›› 2012, Vol. 25 ›› Issue (5): 17-.

• Articles • Previous Articles     Next Articles

System Design and Simulation of Class D Amplifier Using ΣΔ Modulator

 GAO Ai-Guo   

  1. (Fourth Divisions,Unit 92853,PLA,Huludao 125106,China)
  • Online:2012-05-15 Published:2012-05-24

Abstract:

In view of the fact that pulse width modulation may cause electromagnetic interference (EMI) in Class D Amplifier,this article applies a five-order low pass Σ Δ modulator to A class D amplifier with a feedback loop structure.The output signal spectrum properties are studied by establishing a nonideal model of class D amplifier.Simulation results show that this model can reduce the noise and harmonic distortion in low frequency band,achieve higher signal-to-noise ratio in baseband.Its application in the class D amplifiers can improve the electromagnetic interference performance effectively compared with traditional pulse width modulation.

Key words: class D amplifier;Σ&Delta, modulation;EMI;power spectrum density

CLC Number: 

  • TN722.7