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:
Jul. 14, 2015
Filed:
Jan. 30, 2012
Liang Dai, San Diego, CA (US);
Lennart Karl-axel Mathe, San Diego, CA (US);
Liang Dai, San Diego, CA (US);
Lennart Karl-Axel Mathe, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
Techniques for performing noise cancellation/attenuation are disclosed. In one design, an apparatus includes a power supply generator having a switcher, a coupling circuit, an envelope amplifier, and a feedback circuit. The switcher generates DC and low frequency components and the envelope amplifier generates high frequency components of a supply voltage for a load, e.g., a power amplifier. The switcher receives a first supply voltage and provides a switcher output signal having switcher noise. The coupling circuit receives the switcher output signal and provides a first output signal having a first version of the switcher noise. The feedback circuit receives the switcher output signal and provides a feedback signal. The envelope amplifier receives an envelope signal and the feedback signal and provides a second output signal having a second version of the switcher noise, which is used to attenuate the first version of the switcher noise at the load.