scholarly journals An Energy-Efficient Integration of a Digital Modulator and a Class-D Amplifier

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1319
Author(s):  
Muhammad Yousuf Irfan Zia ◽  
Raúl Tierno ◽  
Miguel-Ángel Luque-Nieto ◽  
Pablo Otero
Keyword(s):  
Power Amplifier ◽  
Energy Efficient ◽  
Pulse Width Modulation ◽  
Cost Effective ◽  
Theoretical Concept ◽  
Integrated System ◽  
Class D Amplifier ◽  
Class D ◽  
Shift Keying ◽  
Efficient Integration

Energy consumption is always a key feature in devices powered by electric accumulators. The power amplifier is the most energy-demanding module in mobile devices, portable appliances, static transceivers, and even nodes used in underwater acoustic networks. These devices incorporate a modulator, typically a pulse-width modulation (PWM) and a class-D power amplifier, for higher efficiency. We propose a technique to integrate the modulator of a transmitter and PW-modulator of a class-D amplifier to improve the overall efficiency of the system. This integrated set operates as an up-converter, phase modulator (PM), and binary phase-shift keying (BPSK) modulator under certain conditions. The theoretical concept is verified using Matlab and a model is designed and simulated in Simulink. For validation purposes, an electronic circuit is built and tested using Multisim. The results obtained by simulations and circuit implementation show that the proposed integrated system is an energy-efficient and cost-effective solution compared to conventional techniques.

A High-Efficiency Cascade Multilevel Class-D Amplifier

2012 ◽  
Vol 482-484 ◽  
pp. 559-564
Author(s):  
Guo Hua Xu ◽  
Ying Zhang ◽  
Ming Dong ◽  
Lu Wei Xu
Keyword(s):  
Sliding Mode Control ◽  
Power Amplifier ◽  
High Efficiency ◽  
Sliding Mode ◽  
Mathematic Model ◽  
Total System ◽  
Mode Control ◽  
Class D Amplifier ◽  
Class D ◽  
The Individual

A switch-mode power amplifier based on a cascaded multicell multilevel circuit topology is introduced in the paper. Due to the Carrier-Based phase-shifted modulation of the individual switching cells, the output voltage ripple of the total system is considerably small. Compared with traditional class- AB amplifiers that are very poor at efficiency, the proposed amplifier has the efficiency of 90% at the smaller distortion level. A multilevel class-D amplifier’s mathematic model is analyzed. The paper lays emphasis on the design of the sliding mode control and deducts the parameters, and then develops a 2kW cascade multilevel class-D power amplifier adopting sliding mode control. The research results show that this kind of amplifier increases the system bandwidth, which provides the system with fast following performance and stability, high efficiency, and low THD value of output signals.

Study of Harmonic Suppression Method Based on the Class D Amplifier

2013 ◽  
Vol 273 ◽  
pp. 384-388
Author(s):  
Yu Guo ◽  
Wei Li
Keyword(s):  
Power Amplifier ◽  
Integrated Circuit ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Harmonic Suppression ◽  
Output Terminal ◽  
Class D Amplifier ◽  
Class D ◽  
Small Distortion ◽  
Harmonic Components

Class D power amplifier has the advantages of simple structure, small volume, high efficiency, large output power, and small distortion, therefore is applied widely in the audio power amplifier integrated circuit. But because of existing higher harmonic components, the total harmonic distortion (THD) is high. In this paper, for the characteristics of class D amplifier, a feed-forward control circuit is added to the amplifier output terminal, and a composite filter is used to inhibit output harmonics further. The simulation results show that, the method can reduce the system THD effectively and improve the performance of the amplifier.

Design of a Sawtooth Generator Applied for Class-D Audio Power Amplifier

2012 ◽  
Vol 241-244 ◽  
pp. 693-697
Author(s):  
Zi Yi Liu ◽  
Xing Xing Jing ◽  
Wen Xi
Keyword(s):  
Circuit Design ◽  
Power Amplifier ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Voltage Regulator ◽  
Core Component ◽  
Audio Amplifier ◽  
Class D ◽  
Simulation Results ◽  
Sawtooth Generator

A systematic introduction to principles and advantages of the class-D audio amplifier based on pulse width modulation (PWM) are presented in this paper. The traditional sawtooth generator needs voltage-regulator tube to server as a core component. Against to such a disadvantage a simple way based on the charging and discharging capacitance is proposed to achieve sawtooth generator. The circuit design is based on SIMC 0.18um process. Spectre simulation results show that the sawtooth generator's performance is good. And it suits for the design of class-D audio power amplifier chip.

A dual-level dual-phase pulse-width modulation class-D amplifier with 0.001% THD, 112 dB SNR

2014 ◽  
Author(s):  
Shang-Hsien Yang ◽  
Yuan-Han Yang ◽  
Ke-Horng Chen ◽  
Chung-Chih Hung ◽  
Chin-Long Wey ◽  
...  
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Dual Phase ◽  
Class D Amplifier ◽  
Class D
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