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Cross-Over Distortion Reduction On 3 Level Pwm For Audio Amplifiers
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| Author(s) |
Victor Antunes, V. Fernao Pires, J. Fernando Silva |
| Abstract |
A new control/modulation method for digital audio
power amplifiers is proposed. With this approach the
cross-over harmonic distortion is reduced. The use of
three-level PWM output voltage instead of two-level is another
characteristic of this approach. From the use of the three-level
two main advantages can be obtained: more resolution and
increased efficiency. However, there is an important
disadvantage: higher cross-over distortion and worst THD+N
for signals with small amplitude, than the obtained with two
level PWM output voltage. Therefore, to overcome this
disadvantage the proposed control/modulation method uses
three-level PWM output voltage for signals with large
amplitude and two-level for signals with small amplitude. This
allows the construction of a completely digital audio power
amplifier with better efficiency than those using two-level
PWM output, with comparable THD+N. |
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| Filename: | A31214 |
| Filesize: | 365.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-02-16 by System |
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