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LC-tank injection-locked frequency divider with variable division ratio

✍ Scribed by S.-L. Jang; C.-C. Liu; Ching-Wen Hsue

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
539 KB
Volume
50
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

In this study, a multimodulus CMOS injection‐locked frequency divider (ILFD) fabricated in a 0.18‐μm CMOS process is designed and the operation principle of the ILFD is described, which was realized using a cross‐coupled PMOS LC‐tank oscillator as the load of a double‐balanced NMOS Gilbert mixer. The stacked structure allows entire mixer current to be reused by the VCO cross‐coupled pair. At the supply voltage of 1.8 V, the free‐running frequency is from 2.31 to 2.65 GHz. Division ratio of 2, 3, 4, and 6 can be found in the ILFD function, and the ILFD can also function as a first‐harmonic injection‐locked oscillator. At the incident power of 0 dBm, the locking range in the ÷2 mode is from the incident frequency 3.4 to 6.4 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3232–3236, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23928

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