Title :
Very low-cost CMOS audio amplifier for 1-V portable applications
Author :
Azzolini, Cristiano ; Ricciardi, Antonio ; Boni, Andrea
Author_Institution :
Univ. of Parma, Parma
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-muVRMS. 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;
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
DOI :
10.1109/DTIS.2008.4540229
