A high-efficiency 4×20 W monolithic audio amplifier for automobile radios using a complementary D-MOS BCD technology

Author

Botti, Edoardo ; Mandrini, Tiziana ; Stefani, Fabrizio

Author_Institution

SGS-Thomson Microelectron., Milan, Italy

Volume

31

Issue

12

fYear

1996

fDate

12/1/1996 12:00:00 AM

Firstpage

1895

Lastpage

1901

Abstract

A monolithic quad audio power amplifier which reduces power dissipation by 45% with a music signal compared to a standard class-AB amplifier is described. A new two-stage operational amplifier, capable of providing high output current, is used for each one of eight power amplifiers. In a bridge configuration, a common-loop mode control is performed exploiting a sample-and-hold circuit. A multipower bipolar-CMOS-DMOS (BCD) technology is employed with a push-pull rail-to-rail output stage and a low-loss power switch. Experimental results are presented

Keywords

analogue integrated circuits; audio-frequency amplifiers; bridge circuits; monolithic integrated circuits; operational amplifiers; power amplifiers; radio receivers; 80 W; automobile radios; bridge configuration; common-loop mode control; complementary D-MOS BCD technology; high output current op amp; high-efficiency operation; low-loss power switch; monolithic AF amplifier; monolithic quad audio power amplifier; multipower bipolar-CMOS-DMOS technology; music signal; power dissipation reduction; push-pull rail-to-rail output stage; sample/hold circuit; two-stage operational amplifier; Automobiles; Bridge circuits; High power amplifiers; Operational amplifiers; Power amplifiers; Power dissipation; Power generation; Radio frequency; Radiofrequency amplifiers; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.545810

Filename

545810