16/07/13

Fundamentos de Amplificadores Operacionais

ELT095 – Projetos com Amp. Op. e C.I. Analógicos

Company

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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.

Company

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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.

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

Company

LOGO

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.

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 = ∞

Company

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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.

7 Prof. Paulo Fernando Seixas 16/07/13

vi GmRi

io

vo+

_Ro

+

_vi

Amplificador de Transcondutância

Ideal: Ri = ∞ Ro = ∞

Company

LOGO

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.

8 Prof. Paulo Fernando Seixas 16/07/13

Rm

ii

ii+_Ri

io

vo+

_

Ro

Amplificador de Transresistência

Ideal: Ri = 0 Ro = 0

Company

LOGO

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.

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

LOGO

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.

10 Prof. Paulo Fernando Seixas 16/07/13

O Amplificador Operacional

+_ Ad

Ridio

vo

+Ro

+

_

vi

vi

_

Company

LOGO

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.

11 Prof. Paulo Fernando Seixas 16/07/13

Configuração não inversora

Company

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12 Prof. Paulo Fernando Seixas 16/07/13

O Seguidor de Tensão

Company

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13 Prof. Paulo Fernando Seixas 16/07/13

Configuração inversora

Company

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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.

14 Prof. Paulo Fernando Seixas 16/07/13

Circuito Somador

Company

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15 Prof. Paulo Fernando Seixas 16/07/13

Amplificador de Diferença

Company

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16 Prof. Paulo Fernando Seixas 16/07/13

Integrador

Company

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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

Company

LOGO

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.

19 Prof. Paulo Fernando Seixas 16/07/13

Realimentação

1/26/2010

Company

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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.

20 Prof. Paulo Fernando Seixas 16/07/13

Exercício Analisar o amplificador abaixo, determinando: tipo de realimentação, β, R11, R22,Rif, Rof e Af

Company

LOGO

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