An Open-Loop Half-Quadrature Hybrid for Multiphase Signals Generation

作者：Chen Huan Sheng^*; Lu Liang Hung

来源：IEEE Transactions on Microwave Theory and Techniques, 2012, 60(1): 131-138.

DOI：10.1109/TMTT.2011.2175236

• Half-quadrature signal generation
• multiphase clocks
• phase interpolator

In this paper, a passive half-quadrature hybrid (HQH) is presented for multiphase signal generation at radio frequencies. Utilizing capacitance ratios as the primary design parameters, the proposed hybrid exhibits excellent magnitude and phase balance even in the presence of process and temperature variations. Therefore, it is well suited for integrated-circuit designs with on-chip capacitive elements. Using a standard 0.18-mu m CMOS process, the HQH circuit is integrated with a 5.6-GHz quadrature voltage-controlled oscillator (QVCO) and four down-conversion mixers for demonstration. As the QVCO oscillation frequency sweeps from 5.4 to 5.8 GHz, the measurement results indicate a root-mean-square (rms) magnitude error less than 0.5 dB and an rms phase error ranging from 4 degrees to 7 degrees at the half-quadrature outputs without any feedback correction.

• 出版日期2012-1
• 单位中国科学院电工研究所