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Audio amplifier

an amplifier and amplifier technology, applied in the field of audio amplifiers, can solve the problems of low efficiency but achieve the effect of improving reliability and linearity characteristics and reducing power consumption

Inactive Publication Date: 2011-04-07
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Some example embodiments provide an audio amplifier configured to improve power efficiency.
[0026]Accordingly, in the audio amplifier according to some example embodiments, the calibration unit generates the digital approximation code and the compensation unit stores the digital approximation code as the compensation code corresponding to the offset of the output signal. Thus, the audio amplifier according to some example embodiments may effectively compensate the offset of the output signal and a quiescent current flowing through the audio amplifier may be reduced. In addition, in the audio amplifier according to some example embodiments, reliability and linearity characteristics may be improved and power consumption may be reduced.

Problems solved by technology

The class-A amplifier is used for amplifying a small signal, but has relatively low efficiency.

Method used

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Examples

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Embodiment Construction

[0040]Various example embodiments will be described more fully with reference to the accompanying drawings, in which embodiments are shown. This inventive concept may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. Like reference numerals refer to like elements throughout this application.

[0041]It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the inventive concept. As used herein, the term “an...

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Abstract

An audio amplifier includes a compensation unit, an output unit and a calibration unit. The compensation unit generates a compensation signal based on a digital input signal, a digital reference code, a mode signal and a digital approximation code. The output unit generates an output signal based on the compensated input signal. The calibration unit generates the digital approximation code based on the output signal and the mode signal. The digital approximation code includes a plurality of bits that are generated sequentially.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority under 35 USC §119 to Korean Patent Application No. 10-2009-0094000, filed on Oct. 1, 2009 in the Korean Intellectual Property Office (KIPO), the contents of which is herein incorporated by reference in its entirety.BACKGROUND[0002]1. Technical Field[0003]Example embodiments relate to an audio amplifier, and more particularly to an audio amplifier that compensates a DC offset included in an output signal thereof.[0004]2. Description of the Related Art[0005]An audio amplifier is widely used to amplify an input audio signal to provide an amplified output audio signal for driving a load such as a speaker. Generally, the audio amplifier may be categorized into a class-A amplifier, a class-B amplifier, a class-AB amplifier and a class-D amplifier. The class-A, class-B and class-AB amplifiers may be used in an analog system and the class-D amplifier may be used in a digital system.[0006]The class-A amplifier is us...

Claims

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Application Information

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IPC IPC(8): H03F3/04H03F1/00
CPCH03F1/30H03F3/181H03F3/217
Inventor LEE, YONG-HEESEOK, CHUN KYUNYEUM, WANG-SEUPYOU, SEUNG-BINKIM, BONG-JOO
Owner SAMSUNG ELECTRONICS CO LTD
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