A Noise-Shifting Differential Colpitts VCO

Abstract

A novel noise-shifting differential Colpitts VCO is presented. It uses current switching to lower phase noise by cyclostationary noise alignment and improve the start-up condition. A design strategy is also devised to enhance the phase noise performance of quadrature coupled oscillators. Two integrated VCOs are presented as design examples.

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"©2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE." Manuscript received April 30, 2002; revised July 1, 2002. This work was supported in part by the Lee center for advance networking, NSF-ERC, ONR-MURI, and a fellowship from IBM Corporation. The authors would like to thank Skyworks Solutions and Jazz Semiconductor for fabrication of the oscillators and, in particular, S. Lloyd, R. Magoon, F. In'tveld, and B. Bhattacharyya of Skyworks Solutions (formerly known as the Wireless Communication Division of Conexant) and M. Racanelli, S. Stetson, and A. Karroy of Jazz Semiconductor for consistent support and help. They would also like to acknowledge I. Aoki, D. Ham, and S. Kee of the California Institute of Technology for valuable technical discussions.

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