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X-parameter measurement on a GaN HEMT device: complexity reduction study of load-pull characterization test setup 被引量:1
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作者 王晔琳 《Journal of Semiconductors》 EI CAS CSCD 2015年第2期62-71,共10页
Characterization of power transistors is an indispensable step in the design of radio frequency and mi- crowave power amplifiers. A full harmonic load-pull measurement setup is normally required for the accurate and c... Characterization of power transistors is an indispensable step in the design of radio frequency and mi- crowave power amplifiers. A full harmonic load-pull measurement setup is normally required for the accurate and comprehensive characterization of RF power transistors. The setup is usually highly complex, leading to a rela- tively high hardware cost and low measurement throughput. This paper presents X-parameter measurement on a gallium nitride (GaN) high-electron-mobility transistor and studies the potential of utilizing an X-parameter-based modeling technique to highly reduce the complexity of the harmonic load-pull measurement setup for transistor characterization. During the X-parameter measurement and characterization, load impedance of the device is tuned and controlled only at the fundamental frequency and is left uncontrolled at other higher harmonics. However, it proves preliminarily that the extracted X-parameters can still predict the behavior of the device with moderate to high accuracy, when the load impedance is tuned up to the third-order harmonic frequency. It means that a fundamental-only load-pull test setup is already enough even though the device is to be characterized under load tuning up to the third-order harmonic frequency, by utilizing X-parameters. 展开更多
关键词 X-parameters GaN HEMT power amplifier load-pull device characterization behavioral modeling
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High-speed and broad optical bandwidth silicon modulator 被引量:1
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作者 徐浩 李显尧 +3 位作者 肖希 李智勇 俞育德 余金中 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第11期125-129,共5页
A high-speed silicon modulator with broad optical bandwidth is proposed based on a symmetrically configured Mach- Zehnder interferometer. Careful phase bias control and traveling-wave design are used to improve the hi... A high-speed silicon modulator with broad optical bandwidth is proposed based on a symmetrically configured Mach- Zehnder interferometer. Careful phase bias control and traveling-wave design are used to improve the high-speed perfor- mance. Over a broadband wavelength range, high-speed operation up to 30 Gbit/s with a 4.5 dB-5.5 dB extinction ratio is experimentally demonstrated with a low driving voltage of 3 V. 展开更多
关键词 optical modulators integrated optics optoelectronic device characterization
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