A 1-V CMOS audio amplifier for low cost hearing aids

Author

Azzolini, Cristiano ; Boni, Andrea

Author_Institution

Silis s.r.l., Parma

fYear

2008

fDate

Aug. 31 2008-Sept. 3 2008

Firstpage

562

Lastpage

565

Abstract

The paper describes a very low-cost analog audio amplifier IC for hearing aid devices. The amplifier employs an effective offset cancellation analog circuit aimed to ensure a low quiescent consumption even in case of strong mismatch due to silicon manufacturing. The consumption is 500-muA from a 1.3-V battery supply (excluded mic/loudspeaker biasing) but the hearing aid can operate down to 1-V. Measurements confirm that the nominal THD of the circuit is lower than 1-% at 10-mW output power. The die area (including pads) is lower than 1.5-mm² in a standard 0.35-mum CMOS process (high-res poly option).

Keywords

CMOS analogue integrated circuits; audio-frequency amplifiers; harmonic distortion; hearing aids; CMOS audio amplifier; CMOS process; low cost hearing aids; low quiescent consumption; nominal THD; offset cancellation analog circuit; power 10 mW; silicon manufacturing; voltage 1 V; Analog circuits; Analog integrated circuits; Auditory system; Batteries; Costs; Hearing aids; Loudspeakers; Manufacturing; Microwave integrated circuits; Silicon;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2008. ICECS 2008. 15th IEEE International Conference on

Conference_Location

St. Julien´s

Print_ISBN

978-1-4244-2181-7

Electronic_ISBN

978-1-4244-2182-4

Type

conf

DOI

10.1109/ICECS.2008.4674915

Filename

4674915