Very low-cost CMOS audio amplifier for 1-V portable applications

Author

Azzolini, Cristiano ; Ricciardi, Antonio ; Boni, Andrea

Author_Institution

Univ. of Parma, Parma

fYear

2008

fDate

25-27 March 2008

Firstpage

1

Lastpage

4

Abstract

The design of a very low-cost full-analog audio amplifier IC for hearing aid devices is presented. The overall circuit consumes 460-muA from a 1.3-V battery supply (excluded loudspeaker, without signal) but the hearing aid is able to operate with a depleted battery down to 1-V. The nominal THD of the circuit is lower than 1-% at 10-mW output power whereas the input referred equivalent noise voltage is 3.2-muV_RMS. An effective analog offset cancellation circuit ensures a low quiescent power consumption in case of strong process mismatch. The silicon area is as low as 1.5-mm² in a 0.35-mum CMOS process.

Keywords

CMOS analogue integrated circuits; audio-frequency amplifiers; hearing aids; integrated circuit design; CMOS audio amplifier; analog offset cancellation circuit; current 460 muA; full-analog audio amplifier IC design; hearing aid devices; portable applications; power 10 mW; size 0.35 mum; voltage 1 V; voltage 1.3 V; Auditory system; Batteries; Circuit noise; Energy consumption; Loudspeakers; Noise cancellation; Power amplifiers; Power generation; Silicon; Voltage; CMOS audio amplifiers; Low-voltage amplifier; class AB amplifiers; low-cost hearing aid; offset cancellation circuit;

fLanguage

English

Publisher

ieee

Conference_Titel

Design and Technology of Integrated Systems in Nanoscale Era, 2008. DTIS 2008. 3rd International Conference on

Conference_Location

Tozeur

Print_ISBN

978-1-4244-1576-2

Electronic_ISBN

978-1-4244-1577-9

Type

conf

DOI

10.1109/DTIS.2008.4540229

Filename

4540229