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:
Jan. 29, 2008
Filed:
Feb. 17, 2006
Chung-gil Yang, Gunpo-si, KR;
Jong-haeng Lee, Daejeon, KR;
Chung-Gil Yang, Gunpo-si, KR;
Jong-Haeng Lee, Daejeon, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
Pulse-width modulation (PWM) circuits and methods integrate a feedback signal and an input signal to generate an integral signal, and generate a PWM signal by switching an output node from a first source voltage to a second source voltage based upon comparing the integral signal with a first reference voltage, and switching the output node from the second source voltage to the first source voltage based upon comparing the integral signal with a second reference voltage. A comparator unit compares the integral signal with the first and second reference (threshold) voltages, and a drive circuit for buffering the comparator unit's output signals generates drive signals. A feedback circuit generates the feedback signal based on (e.g., proportional with) the PWM signal. The switching circuit may include a P-type switch (e.g., PMOS transistor) and a N-type switch (e.g., NMOS transistor). Associated class-D audio amplifiers and modulation methods are provided.