Design of a class G audio amplifier

The demand for audio power amplifier in portable multimedia devices has been on a rise. For both manufacturers and consumers, power efficiency to maintain long battery lifetime, miniaturization to achieve smaller form factor and low Total Harmonic Distortion (THD) for quality sound synthesis are the...

Full description

Saved in:
Bibliographic Details
Main Author: Zhang, Huiyuan
Other Authors: Chan Pak Kwong
Format: Theses and Dissertations
Language:English
Published: 2011
Subjects:
Online Access:https://hdl.handle.net/10356/46549
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-46549
record_format dspace
spelling sg-ntu-dr.10356-465492023-07-04T16:16:24Z Design of a class G audio amplifier Zhang, Huiyuan Chan Pak Kwong Tan Meng Tong School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Electronic systems The demand for audio power amplifier in portable multimedia devices has been on a rise. For both manufacturers and consumers, power efficiency to maintain long battery lifetime, miniaturization to achieve smaller form factor and low Total Harmonic Distortion (THD) for quality sound synthesis are the key factors in choosing new audio gear. Linear amplifiers, such as Class A, Class B and Class AB amplifiers have low power efficiency. On the other hand, Class D amplifier which is switching amplifier, despite its relatively higher power efficiency, suffers from large form factor due to the external inductor. To address the above mentioned problems, an inductorless Class G power amplifier has been designed, operating with a single power supply. It is capable of driving a loudspeaker of up to 8Ω in parallel with a 220pF capacitive load while consuming quiescent current as low as 5mA. The proposed Class G power amplifier consists of the power supply unit and the switched-supply based amplifier unit. The power supply unit utilizes a switched-capacitor DC-DC step-down converter. It has a pulse-skip regulation to convert the external power supply (3.6V) into an internal supply rail with lower voltage (1.6V). Inside the switched-supply based amplifier unit, the supply control circuit selects between the external power supply and internal supply rail. The selection is based on the instantaneous input voltage information. The preamplifiers and DC control circuit adjust the DC offset of input audio signal into an optimum DC operating level. This design uses bridge-tied-load Class AB configuration in order to maximize the output power. MASTER OF ENGINEERING (EEE) 2011-12-21T02:41:19Z 2011-12-21T02:41:19Z 2011 2011 Thesis Zhang, H. (2011). Design of a class G audio amplifier. Master’s thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/46549 10.32657/10356/46549 en 114 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Electrical and electronic engineering::Electronic systems
spellingShingle DRNTU::Engineering::Electrical and electronic engineering::Electronic systems
Zhang, Huiyuan
Design of a class G audio amplifier
description The demand for audio power amplifier in portable multimedia devices has been on a rise. For both manufacturers and consumers, power efficiency to maintain long battery lifetime, miniaturization to achieve smaller form factor and low Total Harmonic Distortion (THD) for quality sound synthesis are the key factors in choosing new audio gear. Linear amplifiers, such as Class A, Class B and Class AB amplifiers have low power efficiency. On the other hand, Class D amplifier which is switching amplifier, despite its relatively higher power efficiency, suffers from large form factor due to the external inductor. To address the above mentioned problems, an inductorless Class G power amplifier has been designed, operating with a single power supply. It is capable of driving a loudspeaker of up to 8Ω in parallel with a 220pF capacitive load while consuming quiescent current as low as 5mA. The proposed Class G power amplifier consists of the power supply unit and the switched-supply based amplifier unit. The power supply unit utilizes a switched-capacitor DC-DC step-down converter. It has a pulse-skip regulation to convert the external power supply (3.6V) into an internal supply rail with lower voltage (1.6V). Inside the switched-supply based amplifier unit, the supply control circuit selects between the external power supply and internal supply rail. The selection is based on the instantaneous input voltage information. The preamplifiers and DC control circuit adjust the DC offset of input audio signal into an optimum DC operating level. This design uses bridge-tied-load Class AB configuration in order to maximize the output power.
author2 Chan Pak Kwong
author_facet Chan Pak Kwong
Zhang, Huiyuan
format Theses and Dissertations
author Zhang, Huiyuan
author_sort Zhang, Huiyuan
title Design of a class G audio amplifier
title_short Design of a class G audio amplifier
title_full Design of a class G audio amplifier
title_fullStr Design of a class G audio amplifier
title_full_unstemmed Design of a class G audio amplifier
title_sort design of a class g audio amplifier
publishDate 2011
url https://hdl.handle.net/10356/46549
_version_ 1772825659425423360