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

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...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2012-01, Vol.60 (1), p.131-138
Main Authors: CHEN, Huan-Sheng, LU, Liang-Hung
Format: Article
Language:English
Subjects:
Applied sciences
Capacitance
Circuit properties
Clocks
Design. Technologies. Operation analysis. Testing
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Feedback
Gain
Half-quadrature signal generation
Harmonic analysis
Impedance
Integrated circuits
Mixers
Monte Carlo methods
Multiphase
multiphase clocks
Noise levels
Oscillations
Oscillators, resonators, synthetizers
Phase error
phase interpolator
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Signal generation
System-on-a-chip
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Summary: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-μm 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° to 7° at the half-quadrature outputs without any feedback correction.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2011.2175236