The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 2009
Filed:
May. 05, 2008
Axel Aguado Granados, Rochester, MN (US);
Benjamin Aaron Fox, Rochester, MN (US);
Nathaniel James Gibbs, Rochester, MN (US);
Andrew Benson Maki, Rochester, MN (US);
Trevor Joseph Timpane, Rochester, MN (US);
Axel Aguado Granados, Rochester, MN (US);
Benjamin Aaron Fox, Rochester, MN (US);
Nathaniel James Gibbs, Rochester, MN (US);
Andrew Benson Maki, Rochester, MN (US);
Trevor Joseph Timpane, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method for enhancing a CML driver circuit to allow efficient, and accurate measurement of the magnitude of the voltage domain noise present near a CML driver in an integrated circuit. The disclosed method for enhancing a CML driver circuit to enable quiet driver measurement includes providing a predetermined low impedance path from the power rail of said CML driver circuit via a first node to the output pins of the circuit and providing a predetermined low impedance path from the ground rail of said CML driver circuit via a second node to the output pins of the circuit. The method also includes disabling the current source causing the pull-up termination circuitry to become high impedance, and the logic driving said inputs of the CML circuit to exist in a low state and performing a low impedance measurement of the power rail noise, ground rail noise and the chip noise in the region of the CML driver.