Design of Broadband Down-converted Mixer and Switch Type Phase Shifter for Vital Sign Detector Applications
Date Issued
2015
Date
2015
Author(s)
Wang, Huei-Wen
Abstract
Mixer and phase shifter are important circuit components in radio frequency transceivers. Broadband down-converted mixer can be applied to muti-band and solve the problem of large chip area and extra power. The output baseband signal can be enlarged by a transimpedance amplifier which can both filter the high local oscillation frequency and transfer the high output voltage to the analog to digital converter. As the growing demands for wireless communication, phase array technique is another design issue. Muti-bit phase shifter can provide high resolution for phase array and make the antenna direct precisely. By use of the complementary metal oxide semiconductor manufacturing process, a broadband down mixer for vital sign detect application and K band down mixer with TIA and 5-bit phase shifter are proposed.In chapterⅡ, a broadband mixer for vital sign application is proposed. Replace the narrow band passive marchand balun, two built-in broadband active baluns are utilized to provide differential signal. Combined with the passive ring mixer can produce a broadband down-converted mixer while maintaining well linearity and lower power consumption. In chapterⅢ, a K band triple cascaode mixer with transimpedance amplifier (TIA) can enlarge the baseband signal. The total power consumption can be reduced due to the modified bias at triple cascode mixer. The current mirror topology TIA can maintain the bandwidth and high gain with shunt feedback. In Chapter Ⅳ, a digitally-controlled switch type phase shifter is applied in X band phase array with resolution of 11.25 degree. Replace the inductor with transmission line, the chip size can be smaller and more compact. And for precise simulation, the PEX extraction is used in consideration of layout parasitic resistance and conductance.
Subjects
active balun
mixer
transimpedance amplifier
phase shifter
Type
thesis
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