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:
Jun. 07, 2016
Filed:
Aug. 28, 2014
Applicant:
Qualcomm Technologies International, Ltd., Cambridge, GB;
Inventor:
David Chappaz, Milton, GB;
Assignee:
QUALCOMM TECHNOLOGIES INTERNATIONAL, LTD., Cambridge, GB;
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/217 (2006.01); H03F 3/45 (2006.01); H03H 11/04 (2006.01); H03K 7/08 (2006.01);
U.S. Cl.
CPC ...
H03H 11/0405 (2013.01); H03F 3/217 (2013.01); H03F 3/2175 (2013.01); H03K 7/08 (2013.01);
Abstract
A signal converter directly converts pulse-density-modulated (PDM) signals into pulse-width-modulated (PWM) signals. A noise-shaping loop architecture can be configured to apply a signal transfer function having a low-pass filter effect, and a noise transfer function having a high-pass filter effect. Decimation and interpolation can ensure that the noise-shaping loop architecture operates at a first sampling frequency, while the PWM modulator operates at a second, higher sampling frequency.