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Class-D Digital Audio Amplifier Using 1-bit 4th-order Delta-Sigma Modulation  

Kang, Kyoung-Sik (Dep. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University)
Choi, Young-Kil (Dep. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University)
Roh, Hyung-Dong (Dep. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University)
Nam, Hyun-Seok (Dep. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University)
Roh, Jeong-Gin (Dep. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.45, no.3, 2008 , pp. 44-53 More about this Journal
Abstract
In this paper, we present the design of delta-sigma modulation-based class-D amplifier for driving headphones in portable audio applications. The presented class-D amplifier generates PWM(pulse width modulation) signals using a single-bit fourth-order high-performance delta-sigma modulator. To achieve a high SNR(signal-to-noise ratio) and ensure system stability, the locations of the modulator loop filter poles and zeros are optimized and thoroughly simulated. The test chip is fabricated using a standard $0.18{\mu}m$ CMOS process. The active area of the chip is $1.6mm^2$. It operates for the signal bandwidth from 20Hz to 20kHz. The measured THD+N(total harmonic distortion plus noise) at the $32{\Omega}$ load terminal is less than 0.03% from a 3V power supply.
Keywords
Class-D amplifier; delta-sigma modulator; PWM; SNR; THD+N;
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