Übungsblatt 6
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In the following, the transfer function of the differential amplifier is to be calculated. To do this, you should follow a few steps.
- Derive the function $U_{\rm O} = f(U_{\rm I1}, U_{\rm I2})$ using superposition.
- To do this, first draw an equivalent circuit in each case.
- Briefly describe the resulting circuit. Which amplification circuit results in each case?
- Then calculate the voltages $U_{\rm O1}$ and $U_{\rm O2}$, and from them $U_\rm O$.
- Determine the function $U_{\rm O} = f(U_{\rm I1}, U_{\rm I2})$ or the resistance values of the circuit shown.
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Derive the gain for the current-voltage converter, i.e. the transmission resistance. Use the procedure that we used for the other amplifiers.
- Draw a circuit with the relevant voltages, currents, resistances, and the operational amplifier
- What are you looking for?
- What is the number of variables
- What is the number of equations required?
- Establishing the known equations.
- Derivation of the transmission resistance.
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Derive the "amplification" for the voltage-to-current converter, i.e. the transfer conductance. Use the same procedure that we used for the other amplifiers.
- Draw a circuit with the relevant voltages, currents, resistances, and the operational amplifier.
- What are you looking for?
- What is the number of variables?
- What is the number of necessary equations?
- Establishing the known equations.
- Derivation of the transfer conductance.
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If the voltage-current converter is used as a current source, it must be ensured that the load has no contact with the ground.
- Draw the voltage-to-current transformer with a load that is in contact with the ground.
- Why is in this case the slope derived above no longer valid as an amplification factor?
- Will the output current be higher or lower in this case?