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An Improved Wideband All-Pass I/Q Network for Millimeter-Wave Phase Shifters

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4 Author(s)
Sang Young Kim ; Dept. of Electr. & Comput. Eng., Univ. of California at San Diego, La Jolla, CA, USA ; Dong-Woo Kang ; Kwang-Jin Koh ; Rebeiz, G.M.

This paper presents the design and analysis of an improved wideband in-phase/quadrature (I/Q) network and its implementation in a wideband phased-array front-end. It is found that the addition of two resistors (Rs) in the all-pass I/Q network results in improved amplitude and phase performance versus capacitance loading and frequency, which is essential for wideband millimeter-wave applications. A prototype 60-80-GHz phased-array front-end based on 0.13-μm SiGe BiCMOS is demonstrated using the improved quadrature all-pass filter and with 4-bit phase-shifting performance at 55-80 GHz. Application areas are in wideband millimeter-wave systems.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:60 ,  Issue: 11 )