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A 10.5‐GHz divide‐by‐3 injection‐locked frequency divider with enhanced locking range by even‐harmonic phase tuning in 0.18 μm BiCMOS
Author(s) -
Lee Sanghun,
Jang Sunhwan,
Nguyen Cam
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28575
Subject(s) - frequency divider , voltage controlled oscillator , electrical engineering , inductor , materials science , harmonic , harmonics , injection locking , phase shift module , microwave , voltage , phase (matter) , optoelectronics , engineering , physics , cmos , telecommunications , acoustics , insertion loss , optics , laser , quantum mechanics
A fully integrated 10.5‐GHz divide‐by‐3 (1/3) injection‐locked frequency divider (ILFD) that can provide extra locking range is presented. The ILFD consists of a previously measured on‐chip 10.5‐GHz voltage controlled oscillator (VCO) functioning as an injection source, a 1/3 ILFD core, and an output inverter buffer. A phase tuner implemented using an asymmetric inductor is proposed to increase the locking range through even‐harmonic phase tuning. With a fixed internal injection signal power of only −18 dBm, a 25% enhancement in the locking range from 12 to 15 MHz is achieved with the proposed phase tuning. The proposed even‐harmonic phase tuning can be used to provide extra locking range to those achieved by other techniques. The proposed integrated 1/3 ILFD has a frequency tuning range of 3.3–4.2 GHz. It is realized using a 0.18‐μm BiCMOS process, occupies 0.6 mm × 0.7 mm, and consumes 10.6 mA while the ILFD core alone only consumes 6.15 mA from 1.8‐V supply voltage. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2249–2252, 2014