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Class D audio power amplifier design

Author: PengZhuo
Tutor: LanJiaLong
School: University of Electronic Science and Technology
Course: Circuits and Systems
Keywords: Class D audio power amplifier Pulse width modulation No filter Efficiency
CLC: TN722.75
Type: Master's thesis
Year: 2008
Downloads: 419
Quote: 2
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Abstract


The significant advantages of high efficiency Class D audio power amplifier with class AB audio power amplifier . High efficiency will bring many benefits, such as longer battery life , low fever , these advantages it has broad prospects for development in the mobile multimedia devices . This paper analyzes the principle of the various types of audio power amplifier , and compare their advantages and disadvantages , and then focuses on the works of the Class D power amplifier . Class D audio power amplifier without output filter principle basis for comparison with the traditional modulation scheme , and do not need to take into account wave modulation scheme , the design of the overall circuit structure . The this paper 0.5umCMOS craft, power amplifier modules: pre-amplifier, comparator , oscillator drive circuit , a reference current source , voltage feedback loop and overheating, overcurrent, undervoltage , start protection circuit design , and using the Cadence Spectre circuit simulation using Cadence Virtuoso layout design . In order to achieve without filters the modulation scheme , the system uses the symmetrical structure of the fully differential . Op amp circuit dual output , two-way audio signal output inverting PWM modulator comparator and the subsequent drive circuit by one to two traditional modulation scheme , respectively, deal with two inverting audio signal. The pass band of the pre-amplifier design for the audio frequency range, the non - audio components of the input signal is filtered . In order to improve the system power supply rejection ratio , reduce the harmonic distortion , voltage feedback loop design . In order to eliminate the power tube current spikes in the driver stage to introduce the dead time to avoid power tube due to the large current damage . After simulation and debugging of these modules constitute the system , the simulation results show that the system can work, basically meet the requirements of performance indicators .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Amplification technology,the amplifier > Amplifier > Amplifiers: the role of sub- > Power amplifier
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