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Divide-by-3 LC injection locked frequency divider with a transformer as an injector's load

✍ Scribed by Sheng-Lyang Jang; Pei-Xi Lu; C. F. Lee; M.-H. Juang

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 503 KB
Volume: 50
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.23775

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✦ Synopsis

Abstract

This letter proposes a new divide‐by‐3 injection‐locked frequency divider (ILFD) fabricated in the 0.35‐μm CMOS 2P4M CMOS technology. The divider consists of a pMOS cross‐coupled LC oscillator, two injection MOSFETs, and a transformer staggered in between the cross‐coupled pMOSFETs and injection FETs, and the LC resonator is composed of two inductors and varactors. The injection FET uses the transformer load to increase the locking range. At the supply voltage of 2 V, the divider free‐running frequency is tunable from 2.433 to 2.79 GHz, and at the incident power of 0 dBm the locking range is about 1.13 GHz (14.9%), from the incident frequency 7.17–8.3 GHz. The core power consumption is 8.64 mW. The die area is 1.36 × 0.8 mm^2^. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2722–2725, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23775

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