Title :
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
fDate :
12/1/1996 12:00:00 AM
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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
