A CMOS LC injection-locked frequency divider with the division ratio of 2 and 3.

This article proposes a new CMOS LC-tank injection locked frequency divider (ILFD) fabricated in a 0.18-μm CMOS process and describes the operation principle of the ILFD. The ILFD circuit is realized with a double cross-coupled CMOS LC-tank oscillator with a symmetric MOS-switched LC resonator. The ILFD can be used as a first-harmonic injection-locked oscillator, divide-by-2 and divide-by-3 frequency divider depending upon the frequency of the injection signal. Measurement results show that at the supply voltage of 1.8 V, the free-running frequency is from 5.12 to 5.64 GHz. The core current and power consumption of the divider are 2.76 mA and 4.97 mW, respectively. At the incident power of 0 dBm, the locking range is from the incident frequency 9.48 to 11.48 GHz (15.04 to 17.12 GHz) in the divide-by-2(3) mode. © 2009 Wiley Pe riodicals, Inc. Microwave Opt Technol Lett 51: 1263–1267, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24312 [ABSTRACT FROM AUTHOR]