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lab05_en:inverting_op-amp_basics_amplification [2026/04/28 15:43] – [Analysis of inverting input currents] mexleadminlab05_en:inverting_op-amp_basics_amplification [2026/05/07 12:45] (current) – mexleadmin
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-$U_{\rm DD}{\rm~=10~V},~U_{\rm SS}{\rm~=-10~V},~R_{\rm 1}{\rm~=10~k\Omega}$+$U_{\rm DD}{\rm~=10~V},~U_{\rm SS}{\rm~=-10~V},~R_{\rm 1}{\rm~=100~k\Omega}$
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-Calculate the necessary value for $R_{\rm 2}$, so that the Output $U_{\rm OUT}$ is +5 V.+Calculate the necessary value for $R_{\rm 2}$, so that the output $U_{\rm OUT}$ is +1.5 V.\\
 Use the supply voltage of the operational amplifier for $U_{\rm IN}$. Use the supply voltage of the operational amplifier for $U_{\rm IN}$.
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 == Analysis of inverting input currents == == Analysis of inverting input currents ==
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 {{drawio>lab05:Fig-30_inverting_op-amp_inv_input.svg}} {{drawio>lab05:Fig-30_inverting_op-amp_inv_input.svg}}
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-<imgcaption Fig-30_inverting_op-amp_inv_input | Inverting Op-Amp: Investigate currents of the inverting input> </imgcaption>+<imgcaption Fig-30_inverting_op-amp_inv_input | Inverting Op-Amp: Analysis of currents of the inverting input> </imgcaption>
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-$U_{\rm DD}{\rm~=10~V},~U_{\rm SS}{\rm~=-10~V},~R_{\rm 1}{\rm~=10~k\Omega}$\\ \\+$U_{\rm DD}{\rm~=10~V},~U_{\rm SS}{\rm~=-10~V},~R_{\rm 1}{\rm~=100~k\Omega}$\\
 Use the values from <imgref Fig-20_inverting_op-amp> for $U_{\rm IN},~U_{\rm OUT},~R_{\rm 2}$. Use the values from <imgref Fig-20_inverting_op-amp> for $U_{\rm IN},~U_{\rm OUT},~R_{\rm 2}$.
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-\\ +Complete the reference arrows in the scematic of the circuit.\\
-Complete the arrows in the scematic of the circuit.\\+
 Determine the the currents $I_{\rm 1}$ and $I_{\rm 2}$ indirectly by measuring the voltage across known resistors\\ Determine the the currents $I_{\rm 1}$ and $I_{\rm 2}$ indirectly by measuring the voltage across known resistors\\
 and calculate the algebraic sum of the currents at node $N_{\rm {12}}$ using Kirchhoff’s Current Law (KCL). and calculate the algebraic sum of the currents at node $N_{\rm {12}}$ using Kirchhoff’s Current Law (KCL).
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-$U_{\rm 2}{\rm~=}$\\+$U_{\rm 2}{\rm~=}$
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 +$I_{\rm 1}{\rm~=}$
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 +$I_{\rm 2}{\rm~=}$
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-$I_{\rm 1}{\rm~=}$ 
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-$I_{\rm 2}{\rm~=}$ 
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 $I_{\rm N12}{\rm~=}$ $I_{\rm N12}{\rm~=}$
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 == Analysis of inverting input voltages == == Analysis of inverting input voltages ==
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-<imgcaption Fig-40_inverting_op-amp_inv_input_virt_gnd | Inverting Op-Amp: Investigate the virtual GND of the inverting input> </imgcaption>+<imgcaption Fig-40_inverting_op-amp_inv_input_virt_gnd | Inverting Op-Amp: Analysis of virtual GND of the inverting input> </imgcaption>
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-$U_{\rm DD}{\rm~=10~V},~U_{\rm SS}{\rm~=-10~V},~R_{\rm 1}{\rm~=10~k\Omega}$\\ \\+$U_{\rm DD}{\rm~=10~V},~U_{\rm SS}{\rm~=-10~V},~R_{\rm 1}{\rm~=100~k\Omega}$\\
 Use the values from <imgref Fig-20_inverting_op-amp> for $U_{\rm IN},~U_{\rm OUT},~R_{\rm 2}$. Use the values from <imgref Fig-20_inverting_op-amp> for $U_{\rm IN},~U_{\rm OUT},~R_{\rm 2}$.
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 Complete the reference arrows in the scematic of the circuit.\\ Complete the reference arrows in the scematic of the circuit.\\
 Take the values for $U_{\rm 1},~U_{\rm 2},~U_{\rm OUT}$ from <imgref Fig-30_inverting_op-amp_inv_input>.\\ Take the values for $U_{\rm 1},~U_{\rm 2},~U_{\rm OUT}$ from <imgref Fig-30_inverting_op-amp_inv_input>.\\
-Calculate the voltage $U_{12}$ using Kirchhoff's Voltage Law (KVL) within the circuit loop.\\+Calculate the voltage $U_{12}$ using Kirchhoff's Voltage Law (KVL) within one of the possible circuit loops. Mark the chosen loop in the circuit.\\
 Verify your calculated result by measuring $U_{12}$. Verify your calculated result by measuring $U_{12}$.
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 $U_{\rm 2}{\rm~=}$ $U_{\rm 2}{\rm~=}$
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 +$U_{\rm IN}{\rm~=}$
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 Measured $U_{\rm 12}{\rm~=}$ Measured $U_{\rm 12}{\rm~=}$
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-Analyze the physical significance of the potential at $N_{12}$ relative to GND (defined as $U_{12}$) in the context of the operational amplifier's input configuration. What do you observe?\\+\\ 
 +Analyse the physical significance of the potential at $N_{12}$ relative to GND (defined as $U_{12}$) in the context of the operational amplifier's input configuration. What do you observe?\\
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 ${\rm ................................................................................................}$ \\ \\ ${\rm ................................................................................................}$ \\ \\