High-Speed CMOS Ring Voltage Controlled Oscillator With Low Supply Sensitivity
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.
For use in communication IC (integrated circuit) chip products
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.
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
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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 Additional Technologies by these Inventors Tech ID/UC Case 21210/2011-114-0 Related Cases 2011-114-0
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
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