Exercises in Electronics: Operational Amplifier Circuits

Contents

Exercises

Circuits with ideal OpAmps

Circuits with non- ideal OpAmps

Filter Circuits

Schmitt- Trigger Circuits

Solutions

Circuits with ideal OpAmps

Circuits with non- ideal OpAmps

Filter Circuits

Schmitt- Trigger Circuits

1. Circuits with ideal OpAmps

1.1 OpAmp for temperature measurement

The AD590 is a temperature sensor, which provides an impressed current of 1µA/K.

) Calculate UA = f(T1,T2). Neglect the influences of R1 and R2.

) What are R1, R2 and R4 for? Calculate their influence to UA.

1.2 OpAmp as voltage reference

1.3 Limited integrator

This circuit provides limited integrator. There is UI < 0.

) Identify the blocks ‘integrator ‘ and ‘limitation’ in the circuit.

) Draw the characteristic UD = f(UO).

) Mark the areas in the drawing of b.), where the Diode D is conducting, respectively blocking

) To which value, the voltage UO is limited?

) Complete the circuit, so that positive and negative voltages UO are limited.

1.4 OpAmp circuit

Calculate UO/UI.

1.5 Amplifier circuit, high pass filter

) Calculate