Browsing by Author "Li, Meng-Che"

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Analysis and Design of Broadband LC-Ladder FET LNAs Using Noise Match Network
(2018-02-01)
Hsiao, Yu-Chih
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Meng, Chinchun
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Li, Meng-Che
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電機工程學系
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Department of Electrical and Computer Engineering
A noise match network for the LC-ladder input network of a broadband inductively source-degenerated common-source (CS) field effect transistor (FET) low-noise amplifier (LNA) is established through noise transformation matrix to derive the noise parameters of a broadband LNA. Analytical formulas for the noise factors of a CS FET LNA with a three-section LC-ladder input network are thus obtained based on the design algorithm of optimal noise and input match developed in this paper. Two 3.7-10.5 GHz two-stage LNAs of the same topology are demonstrated using 0.15-mu m pHEMT technology to validate the design methodology. One LNA has all the fully integrated inductors and the other uses two on-chip inductors replaced by two high-Q bondwire inductors for better noise performance. The measurement results show 11-dB power gain with 2.1-dB noise figure for the LNA with the fully integrated inductors and 11-dB power gain with 1.6-dB noise figure for the LNA with two bondwire inductors, respectively.
Balanced Noise Design of Dual-Band 2.4/5-GHz pHEMT LNAs
(2020-01-01)
Meng, Chinchun
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Chang, Wei-Ling
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Hsiao, Yu-Chih
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Li, Meng-Che
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Chien, Hsin-Yi
This paper presents dual-band 2.4/5-GHz dual-band pHEMT LNAs based on a balanced noise design approach using 0.15 m pHEMT technology. A dual-band LNA has two input match frequencies without simultaneous noise match at these two frequencies especially when the extrinsic loss caused by the inductor is absent. Noise parameters as a function of frequencies for a dual-band FET LNA based on the balanced noise performance are developed. The fully integrated pHEMT LNA achieves power gain of 18 dB at 2.4 GHz and 12 dB at 5 GHz and noise figure about 3 dB at 2.4 GHz and 5 GHz, respectively, at 12.6 mA and 3 V. The pHEMT LNA with a bondwire inductor at input match demonstrates a distinct balanced noise performance.