A study of superharmonic injection locking in multiband frequency dividers |
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Authors: | F. Plessas |
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Affiliation: | Department of Computer and Communication Engineering, University of Thessaly, 37 Glavani‐28th October Str., Deligiorgi Building, 4th floor, 382 21 Volos, Greece |
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Abstract: | A superharmonic voltage‐controlled injection‐locked frequency divider, implemented using a modified Colpitts oscillator operating at 2.5, 5 and 10 GHz and a cross‐coupled LC oscillator operating at 1.25, 2.5 and 5 GHz, is demonstrated. The proposed triple‐band operation is achieved by employing a novel technique that uses pin‐diodes and negative power supply. The discrete dividers, built with low noise hetero‐junction FETs and high‐frequency SiGe BJTs, are described theoretically while their functionality is proven experimentally. Additionally, a short phase noise analysis, which is missing in the literature, is given. Phase noise, frequency range of operation, and locking range measurement results are presented. Finally, post‐layout simulation results of a 5 GHz fully differential injection‐locked frequency divider, implemented in a 0.25µm SiGe process are provided. Copyright © 2010 John Wiley & Sons, Ltd. |
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Keywords: | injection‐locking phase noise frequency divider |
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