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:
Apr. 28, 2015
Filed:
Mar. 21, 2013
Applicant:
Nxp B.v., Eindhoven, NL;
Inventor:
Gertjan Van Holland, Ede, NL;
Assignee:
NXP, B.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/38 (2006.01); H03F 3/217 (2006.01);
U.S. Cl.
CPC ...
H03F 3/2178 (2013.01);
Abstract
A 3-level class D amplifier circuit comprises a first comparator for comparing an input with a first triangular reference and a second comparator for comparing the input with a second triangular reference. A phase relationship between the signals to the first comparator is 180 degrees shifted relative to a phase relationship between the signals to the second comparator. An amplifier stage generates a three-level PWM output signal using the outputs of the first and second comparators. A shared feedback path is used from the three-level PWM output signal.