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:
Feb. 09, 2010
Filed:
Sep. 16, 2005
Lew G. Chua-eoan, Carlsbad, CA (US);
Matthew Levi Severson, Oceanside, CA (US);
Sorin Adrian Dobre, San Diego, CA (US);
Tsvetomir P. Petrov, San Diego, CA (US);
Rajat Goel, Santa Clara, CA (US);
Lew G. Chua-Eoan, Carlsbad, CA (US);
Matthew Levi Severson, Oceanside, CA (US);
Sorin Adrian Dobre, San Diego, CA (US);
Tsvetomir P. Petrov, San Diego, CA (US);
Rajat Goel, Santa Clara, CA (US);
QUALCOMM, Incorporated, San Diego, CA (US);
Abstract
An integrated circuit includes multiple power domains. Supply current switch circuits (SCSCs) are distributed across each power domain. When a signal is present on a control node within a SCSC, the SCSC couples a local supply bus of the power domain to a global supply bus. An enable signal path extends through the SCSCs so that an enable signal can be propagated down a chain of SCSCs from control node to control node, thereby turning the SCSCs on one by one. When the domain is to be powered up, a control circuit asserts an enable signal that propagates down a first chain of SCSCs. After a programmable amount of time, the control circuit asserts a second enable signal that propagates down a second chain. By spreading the turning on of SCSCs over time, large currents that would otherwise be associated with coupling the local and global buses together are avoided.