fundamentos de amp. operacionais
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Fundamentos de amplificadores operacionaisTRANSCRIPT
16/07/13
Fundamentos de Amplificadores Operacionais
ELT095 – Projetos com Amp. Op. e C.I. Analógicos
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2 Prof. Paulo Fernando Seixas 16/07/13
Sumário
1. Fundamentos de Amplificadores
2. O Amplificador Operacional
3. Configurações Básicas
4. Realimentação Negativa
5. Realimentação em Circuitos com Amp. Op.
6. Alimentação de Amp. Op.
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3 Prof. Paulo Fernando Seixas 16/07/13
Sumário
7. Exercícios
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4 Prof. Paulo Fernando Seixas 16/07/13
Amplificador de tensão
+_ Avovi Ri
io
vo+
_
Ro+
_vi
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5 Prof. Paulo Fernando Seixas 16/07/13
Efeito de carga
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6 Prof. Paulo Fernando Seixas 16/07/13
Ri
ii
Ais
io
vo+
_Roii
Amplificador de Corrente
Ideal: Ri = 0 Ro = ∞
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7 Prof. Paulo Fernando Seixas 16/07/13
vi GmRi
io
vo+
_Ro
+
_vi
Amplificador de Transcondutância
Ideal: Ri = ∞ Ro = ∞
Company
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8 Prof. Paulo Fernando Seixas 16/07/13
Rm
ii
ii+_Ri
io
vo+
_
Ro
Amplificador de Transresistência
Ideal: Ri = 0 Ro = 0
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9 Prof. Paulo Fernando Seixas 16/07/13
Como converter um modelo em outro?
vi GmRi
io
vo+
_Ro
+
_vi
Ri
ii
Ais
io
vo+
_Roii
Ais = ?
Company
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10 Prof. Paulo Fernando Seixas 16/07/13
O Amplificador Operacional
+_ Ad
Ridio
vo
+Ro
+
_
vi
vi
_
Company
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11 Prof. Paulo Fernando Seixas 16/07/13
Configuração não inversora
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12 Prof. Paulo Fernando Seixas 16/07/13
O Seguidor de Tensão
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13 Prof. Paulo Fernando Seixas 16/07/13
Configuração inversora
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14 Prof. Paulo Fernando Seixas 16/07/13
Circuito Somador
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15 Prof. Paulo Fernando Seixas 16/07/13
Amplificador de Diferença
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16 Prof. Paulo Fernando Seixas 16/07/13
Integrador
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17 Prof. Paulo Fernando Seixas 16/07/13
Diferenciador
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18 Prof. Paulo Fernando Seixas 16/07/13
Resistência negativa
+_
ii
vi Req +
_
+_
R1 R2
R
ii
vi
vo = (1+R2R1)vi
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19 Prof. Paulo Fernando Seixas 16/07/13
Realimentação
1/26/2010
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20 Prof. Paulo Fernando Seixas 16/07/13
Exercício Analisar o amplificador abaixo, determinando: tipo de realimentação, β, R11, R22,Rif, Rof e Af
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The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again.
21 Prof. Paulo Fernando Seixas 16/07/13
Exercício Analisar o amplificador abaixo, determinando: tipo de realimentação, β, R11, R22,Rif, Rof e Af