A 280 mW, 0.07% THD+N class-D audio amplifier using a frequency-domain quantizer |
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Authors: | Junghan Lee Tino Copani Terry Mayhugh Jr Bhaskar Aravind Sayfe Kiaei Bertan Bakkaloglu |
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Institution: | 1. Department of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ, 85287, USA 2. Texas Instruments Inc. High Volume Analog Group, Dallas, TX, 75243, USA
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Abstract: | Pulse density modulation (PDM) based class-D amplifiers can reduce non-linearity and tonal content due to carrier signal in pulse width modulation 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. 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, single-bit, class-D audio amplifier is presented with an H-bridge switching power stage, which is designed and fabricated on a 0.18???m CMOS process with 6 layers of metal achieving a total harmonic distortion plus noise (THD+N) of 0.065% and a peak power efficiency of 80% while driving a 4-?? loudspeaker load. The amplifier can deliver the output power of 280 mW. |
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