THE MULTILEVEL TECHNIQUE FOR IMPROVING FILTERLESS CLASS-D AUDIO AMPLIFIERS

2014 ◽  
Vol 23 (04) ◽  
pp. 1450047
Author(s):  
CHUN-WEI LIN ◽  
BING-SHIUN HSIEH
Keyword(s):  
Power Efficiency ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Signal To Noise Ratio ◽  
Harmonic Distortion ◽  
Cmos Technology ◽  
Multilevel Converter ◽  
Audio Amplifiers ◽  
Audio Amplifier ◽  
Class D

Class-D amplifier features very high efficiency on power delivery because its switching operation consumes tiny static power on very low on-resistance. In this work, a multilevel technique is presented to improve total-harmonic-distortion (THD) and signal-to-noise-ratio (SNR) of pulse-width-modulation (PWM) filterless class-D amplifiers. The proposed method consists of a multilevel converter and a time division adder (TDA) followed by PWM modulator. The PWM-modulated signal is arranged into several time divisions and then integrated and encoded to a set of parallel control signals for multilevel converter. Instead of the two-level PWM signal, the output signal of a multilevel converter is as stairway with less transient variation. The performance of THD and SNR are therefore improved because the instantaneous variation of signal is greatly reduced. To demonstrate the proposed method, a filterless audio amplifier was implemented by TSMC 5 V–0.35 μm CMOS technology. With 8 Ω speaker and 550 mW maximum power, experiment results show that the THD, SNR and power efficiency can be achieved over 0.02%, 85 dB and 85%, respectively.

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

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.

A design of a 10-W single-chip class D audio amplifier with very high efficiency using CMOS technology

1999 ◽  
Vol 45 (3) ◽  
pp. 465-473 ◽  
Author(s):  
Soo-Chang Choi ◽  
Jun-Woo Lee ◽  
Woo-Kang Jin ◽  
Jae-Hwan So ◽  
Suki Kim
Keyword(s):  
High Efficiency ◽  
Cmos Technology ◽  
Single Chip ◽  
Audio Amplifier ◽  
Class D ◽  
Very High

scholarly journals KARAKTERISTIK AMPLIFIER CLASS D MENGGUNAKAN FIELD EFFECT TRANSISTOR (FET) TYPE IRF9530 DAN IRF630

2020 ◽  
Vol 12 (2) ◽  
pp. 71
Author(s):  
Budi Santoso ◽  
Zainal Abidin
Keyword(s):  
Power Amplifier ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Large Power ◽  
Class A ◽  
Audio Amplifier ◽  
Class D ◽  
Low Power Dissipation ◽  
Effect Transistor ◽  
Off Time

In the development of power amplifiers, MOSFETs are widely used in the composition of the manufacture. As is known, MOSFETs have a longer on-off time loss compared to IGBT. The loss on the on-off time has an impact on the heat generated by the MOSFET. Class D Audio Amplifier is basically a Switching-Amplifier or Pulse Width Modulation-Amplifier. High efficiency means that it will produce low power dissipation, thus the power wasted is relatively lower when compared to class A, B or AB amplifiers. Because the class D audio amplifier can be said to be more economical because it does not require a large heatsink and a large power supply. The manufacture of the Class D power amplifier system uses a voltage of 28.5 volts DC on the final transistor IRF9530 AND IRF630 measuring the input transistors of 3.3 volts DC, 28.5 volts DC. In the test using an oscilloscope type LS 8050, 50 MHz frequency, the position of the audio input off of the amplifier has sound defects. Testing of the power amplifier is carried out when the treble on the input tone control is full db in the defective amplifier wave.

scholarly journals Perbandingan Efisiensi Daya Penguat Audio Kelas AB dengan Penguat Audio Kelas D untuk Keperluan Sound System Lapangan

2018 ◽  
Vol 10 (2) ◽  
pp. 54-58
Author(s):  
Muhamad Kharis ◽  
Dhidik Prastiyanto ◽  
Suryono Suryono
Keyword(s):  
Output Power ◽  
Power Efficiency ◽  
Input Power ◽  
Sound System ◽  
Class Ab ◽  
Audio Amplifiers ◽  
Class D Amplifier ◽  
Audio Amplifier ◽  
Class D ◽  
Field Sound

Class AB audio amplifiers are commonly used but the efficiency is 50%. While the efficiency of class D audio amplifiers is 90% but are rarely used. The purpose of this research is to know how much the power efficiency of field sound system between 1000 watts class AB amplifier and 900 watts class D amplifier. This study is a comparative study that compares different variables with the same sample. The results of power efficiency are obtained from the percentage comparison between the output power and the input power of each audio amplifier. The power efficiency of class D audio amplifiers with IRS D900 type larger than class AB audio amplifiers with Apex B500 type. The efficiency value of class D audio amplifiers at the highest output power reaches 87% while class AB audio amplifiers are only 73%.

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

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

Modelling and analysis of a high-performance Class D audio amplifier using unipolar pulse-width-modulation

2012 ◽  
Vol 99 (2) ◽  
pp. 163-177 ◽  
Author(s):  
Zekun Zhou ◽  
Yue Shi ◽  
Xin Ming ◽  
Bo Zhang ◽  
Zhaoji Li ◽  
...  
Keyword(s):  
Pulse Width ◽  
High Performance ◽  
Pulse Width Modulation ◽  
Audio Amplifier ◽  
Class D ◽  
Unipolar Pulse

scholarly journals High-Efficiency DC–DC Converter with Charge-Recycling Gate-Voltage Swing Control

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 899 ◽  
Author(s):  
Jung-Duk Suh ◽  
Yeong-Ho Yun ◽  
Bai-Sun Kong
Keyword(s):  
Gate Voltage ◽  
Power Efficiency ◽  
High Efficiency ◽  
Cmos Technology ◽  
Test Chip ◽  
Efficient Manner ◽  
Light Load ◽  
Charge Recycling ◽  
Voltage Swing ◽  
Full Swing

This paper proposes a high-efficiency DC–DC converter with charge-recycling gate-voltage swing control with a light load. By achieving a variable gate-voltage swing in a very efficient manner by charge recycling, the power efficiency has been substantially improved due to the lower power consumption and the achieved balance between the switching and conduction losses. A test chip was fabricated using 65-nm CMOS technology. The proposed design reduces the gate-driving loss by up to 87.7% and 47.2% compared to the conventional full-swing and low-swing designs, respectively. The maximum power conversion efficiency was 90.3% when the input and output voltages are 3.3 V and 1.8 V, respectively.

scholarly journals Design of Novel Low-Power and High-Efficiency Class-d Audio Amplifier

2017 ◽  
Vol 10 (3) ◽  
pp. 53-64
Author(s):  
Mohammad Mahdi Hajhashemkhani ◽  
Abdalhossein Rezai ◽  
Ahmad Karimi
Keyword(s):  
Low Power ◽  
High Efficiency ◽  
Audio Amplifier ◽  
Class D
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