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A 280 mW, 0.07 % THD+N Class-D Audio Amplifier Using a Frequency-Domain Quantizer


Abstract Pulse Density Modulation- (PDM-) based class-D amplifiers can reduce non-linearity and tonal content due to carrier signal in Pulse Width Modulation - (PWM-) based amplifiers. However, their low-voltage analog implementations also require a linear- loop filter and a quantizer. A PDM-based class-D audio amplifier using a frequency-domain quantization is presented in this paper. The digital-intensive frequency domain approach achieves high linearity under low-supply regimes. An analog comparator and a single-bit quantizer are replaced with a Current-Controlled Oscillator- (ICO-) based frequency discriminator. By using the ICO as a phase integrator, a third-order noise shaping is achieved using only two analog integrators. A single-loop, singl... (more)
Created Date 2011
Contributor Lee, Junghan (Author) / Bakkaloglu, Bertan (Advisor) / Kiaei, Sayfe (Committee member) / Ozev, Sule (Committee member) / Song, Hongjiang (Committee member) / Arizona State University (Publisher)
Subject Electrical engineering / Engineering / Class-D amplifier / Current-Controlled Oscillator / Frequency Discriminator / Frequency-domain Quantization / Pulse Density Modulation / Sigma-Delta Modulation
Type Doctoral Dissertation
Extent 119 pages
Language English
Copyright
Reuse Permissions All Rights Reserved
Note Ph.D. Electrical Engineering 2011
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS


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Description Dissertation/Thesis