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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 the transfer function UO/UI.
) The sinusoidal frequency ω is infinite. Calculate │UO/UI│ and the input impedance ZI.
) ω = 0: Calculate │UO/UI│. Explain the function of C1 and C2.

1.6 Circuit with two OpAmps

) Calculate the transfer function UO/UI.
) Calculate the input impedance ZI = UI/II.
) Draw the amplitude response of the system.

Contents

1. Circuits with ideal OpAmps

1.1 OpAmp for temperature measurement

1.2 OpAmp as voltage reference

1.3 Limited integrator

1.4 OpAmp circuit

1.5 Amplifier circuit, high pass filter

1.6 Circuit with two OpAmps