Title :
Digital-PWM audio power amplifiers with noise and ripple shaping
Author :
Smedley, Keyue M.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA
Abstract :
This paper presents a digital pulse width modulation (PWM) technique featuring noise and ripple shaping for audio power amplification. The sampled power-source amplitude signal is used to shape the interpolated input digital signal, which is fed to a noise shaper to produce a lower bit digital signal to represent the original signal. The output power signal is not affected by the requantization error or the power-source ripple. Therefore, DC power regulators can be eliminated without sacrificing the signal-to-noise ratio. Spectral analysis is provided for double edge uniform sampling modulation
Keywords :
audio-frequency amplifiers; digital circuits; interpolation; power amplifiers; pulse width modulation; spectral analysis; AF amplifier; digital-PWM audio power amplifiers; double edge uniform sampling modulation; interpolated input digital signal; noise shaping; pulse width modulation; ripple shaping; sampled power-source amplitude signal; spectral analysis; Digital modulation; Noise level; Noise shaping; Power amplifiers; Power generation; Pulse amplifiers; Pulse shaping methods; Pulse width modulation; Regulators; Space vector pulse width modulation;
Conference_Titel :
Power Electronics Specialists Conference, PESC '94 Record., 25th Annual IEEE
Conference_Location :
Taipei
Print_ISBN :
0-7803-1859-5
DOI :
10.1109/PESC.1994.349680
