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:
Dec. 17, 2013
Filed:
Sep. 23, 2011
Liviu Chiaburu, Chandler, AZ (US);
Shahin Mehdizad Taleie, San Diego, CA (US);
Dongwon Seo, San Diego, CA (US);
Roy B. Silverstein, San Diego, CA (US);
Liviu Chiaburu, Chandler, AZ (US);
Shahin Mehdizad Taleie, San Diego, CA (US);
Dongwon Seo, San Diego, CA (US);
Roy B. Silverstein, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A buffer amplifier has a power on state and a sleep state. During regular operation a coupling state of a load to an output node is detected using feedback voltage. In a sleep mode and in a power collapse mode a detection current is injected into the output node, to produce a voltage, and the coupling state of the load is detected from the voltage. Optionally, the detection current and detecting of the voltage on the output node is enables by a low duty cycle clock. Optionally, signals generated in detecting the coupling state are qualified through a debounce circuit.