Design of a three-stage ring-type voltage-controlled oscillator with a wide tuning range by controlling the current level in an embedded delay cell

Won Tae Lee, Jaemin Shim, Jichai Jeong

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

This paper presents a new design for a three-stage voltage-controlled differential ring oscillator embedded with a delay cell for a wide tuning range from 59 MHz to 2.96 GHz by adjusting the current level in the delay cell. The ring oscillator consists of a voltage-to-current converter, coder circuit, three-stage ring with delay cells, and current monitoring circuit to extend the tuning range of the proposed voltage-controlled oscillator. Each functional block has been designed for a minimum power consumption using the TSMC 0.18 μm CMOS technology. We simulate the performances of the proposed voltage-controlled oscillator in terms of phase noise, power consumption, tuning range, and gain. Our simulation results show that the proposed oscillator has the linear frequency-voltage characteristics over a wide tuning range. At each tuning range (mode), the calculated phase noise of the proposed ring oscillator at each tuning range (mode) was -87, -85, -81, and -79 dBc/Hz at a 1 MHz offset from the center frequency. The DC power of the proposed voltage-controlled oscillator consumed 0.86-3 mW under a 1.8 V supply voltage.

Original languageEnglish
Pages (from-to)1328-1335
Number of pages8
JournalMicroelectronics Journal
Volume44
Issue number12
DOIs
Publication statusPublished - 2013 Dec

Bibliographical note

Funding Information:
This work was supported in part by Brain Korea 21 plus project in 2013, in part by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology under Grant 2013R1A1A2009689 and in part by IDEC (IC Design Education Center) for CAD tools.

Keywords

  • CMOS
  • Phase noise
  • RC oscillators
  • Ring oscillator
  • Voltage controlled oscillator (VCO)
  • Voltage to current converter

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Design of a three-stage ring-type voltage-controlled oscillator with a wide tuning range by controlling the current level in an embedded delay cell'. Together they form a unique fingerprint.

Cite this