Title :
A 1-V CMOS audio amplifier for low cost hearing aids
Author :
Azzolini, Cristiano ; Boni, Andrea
Author_Institution :
Silis s.r.l., Parma
fDate :
Aug. 31 2008-Sept. 3 2008
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;
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
DOI :
10.1109/ICECS.2008.4674915
