Browsing by Author "Yang, Yuan-Han"

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A Dual-Level Dual-Phase Pulse-Width Modulation Class-D Amplifier with 0.001% THD, 112 dB SNR
(2014-01-01)
Yang, Shang-Hsien
;
Yang, Yuan-Han
;
Chen, Ke-Horng
;
Hung, Chung-Chih
;
Wey, Chin-Long
this paper presents a dual-level dual-phase pulse-width modulation (DLDP PWM) Class-D audio amplifier circuit which enhance amplifier linearity and reduce distortion. The proposed DLDP PWM Class-D audio amplifier includes two sets of non-overlapping triangular waves, each at its respectful offset levels. Each set of triangular waves is composed of two 180 degrees out-of-phase triangular waves. The differential power stage consists of 8 power transistors, with voltage swings up to +/- 6V. Simulated results shows that the proposed DLDP PWM Class-D audio amplifier features an SNR up to 105 dB, and the THD is suppressed below 0.001 %, with the 3rd harmonic below -102 dBV.
A Low-THD Class-D Audio Amplifier With Dual-Level Dual-Phase Carrier Pulsewidth Modulation
(2015-11-01)
Yang, Shang-Hsien
;
Yang, Yuan-Han
;
Chen, Ke-Horng
;
Lin, Ying-Hsi
;
Tsai, Tsung-Yen
In this paper, a class-D audio amplifier which combines the advantages of the phase-shifted carrier pulse-width modulation (PWM) and the multiple-level carrier PWM is proposed with a dual-level dual-phase carrier (DLDPC) PWM. The proposed closed-loop amplifier includes a second-order integrator and a DLDPC triangular wave generator. Two sets of 180. out-of-phase triangular waves are used as carriers, and each set has its respective offset voltage level with nonoverlapping amplitude. By performing the double Fourier analysis, it can be found that the linearity can be enhanced and the distortion can be reduced with the proposed modulation. Experimental results show that the proposed fully differential DLDPC PWM class-D audio amplifier features a total harmonic distortion lower than 0.01% with an output voltage swing of +/- 5 V.