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. 08, 2015
Filed:
Apr. 12, 2013
Apple Inc., Cupertino, CA (US);
David A. Hardell, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A system to eliminate acoustic noise caused by a first Multi-Layer Ceramic Capacitor (MLCC) array positioned on a printed circuit board (PCB) is disclosed. The first MLCC array generates a first vibration responsible for the acoustic noise in response to receiving a varying input voltage. A third MLCC array senses the first vibration and generates a feedback signal. An adaptive filter then uses the feedback signal to generate an output signal that is used by a second MLCC to generate a second vibration that acts as a counter to dampen the first vibration. Because the input voltage signal is varying in time, the adaptive filter continually samples the varying input voltage and the feedback signal to generate the output signal that minimizes the acoustic noise. The second and third MLCC arrays are selectively positioned and oriented on the PCB for optimum performance.