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High-Speed CMOS Ring Voltage Controlled Oscillator With Low Supply Sensitivity

Technology Benefits

Can suppress the supply noise-induced periodic jitter and minimize the frequency variation of the VCO without requiring a dedicated clean power supply or extra regulator circuitry.

Technology Application

For use in communication IC (integrated circuit) chip products

Detailed Technology Description

This invention is an enhancement of a voltage-controlled oscillator (VCO), realized using a CMOS fabrication process. The purpose of which is to reduce the oscillator’s sensitivity to perturbations in the supply voltage as such perturbations lead to excess jitter in the VCO output. The fundamental principle of the invention is to insert compensation circuitry in parallel with each stage of the CML-based ring oscillator. This compensation circuitry exhibits a dependence on the supply voltage that is the opposite of that of the stage, thereby minimizing the frequency variation in the presence of supply perturbations. Internal and external noise can cause jitter or deviation from true periodicity in a Voltage Controlled Oscillator (VCO). Low jitter in the VCO output is crucial to proper signal integrity, as excess jitter in the VCO output increases the bit error-rate of the system in which it is implemented. In the past, techniques to reduce a VCO’s sensitivity to the perturbations have involved employing an additional dedicated power supply that provides a very clean supply voltage or adding extra regulator circuitry, such as a low drop-out regulator, which consumes considerable extra power. This invention reduces jitter and minimizes frequency variation without requiring either a dedicated power supply or extra regulator circuitry.

Supplementary Information

Patent Number: US8692622B2
Application Number: US13236608A
Inventor: Green, Michael M. | Gui, Xiaoyan
Priority Date: 17 Sep 2010
Priority Number: US8692622B2
Application Date: 19 Sep 2011
Publication Date: 8 Apr 2014
IPC Current: H03K000303 | H03B000700 | H03C000322 | H03L000100
US Class: 331057 | 327537 | 331115 | 331177V | 331185 | 331117V
Assignee Applicant: The Regents of the University of California
Title: High-speed CMOS ring voltage controlled oscillator with low supply sensitivity
Usefulness: High-speed CMOS ring voltage controlled oscillator with low supply sensitivity
Novelty: High-speed complementary metal-oxide-semiconductor current-mode-logic based ring voltage controlled oscillator for microelectronic circuits to establish high-speed communication, has circuit whose impedance change counteracts that of cell

Industry

Electronics

Sub Category

Circuit Design

Application No.

8692622

Others

State Of Development

A prototype has been built and tested.

Related Materials

X. Gui, Green M.M., High-Speed CMOS ring oscillators with low supply sensitivity, Custom Integrated Circuits Conference (CICC), 2010 IEEE.doi: 10.1109/CICC.2010.5617609

X. Gui, M. M. Green, Design of ring oscillators with low supply sensitivity, IEEE Transactions on Circuits and Systems I:Regular Papers, vol. 60, July 2013, pp. 1753-1763.

Lead Inventor

Michael Green
Professor, Department of Electrical Engineering and Computer Science
Henry Samueli School of Engineering
University of California, Irvine
http://www.eng.uci.edu/faculty/green/Main.html

 

Additional Technologies by these Inventors

• Referenceless Clock Recovery Circuit with Wide Frequency Acquisition Range

Tech ID/UC Case

21210/2011-114-0

Related Cases

2011-114-0

*Abstract

Voltage-controlled oscillator (VCO) with reduced sensitivity to perturbations in the supply voltage.Features include a CMOS fabrication process, no requirement of a dedicated clean power supply or extra regulator circuitry, and compensation circuitry in parallel with each stage of ring oscillator.

*IP Issue Date

Apr 8, 2014

*Principal Investigator

Name: Michael Green

Department:

Name: Xiaoyan Gui

Department:

Country/Region

USA