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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...
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