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Journal of Applied Sciences
  Year: 2014 | Volume: 14 | Issue: 14 | Page No.: 1643-1647
DOI: 10.3923/jas.2014.1643.1647
 
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Improved LC Filter in Class D Amplifier using Simulated Inductor

D. Susan and S. Jayalalitha

Abstract:
Class D audio power amplifiers are used to amplify the audio signal as this amplifier has the main advantage of low power dissipation. It makes use of the passive filter at the output stage to eliminate the high frequency components present in the modulated output and to get back the amplified audio signal. This passive filter makes use of inductors and capacitors. The size of the inductor becomes exceedingly large due to more number of turns required at audio frequencies. To eliminate the passive component namely the inductor used in this filter, a new technique of replacing L by the simulated L, which makes use of the active devices along with resistors and capacitors is proposed in this study. It eliminates most of the disadvantages of passive filter and gives an improved performance of the filter as well as faithful amplification from class D amplifier. The simulation is done in PSPICE and results are presented.
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