Low Power Class D Audio Amplifier with High Performance and High Efficiency

This paper presents the design and implementation of a novel pulse width modulation control class D amplifiers chip. With high-performance, low-voltage, low-power and small area, these circuits are employed in portable electronic systems, such as the low-power circuits, wireless communication and high-frequency circuit systems. This class D chip followed the chip implementation center advanced design flow, and then was fabricated using Taiwan Semiconductor Manufacture Company 0.35-μm 2P4M mixed-signal CMOS process. The chip supply voltage is 3.3 V which can operate at a maximum frequency of 100 MHz. The total power consumption is 2.8307 mW, and the chip area size is 1.1497×1.1497 mm2. Finally, the class D chip was tested and the experimental results are discussed. From the excellent performance of the chip verified that it can be applied to audio amplifiers, low-power circuits, etc.

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Rack Server Solution in Data Center

Volume 1: Thermal Management ◽

10.1115/ipack2015-48258 ◽

2015 ◽

Cited By ~ 2

Author(s):

Sheng Kang ◽

Guofeng Chen ◽

Chun Wang ◽

Ruiquan Ding ◽

Jiajun Zhang ◽

...

Keyword(s):

Power Consumption ◽

Low Power ◽

Power Supply ◽

Data Center ◽

Power Efficiency ◽

High Performance ◽

High Efficiency ◽

High Growth ◽

General Purpose ◽

Power Supplies

With the advent of big data and cloud computing solutions, enterprise demand for servers is increasing. There is especially high growth for Intel based x86 server platforms. Today’s datacenters are in constant pursuit of high performance/high availability computing solutions coupled with low power consumption and low heat generation and the ability to manage all of this through advanced telemetry data gathering. This paper showcases one such solution of an updated rack and server architecture that promises such improvements. The ability to manage server and data center power consumption and cooling more completely is critical in effectively managing datacenter costs and reducing the PUE in the data center. Traditional Intel based 1U and 2U form factor servers have existed in the data center for decades. These general purpose x86 server designs by the major OEM’s are, for all practical purposes, very similar in their power consumption and thermal output. Power supplies and thermal designs for server in the past have not been optimized for high efficiency. In addition, IT managers need to know more information about servers in order to optimize data center cooling and power use, an improved server/rack design needs to be built to take advantage of more efficient power supplies or PDU’s and more efficient means of cooling server compute resources than from traditional internal server fans. This is the constant pursuit of corporations looking at new ways to improving efficiency and gaining a competitive advantage. A new way to optimize power consumption and improve cooling is a complete redesign of the traditional server rack. Extracting internal server power supplies and server fans and centralizing these within the rack aims to achieve this goal. This type of design achieves an entirely new low power target by utilizing centralized, high efficiency PDU’s that power all servers within the rack. Cooling is improved by also utilizing large efficient rack based fans for airflow to all servers. Also, opening up the server design is to allow greater airflow across server components for improved cooling. This centralized power supply breaks through the traditional server power limits. Rack based PDU’s can adjust the power efficiency to a more optimum point. Combine this with the use of online + offline modes within one single power supply. Cold backup makes data center power to achieve optimal power efficiency. In addition, unifying the mechanical structure and thermal definitions within the rack solution for server cooling and PSU information allows IT to collect all server power and thermal information centrally for improved ease in analyzing and processing.

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A 2.4 mA Quiescent Current, 1 W Output Power Class-D Audio Amplifier With Feed-Forward PWM-Intermodulated-Distortion Reduction

IEEE Journal of Solid-State Circuits ◽

10.1109/jssc.2016.2543704 ◽

2016 ◽

Vol 51 (6) ◽

pp. 1436-1445 ◽

Cited By ~ 3

Author(s):

Tai-Haur Kuo ◽

Shih-Hsiung Chien ◽

Jyun-Jia Huang ◽

Yi-Wen Chen ◽

Yu-An Lee

Keyword(s):

Output Power ◽

Feed Forward ◽

Audio Amplifier ◽

Class D ◽

Quiescent Current ◽

Distortion Reduction ◽

Power Class

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High Efficiency Half Bridge Class-D Audio Amplifier System With Front-End Symmetric Bipolar Outputs LLC Converter

IEEE Transactions on Industrial Electronics ◽

10.1109/tie.2020.2969098 ◽

2021 ◽

Vol 68 (2) ◽

pp. 1220-1230

Author(s):

Duo Xu ◽

Guohua Zhou ◽

Rui Huang ◽

Xianghong Liu ◽

Feiming Liu

Keyword(s):

High Efficiency ◽

Audio Amplifier ◽

Front End ◽

Class D

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Design of a Class-D Audio Amplifier With Analog Volume Control for Mobile Applications

International Journal of Electronics and Telecommunications ◽

10.1515/eletel-2016-0026 ◽

2016 ◽

Vol 62 (2) ◽

pp. 187-196

Author(s):

Karim El khadiri ◽

Hassan Qjidaa

Keyword(s):

Power Efficiency ◽

High Efficiency ◽

Harmonic Distortion ◽

Cmos Technology ◽

Volume Control ◽

Ramp Generator ◽

Audio Amplifier ◽

Class D ◽

Level Shifter ◽

Programmable Gain

Abstract A class-D audio amplifier with analog volume control (AVC) for portable applications is proposed in this paper. The proposed class-D consist of two sections. First section is an analog volume control which consists of an integrator, an analog MUX and a programmable gain amplifier (PGA). The AVC is implemented with three analog inputs (Audio, Voice, FM). Second section is a driver which consists of a ramp generator, a comparator, a level shifter and a gate driver. The driver is designed to obtain a low distortion and a high efficiency. Designed with 0.18 um 1P6M CMOS technology, the class-D audio amplifier with AVC achieves a total root-mean-square (RMS) output power of 0.5W, a total harmonic distortion plus noise (THD+N) at the 8-Ω load less than 0.06% and a power efficiency of 90% with a total area of 1.74 mm2.

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