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Abstract
Audio amplifiers for portable devices need to be
power efficient, therefore Class-D amplifiers are used. These
amplifiers employ a switching output stage, so that they generally
produce a significant amount of EMI. Filtering these frequency
components usually is not an option since the amplifiers have to
be small and lightweight. A reduction of EMI can be achieved by
using spread-spectrum techniques that distribute the emissions
over a wider frequency range. Unfortunately spread-spectrum
techniques can impact the audio performance. This work presents
a test setup for a Class-D prototype to evaluate different spread-spectrum
methods by measurement or even by listening to the
audio output. Using this setup several spread-spectrum methods
are compared in terms of EMI-reduction and audio performance.
power efficient, therefore Class-D amplifiers are used. These
amplifiers employ a switching output stage, so that they generally
produce a significant amount of EMI. Filtering these frequency
components usually is not an option since the amplifiers have to
be small and lightweight. A reduction of EMI can be achieved by
using spread-spectrum techniques that distribute the emissions
over a wider frequency range. Unfortunately spread-spectrum
techniques can impact the audio performance. This work presents
a test setup for a Class-D prototype to evaluate different spread-spectrum
methods by measurement or even by listening to the
audio output. Using this setup several spread-spectrum methods
are compared in terms of EMI-reduction and audio performance.
| Original language | English |
|---|---|
| Title of host publication | 2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC) |
| Publisher | Institute of Electrical and Electronics Engineers |
| Pages | 791 |
| Number of pages | 793 |
| ISBN (Electronic) | 978-1-4673-9494-9 |
| ISBN (Print) | 978-1-4673-8310-3 |
| Publication status | Published - 2016 |
| Event | Asia-Pacific International Symposium on Electromagnetic Compatibility & Signal Integrity (APEMC) - Shenzhen, China Duration: 18 May 2016 → 21 May 2016 |
Conference
| Conference | Asia-Pacific International Symposium on Electromagnetic Compatibility & Signal Integrity (APEMC) |
|---|---|
| Country/Territory | China |
| City | Shenzhen |
| Period | 18/05/16 → 21/05/16 |
Keywords
- Class-D audio amplifier
- spread spectrum modulation
- EMI
- Prototyping
ASJC Scopus subject areas
- Electrical and Electronic Engineering
Treatment code (Nähere Zuordnung)
- Experimental
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