A Feed-Forward Power-Supply Noise Cancellation Technique for Single-Ended Class-D Audio Amplifiers

被引:16
作者
Colli-Menchi, Adrian I. [1 ]
Torres, Joselyn [1 ]
Sanchez-Sinencio, Edgar [1 ]
机构
[1] Texas A&M Univ, Dept Elect & Comp Engn, Analog & Mixed Signal Ctr, College Stn, TX 77843 USA
关键词
Audio amplifier; class-D amplifier; direct battery hookup; efficiency; feed-forward path; headphone amplifier; linearity; noise cancellation; power-supply rejection ratio (PSRR); supply ripple cancellation; CLASS-D AMPS; PSRR; DESIGN;
D O I
10.1109/JSSC.2014.2298456
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper presents a feed-forward power-supply noise cancellation technique to achieve high power-supply rejection ratio (PSRR) in single-ended class-D audio amplifiers. To show the effectiveness of the technique, it is implemented on a first-order single-ended pulse-width modulation (PWM) class-D amplifier. The implemented technique improves the PSRR from 20 Hz to 20 kHz independently of the close-loop compensator's filter-order. The design methodology, implementation, and trade-offs for the proposed technique are provided. The fabricated class-D audio amplifier achieves a PSRR of 83 dB at 217 Hz, THD+N of 0.0149%, and a maximum efficiency of 94.6% from a 1.8-V power supply. Experimental results show a PSRR improvement of 33 dB from 20 Hz to 20 kHz compared to a similar amplifier designed without the technique. The prototype was implemented using 0.18-mu m CMOS standard technology, and occupies a total area of 0.121 mm(2). The total quiescent power consumption was 356 mu W. The feed-forward power-supply noise cancellation technique enhances single-ended structures to achieve a PSRR performance comparable to differential architecture, and at the same time it consumes small quiescent power with a reduced active silicon area overhead.
引用
收藏
页码:718 / 728
页数:11
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