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Design of an audio power amplifier with a notch in the output impedance

Twelkemeijer, R. (2008) Design of an audio power amplifier with a notch in the output impedance.

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Abstract:This report is about the research and design of an audio power amplifier with a notch in the output impedance. A notch in the output impedance could be beneficial if the amplifier is set in parallel with a class D amplifier. In this combination, the amplifier should remove the high frequency switching ripple of the class D amplifier. Investigation of the output impedance with a pole zero analysis determines the theoretical possibilities about a notch in the output impedance. A notch in the output impedance can be created by a peak filter in the amplifier. An amplifier containing a peak filter is designed with ideal components, like transconductances and inductors. Different filters are nvestigated to implement a peak filter in an IC process. These filters are created by ideal switches and capacitors. To evaluate their usability, simulations are done with amplifiers containing those filters in combination with a class D amplifier. The report shows that a notch can be created at the cost of some increase in the distortion. This can be compensated by increasing the power consumption of the amplifier. Also a small peak in the output impedance is introduced. The peak in the output impedance results in a ringing when a step response is applied. Simulations results in the conclusion that it seems not beneficial to use an amplifier with a notch in the output impedance, if the notch should remove the switching ripple of the class D amplifier
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering MSc (60353)
Link to this item:http://purl.utwente.nl/essays/59404
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