Browsing by Author "Hsieh, Kuan-Han"

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40 nm-CMOS W-band Phase Shifter for Millimeter-wave Phased Array
(2019-01-01)
Huang, Ching-Ying
;
Hsieh, Kuan-Han
;
Hu, Robert
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電機學院
;
College of Electrical and Computer Engineering
With its low attenuation and high directivity, the 77 similar to 110 GHz (W-band) frequency range is suitable for long-distance broadband applications. Although only 77 GHz and 94 GHz have been used for vehicular radar and military surveillance so far, the W-band spectra is destined to play an even important role in the post-5G era. This manuscript describes our development on the 40 nm-CMOS W-band phase shifter design where 5 bits are used for phase shift of 11.25 degrees while additional 4-bit logics are for fine-tuning purpose. The input signal is first be amplified by a wideband amplifier and then transformed through poly-phase circuit into I/Q signals, whose magnitude will then be altered by the following digital VGAs. By making the vector sum at the output, phase shifting in the range of 0 degrees similar to 360 degrees can be obtained and the resolution is 11.25 degrees.
Design of 18 similar to 26GHz Receiver with Wideband RF, LO and IF in 0.15 mu m GaAs pHEMT Process
(2017-01-01)
Chen, Ying
;
Yu, Zhong-I
;
Huang, Ching-Ying
;
Hsieh, Kuan-Han
;
Hu, Robert
This paper describes our progress in designing the K-band receiver in WIN 0.15 mu m GaAs pHEMT process. The LNA contains three stages of common-source transistors, and its noise performance has been optimized over the intended bandwidth; the following mixer is made of single-balanced transistors where the edge-coupled Marchand balun provides the required 18 similar to 26GHz differential-mode LO while active balun is used for combining the 8GHz IF signals. The conversion gain measured on-wafer at room temperature is around 20dB and the noise temperature is close to 300K, with overall power consumption 140mW, and the chip area is 1000x2500 mu m(2.) A close inspection on the wide-IF-band noise measurement procedure is also provided where the impact of conversion gain on the measured T-n is explored. This receiver circuit will facilitate the construction of large focal plane arrays where compact cryogenic receiver module is in urgent demand.