Operational Amplifiers. Chapter 14. Operational Amplifiers.

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Operational Amplifiers

Transcript of Operational Amplifiers. Chapter 14. Operational Amplifiers.

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Operational Amplifiers

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Chapter 14 . Operational Amplifiers

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Operational Amplifiers

• Integrated circuit, also known as op amp .• Wide range of applications . Ideal operational amplifier :

- inverting and non-inverting input terminals .

- common mode signal & differential mode signal

- infinite input impedances

- zero output impedance

- very large open –loop gain .

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14.2 Inverting amplifiers

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Example 14.1 : Analysis of an inverting amplifier

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Exercise 14-17

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Exercise 14-18

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Differentiator Circuit

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Active Filters

• Produce bandpass and bandreject filters without using inductors .

• Inductors are usually large, heavy , costly and generate electromagnetic field .

• Fewer components• Transfer function is insentitive to component tolerances .• Allow a wide range of transfer functions .• Inappropriate for monolithic fabrication .

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Fig. 12.1.2 Filter Types . Fig. 12.2 Ideal transmission characteristics of the four major filter types : (a)

low pass (LP), (b) high pass (HP), (c ) bandpass (BP) and (d) bandstop (BS) .

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Low –pass filter

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Bode PlotsExample 1

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Bode PlotsExample 2

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