Pulse width modulation for class D audio power amplifier in CMOS 0.18um Process with 85% of efficiency

2011 ◽  
Author(s):  
Ziani Messghati ◽  
Yassir Laghzizal ◽  
Hassan Qjidaa
Keyword(s):  
Power Amplifier ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Class D

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.

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 Increasing the time resolution of a pulse width modulator in a class D power amplifier by using delay lines

2014 ◽  
Vol 12 ◽  
pp. 91-94 ◽  
Author(s):  
M. Weber ◽  
T. Vennemann ◽  
W. Mathis
Keyword(s):  
Power Amplifier ◽  
Time Resolution ◽  
Pulse Width ◽  
Audio Signal ◽  
Open Loop ◽  
Delay Lines ◽  
Class D ◽  
Ac Power ◽  
Pulse Width Modulator ◽  
Power Stage

Abstract. In this paper, we present a method to increase the time resolution of a pulse width modulator by using delay lines. The modulator is part of an open loop class D power amplifier, which uses the ZePoC algorithm to code the audio signal which is amplified in the class D power stage. If the time resolution of the pulse width modulator is high enough, ZePoC could also be used to build an high accuracy AC power standard, because of its open loop property. With the presented method the time resolution theoretically could be increased by a factor of 16, which means here the time resolution will be enhanced from 5 ns to 312.5 ps.

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