Invention Grant
- Patent Title: Distortion correction in class-D amplifiers
- Patent Title (中): D类放大器的失真校正
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Application No.: US13683637Application Date: 2012-11-21
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Publication No.: US08773197B2Publication Date: 2014-07-08
- Inventor: Dustin Dale Forman , Trevor Blake Lynch-Staunton , Montana T. C. Reid
- Applicant: ESS Technology, Inc.
- Applicant Address: US CA Fremont
- Assignee: ESS Technology, Inc.
- Current Assignee: ESS Technology, Inc.
- Current Assignee Address: US CA Fremont
- Agency: Gard & Kalsow LLP
- Main IPC: H03F3/38
- IPC: H03F3/38

Abstract:
The present application describes an apparatus and method for reducing distortion in a class-D amplifier. The power output section of the amplifier is driven by an adjusted PWM signal, rather than by a PWM signal created directly from the input analog signal. A reference output, designed to closely track the input analog signal, is compared to the amplifier output. The resulting difference is an error signal which is inverted and summed with a second analog signal corresponding to the directly created PWM signal and changes the timing of the voltage transitions of the second analog signal. The changed voltage transitions are used to create the adjusted PWM signal. The inversion of the error signal causes negative feedback which results in the adjustment of the PWM signal being in a direction which reduces the error signal and thus the distortion of the amplifier.
Public/Granted literature
- US20130241647A1 Distortion Correction in Class-D Amplifiers Public/Granted day:2013-09-19
Information query
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