PLL论文——A Double-Balanced Quadrature-Input Quadrature-Output Regenerative Frequency Divider for UWB Synthesizer Applications.pdf

2944 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS—I: REGULAR PAPERS, VOL. 55, NO. 9, OCTOBER 2008 A Double-Balanced Quadrature-Input Quadrature-Output Regenerative Frequency Divider for UWB Synthesizer Applications Hui Zheng and Howard C. Luong , Senior Member, IEEE Abstract— This paper presents the design and analysis of a proposed double-balanced quadrature-input quadrature-output (QIQO) regenerative divider for ultra-wideband (UWB) syn- thesizer applications. By fully utilizing the quadrature phase outputs already existed in a quadrature voltage-controlled oscil- lator (QVCO) or any other quadrature signal generator (QSG), the proposed QIQO divider provides a mechanism to achieve an output IQ phase sequence that is inherently tracked with the input IQ phase sequence. Moreover, compared with con- ventional dividers, the QIQO divider provides not only smaller and better-matched input loading to the QSG but also improved quadrature phase accuracy, wider operation range, smaller third harmonics, and lower power consumption. Fabricated in a - m CMOS process, the QIQO divider measures an image rejection of 62 dBc with a frequency operation range of larger than % from GHz to GHz while consuming mW at -V supply. Index Terms— Divider, image rejection, IQ, LO generation, phase-locked loop (PLL), quadrature, sideband rejection, single-sideband, synthes