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Design and Analysis of a Self-Oscillating Class D Audio Amplifier Employing a Hysteretic Comparator

Design and Analysis of a Self-Oscillating Class D Audio Amplifier Employing a Hysteretic Comparator,10.1109/JSSC.2011.2161415,IEEE Journal of Solid-st

Design and Analysis of a Self-Oscillating Class D Audio Amplifier Employing a Hysteretic Comparator  
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A third-order self-oscillating class D audio amplifier that utilizes a hysteretic comparator is presented. The design is an- alyzed and its THD is theoretically determined by employing an equivalent model, that relates the approach to natural sampling pulse-width modulation. The architecture eliminates the require- ment for a high-quality carrier generator. A low-cost hysteresis compensation technique is utilized to enhance distortion perfor- manceathighoutputpowerlevels.Animplementationispresented in a 0.7 mC MOS process.It achieves a dynamic range (DR) of 116.5 dB, and a THD+N of 0.0012%, while delivering a power of 125mWintoan8 loadat1kHz.TheTHD+Nisunder0.006%up to 90% of the maximum output power. The amplifier can deliver 1.45 W into the load with a THD of 5% with a 5 V power supply. The efficiency is greater than 84% for output power larger than 1 W. The area of the amplifier is 6 mm . Index Terms—Audio power amplifier, class D, efficiency, hys- teresis,hysteresiscompensation,hystereticcomparator,lowdistor- tion,pulsewidthmodulation,PWM,self-oscillating,SNR,stability, THD.
Journal: IEEE Journal of Solid-state Circuits - IEEE J SOLID-STATE CIRCUITS , vol. 46, no. 10, pp. 2336-2349, 2011
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