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Digital sampling process for audio class D, pulse width modulated, power amplifiers

Digital sampling process for audio class D, pulse width modulated, power amplifiers

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Digital audio class D amplifiers require a digital process to convert the sampled audio signal into a pulse width modulated (PWM) signal. The present methods of generating PWM are either analogue (natural sampling) and are unsuitable for digital systems or use a digital process (uniform sampling) which introduces excessive distortion. An alternative sampling process is described which is suitable for digital implementation yet introduces the low levels of distortion usually associated with natural sampling.

References

    1. 1)
      • J.D. Martin . Theoretical efficiencies of class D amplifiers. Proc. IEE , 1089 - 1090
    2. 2)
      • S.P. Leigh , P.H. Mellor , B.M.G. Cheetham . Distortion minimisation in pulse-width modulated systems using a digital sampling process. Electron. Lett. , 16 , 1310 - 1311
    3. 3)
      • P.H. Mellor , S.P. Leigh , B.M.G. Cheetham . Reduction of spectral distortion in class D amplifiers by an enhanced pulse width modulation sampling process. IEE Proc. G , 4 , 441 - 448
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