Realization of a digital PWM power amplifier using noise and ripple shaping

Author

Smith, Mark K. ; Smedley, Keyue M. ; Ma, Yunhong

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA

Volume

1

fYear

1995

fDate

18-22 Jun 1995

Firstpage

96

Abstract

A digital pulse width modulation technique featuring noise and ripple shaping (NRS) for audio power amplification is realized. The sampled and extrapolated power source amplitude signal is used to shape the interpolated input digital signal. This shaped signal is fed to a noise shaper to produce a reduced bit digital signal fully representing 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. A digital signal processor controlled full bridge power amplifier was built with close to 5 kHz bandwidth and 40 dB ripple rejection improvement at 60 Hz over conventional PWM power amplifiers

Keywords

PWM power convertors; audio-frequency amplifiers; bridge circuits; digital signal processing chips; interference (signal); power amplifiers; power supplies to apparatus; signal processing; 50 kHz; 60 Hz; DC power regulators; digital PWM power amplifier; digital pulse width modulation; digital signal processor; extrapolated power source amplitude signal; full bridge power amplifier; interpolated input digital signal; noise shaper; noise shaping; power source ripple; reduced bit digital signal; requantization error; ripple shaping; Digital modulation; Noise reduction; Noise shaping; Power amplifiers; Power generation; Pulse amplifiers; Pulse shaping methods; Pulse width modulation; Regulators; Space vector pulse width modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1995. PESC '95 Record., 26th Annual IEEE

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-2730-6

Type

conf

DOI

10.1109/PESC.1995.474798

Filename

474798