A High-Precision Ultra-Broadband Quadrature Generation at Millimeter-Wave Frequencies
作者： Zhiwei Xu , Kailong Zhao
DOI: 10.1109/IPEC51340.2021.9421282
关键词: CMOS 、 Extremely high frequency 、 Acoustics 、 Image response 、 Frequency band 、 Signal generator 、 Power dividers and directional couplers 、 Physics 、 Transmission line 、 Quadrature (mathematics)
摘要: In this paper, a high-precision ultra-broadband quadrature signal generator for millimeter-wave frequency band is proposed. The structure of cascade directional couplers adopted, and the transmission line equivalent lumped model are used to connect couplers. proposed analyzed using S-parameter matrix, corresponding theoretical formulas provided. simulation prototype constructed 28 nm CMOS technology, so it can be integrated into small area chip. range 50-150 GHz, measured S11 S22 design both less than -10 dB, while gain mismatch 1 phase fewer five degrees. Compared traditional quarter wavelength coupler, guarantee output when load changes reducing mismatches. same range, image rejection ratio over 20 dB. whole size coupler (HPUBC) 260 um $\times 450$ um. designs verified by 3D electromagnetic simulation.
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