Bang-bang control Class-D amplifiers: Power-supply noise

被引：14

作者：

Ge, Tong ^{[1
]}

Chang, Joseph S. ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2008年 / 55卷 / 08期

关键词：

bang-bang control Class-D amplifiers; hearing aids; power-supply rejection ratio (PSRR);

D O I：

10.1109/TCSII.2008.921793

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：

In this paper, the bang-bang Control Class-D amplifiers (bang-bang amp) is suggested as an alternative to the incumbent pulsewidth-modulation Class-D amp for low voltage power-critical applications, including hearing aids. The effects of power supply noise, qualified by power-supply rejection ratio (PSRR), on two bang-bang amps, bang-bang Type-I and Type-II, are investigated for low signal bandwidth hearing aid applications and for the usual full audio bandwidth applications. By deriving analytical expressions for PSRR of these amps, the important parameters related to PSRR are analyzed. The analyses are verified by means of HSPICE simulations and by measurements on practical circuits. The relationships derived herein provide good practical insight to the design of bang-bang amps, including how various parameters may be varied/optimized to meet a given PSRR specification.

引用

页码：723 / 727

页数：5

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