A low voltage and high efficiency class D amplifier based on sima-delta modulator designed for hearing-aids applications / Amplificador de audio classe D baseado em modulação sigma-delta destinado a aparelhos auditivos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

This thesis presents the design of a firstorder ?-? audioband power amplifier optimized for hearing aid (HA) amplification. The majority of HAs use a 1.1V battery and require very low current consumption to improve battery life. This work made use of amplifiers and comparators based on CMOS inverters because such an inverter, with a 1.1V battery, can operate on a current as low as 400nA, depending on its dimensions, and provide high voltage gain when biased in their linear region. For these reasons, they can substitute with advantage operational amplifiers in some applications. A prototype of this circuit was implemented in a monolithic chip using 0.35?m CMOS technology and achieved 90% of power efficiency

ASSUNTO(S)

class-d semicondutores complementares de oxido metalico aparelhos auditivos high efficience cmos amplifier sigma-delta modulação sigma-delta audio inverter amplificadores de audio frequencia microeletronica low voltage modulation

ACESSO AO ARTIGO

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