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Wide locking range divide-by-4 injection locked frequency dividers

✍ Scribed by Shao-hua Lee; Sheng-Lyang Jang; Chien-Feng Lee; Miin-Horng Juang

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
391 KB
Volume
49
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

This article proposes techniques for improving locking range of divide‐by‐4 injection locked frequency divider (D4ILFD). Two D4ILFDs were designed and implemented. One D4ILFD is made of tapped resonator; the other ILFD is made of switched resonator. Both circuits use a complementary CMOS LC‐tank oscillator and are based on the direct injection topology. The wideband function of switched resonator D4ILFD is obtained by tuning the switch across the tank inductors and the varactors. At the supply voltage of 1.8 V and at the incident power of 0 dBm, the locking range of switched resonator D4ILFD is from 7.11 to 9.4 GHz. At the supply voltage of 1.2 V and at the incident power of 0 dBm, the locking range of the tapped inductor D4ILDS is from 7.39 to 9.44 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1533–1536, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22481

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