Modeling of the small-signal dynamic behavior of the TL081H

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Modeling of the small-signal dynamic behavior of the TL081H#

Exercise#

Download the data sheet of the TL081H and design an equaivalent circuit for this operational amplifier that models the following aspects of its small-signal dynamic behavior over a frequency range from DC to 10MHz:

  1. The voltage gain

  2. The differential-mode input impedance

  3. The common-mode input impedance

  4. The output impedance

Solution#

Definition of the differential-mode input impedance

Definition of the differential-mode input impedance#

Definition of the common-mode input impedance

Definition of the common-mode input impedance#

Specification of the DC voltage gain and the differential-mode and common-mode input impedance of the TL081H

Specification of the DC voltage gain and the differential-mode and common-mode input impedance of the TL081H#

Definition of the differential-mode voltage gain

Definition of the differential-mode input voltage gain#

Bode plots of the voltage gain of the TL081H

Bode plots of the voltage gain of the TL081H#

Definition of the output impedance

Definition of the output impedance#

Magnitude plot of the output impedance of the TL081H

Magnitude plot of the output impedance of the TL081H#

Small-signal model of a "voltage feedback" operational amplifier

Small-signal model of a "voltage feedback" operational amplifier#

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