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MAPA - ELETRÔNICA ANALÓGICA - 52/2023
QUESTÃO 1

Para fazer com que um sinal de áudio possa atingir grandes distâncias é necessário
ampliar sua intensidade, tarefa que os amplificadores de áudio realizam com maestria.
Existem diversas topologias de circuitos que são amplamente utilizadas para que um
sinal de entrada seja elevado várias vezes, na saída de um estágio amplificador. Este
acopla o sinal proveniente de uma fonte de baixa intensidade ao estágio de ganho e,
posteriormente, acopla-o ao sistema de reprodução de áudio, no caso, alto falantes.
O efeito de amplificação resulta em se aplicar ganho ao sinal de entrada para que o
sinal de saída tenha sua amplitude aumentada, ou até mesmo atenuada. No caso dos
amplificadores de áudio é comum encontrarmos diversas topologias que diferenciam-
se de acordo com o projeto e o propósito do amplificador, assim, um amplificador de
áudio utilizado em um smartphone pode ter topologia diferente do amplificador de áudio
A S S E S S O R I A A C A D Ê M I C A
A C A D Ê M I C A
(43) 99668 - 6495
(43) 98816 - 5388
de um palco dedicado a um show musical, assim, existem algumas classes de
amplificadores, a exemplo das classes A, B, AB e D.
Atividade MAPA:
Desenvolver um amplificador de áudio classe AB com transistores bipolares,
amplificando um sinal senoidal, apresentando-se:
- os gráficos dos sinais de entrada e saída, com ganho mínimo de 4 vezes e
- o circuito alimentado em 12 Vcc, admitindo sinal de entrada de 500 mV e frequência
de 200 Hz
.
Sugestão: utilizar o ambiente LTSpice para desenhar o circuito e plotar as curvas.

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MAPA - ELETRÔNICA ANALÓGICA - 52 2023.pdf

  • 1. MAPA - ELETRÔNICA ANALÓGICA - 52/2023 QUESTÃO 1  Para fazer com que um sinal de áudio possa atingir grandes distâncias é necessário ampliar sua intensidade, tarefa que os amplificadores de áudio realizam com maestria. Existem diversas topologias de circuitos que são amplamente utilizadas para que um sinal de entrada seja elevado várias vezes, na saída de um estágio amplificador. Este acopla o sinal proveniente de uma fonte de baixa intensidade ao estágio de ganho e, posteriormente, acopla-o ao sistema de reprodução de áudio, no caso, alto falantes. O efeito de amplificação resulta em se aplicar ganho ao sinal de entrada para que o sinal de saída tenha sua amplitude aumentada, ou até mesmo atenuada. No caso dos amplificadores de áudio é comum encontrarmos diversas topologias que diferenciam- se de acordo com o projeto e o propósito do amplificador, assim, um amplificador de áudio utilizado em um smartphone pode ter topologia diferente do amplificador de áudio A S S E S S O R I A A C A D Ê M I C A A C A D Ê M I C A (43) 99668 - 6495 (43) 98816 - 5388
  • 2. de um palco dedicado a um show musical, assim, existem algumas classes de amplificadores, a exemplo das classes A, B, AB e D. Atividade MAPA: Desenvolver um amplificador de áudio classe AB com transistores bipolares, amplificando um sinal senoidal, apresentando-se: - os gráficos dos sinais de entrada e saída, com ganho mínimo de 4 vezes e - o circuito alimentado em 12 Vcc, admitindo sinal de entrada de 500 mV e frequência de 200 Hz . Sugestão: utilizar o ambiente LTSpice para desenhar o circuito e plotar as curvas.