Dual-band transformer-coupled quadrature injection-locked frequency dividers.

This letter proposes a dual-band divide-by-2 transformer-coupled quadrature injection-locked frequency divider (QILFD).The QILFD is composed of a transformer-coupled quadrature voltage controlled oscillator and two injection MOSFETs. The CMOS QILFD has been implemented with the Taiwan Semiconductor Manufacture Company (TSMC) 0.18 μm CMOS technology, and the core power consumption is 3.997 mW at the supply voltage of 0.7 V. The tank impedance of the QILFD shows a dual resonance behavior, which leads to a dual-band locking range at a fixed bias condition. At the injection input power of 3 dBm, the low-band and high-band divide-by-2 locking ranges are from 6.90 to 8.56 GHz and 9.52 to 12.10 GHz, respectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26074 [ABSTRACT FROM AUTHOR]