A -109.1 dB/-98 dB THD/THD+N Chopper Class-D Amplifier with >83.7 dB PSRR Over the Entire Audio Band
Huajun Zhang (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Nuriel Rozsa (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Marco Berkhout (Goodix Technology)
Qinwen Fan (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
This paper reports a chopper Class-D audio amplifier that obtains high PSRR over the entire audio band. A chopping scheme is proposed to minimize intermodulation distortion between pulse-width modulation (PWM) and chopping in the audio band. A high-voltage chopper is developed to handle a 14.4 V PWM signal. Timing matching techniques are proposed to minimize chopping nonidealities which ensure good PSRR and THD. Fabricated in a 180nm BCD process, the prototype obtains a PSRR >109 dB at 217 Hz and >83.7 dB over the entire audio band. It also achieves -109.1 dB/-98 dB THD/THD+N and can deliver a maximum of 13 W to an 8-Ω load.