odkaz:
https://doaj.org/article/3f4ebd5596db4eb181c772eddd4ce903
Autor:
Wooseok Lee, Hyunuk Kang, Hwiseob Lee, Jongseok Bae, Sungjae Oh, Hansik Oh, Hyungmo Koo, Jangsup Yoon, Keum Cheol Hwang, Kang-Yoon Lee, Youngoo Yang
Publikováno v:
IEEE Access, Vol 7, Pp 176658-176667 (2019)
This paper presents a two-stage stacked power amplifier integrated circuit (PAIC) for broadband and high efficiency using a 2-μm InGap/GaAs HBT process with a second-harmonic control circuit and a bias-switching circuit for an average power tracking
Externí odkaz:
https://doaj.org/article/b4501f96e08a44a29196d1ac8a48de93
Publikováno v:
Applied Sciences, Vol 11, Iss 1, p 429 (2021)
To improve the performance of analog, RF, and digital integrated circuits, the cutting-edge advanced CMOS technology has been widely utilized. We successfully designed and implemented a high-speed and low-power serial-to-parallel (S2P) converter for
Externí odkaz:
https://doaj.org/article/c44f20e4ba2b4f098e43d1cb41fcaf22