Skip to main content
An Extended Frequency Range CMOS Voltage-Controlled Oscillator
Departmental Papers (ESE)
  • Chao Xu, PMC-Sierra, Inc.
  • Winslow Sargeant, National Science Foundation
  • Kenneth R Laker, University of Pennsylvania
  • Jan Van der Spiegel, University of Pennsylvania
This paper presents an extended frequency range CMOS monolithic voltage-controlled oscillator (VCO) design. A negative feedback control algorithm is used to automatically adjust the VCO range according to the control voltage. Based on this analog feedback control algorithm, the VCO achieves a wide range without any pre-register settings. Low phase noise is achieved by using both coarse control and fine control in VCO. A 600 MHz to 3.3 GHz monolithic CMOS PLL based on this wide range and low phase noise VCO has been fabricated in TSMC 0.18 μm, 1.8V CMOS technology and is used in many different applications such as FC, GE, and SONET etc.
Document Type
Conference Paper
Date of this Version
Copyright 2002 IEEE. Reprinted from Proceedings of the 9th IEEE International Conference on Electronics, Circuits and Systems (ICECS 2002), Volume 2, pages 425-428.
Publisher URL:

This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Pennsylvania's products or services. Internal or 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 must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
  • VCO,
  • PLL,
  • voltage-controlled oscillator,
  • phase-locked loop,
  • phase-noise
Citation Information
Chao Xu, Winslow Sargeant, Kenneth R Laker and Jan Van der Spiegel. "An Extended Frequency Range CMOS Voltage-Controlled Oscillator" (2002)
Available at: