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| Content Provider | Springer Nature Link |
|---|---|
| Author | Pillonnet, Gael Cellier, Remy Nagari, Angelo Lombard, Philippe Abouchi, Nacer |
| Copyright Year | 2012 |
| Abstract | Audio class-D amplifiers are widely used in industrial and consumer portable electronic devices, such as mobile phones, thanks to their high efficiency. However, these amplifiers have a limited linearity due to their switching behavior and also a limited control bandwidth. To overcome these major drawbacks, this paper introduces a self-oscillating control technique based on the sliding mode theory which combines a large control bandwidth and a spread spectrum technique. A high power supply rejection, which is a crucial parameter in modules directly connected to a noisy battery, has also been achieved by introducing a variable hysteresis window. Theoretical analysis, behavioral and electrical simulations are discussed in detail in this paper. An integrated circuit using 0.13 μm CMOS process has been realized focused on mobile phone applications (0.8 W, 3.6 V and 8 Ω). The audio amplifier achieves 97 dB(A) signal-to-noise ratio, 0.02 % harmonic distortion and up to 80 dB of power supply rejection. The die area is smaller than 0.4 mm2 while keeping more than 90 % efficiency at 1 W. |
| Starting Page | 439 |
| Ending Page | 451 |
| Page Count | 13 |
| File Format | |
| ISSN | 09251030 |
| Journal | Analog Integrated Circuits and Signal Processing |
| Volume Number | 74 |
| Issue Number | 2 |
| e-ISSN | 15731979 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2012-12-07 |
| Publisher Place | Boston |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Switching audio amplifier Class D Self-oscillating Sliding mode control Circuits and Systems Electrical Engineering Signal, Image and Speech Processing |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Signal Processing Hardware and Architecture |
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