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ECE3161 Analogue Electronics - MUM S2 2025

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Q1. Find the closed loop gain and output impedance

A non-inverting amplifier employs an op-amp with a finite loop gain A_0A_0 , and output impedance R_{\text{out}}R_{\text{out}}, as shown below. Find the closed loop gain v_{out}/v_{in}v_{out}/v_{in} and output impedance.

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Q9. Determine the current and output impedance

The non-ideal op-amp with gain A=50000A=50000, but with infinite input resistance and zero output resistance below is used to increase the overall output resistance of NPN current source below. Find the current I_CI_C and the output resistance, R_{out}R_{out}.

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Q8. Determine the current and output impedance

For the NPN current source below, determine the current I_CI_C and output resistance R_{out}R_{out}  as indicated on the diagram.

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Q9. Determine the current and the emitter resistance

For the current source below, determine the Zener current I_ZI_Z, and the BJT's emitter resistance R_ER_E if I_0 = 2\text{mA}I_0 = 2\text{mA}.

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Q6. Determine the current and output impedance

Consider the NMOS current source below. Find the current I_DI_D and the output resistance R_{out}R_{out} as indicated on the diagram.

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Q5. Determine the current and output impedance

For the PMOS current source below, determine the current I_DI_D and the output resistance R_{out}R_{out} as indicated on the diagram.

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Q7. Determine the current and output impedance

The non-ideal op-amp with gain A=50000A=50000, but with infinite input resistance and zero output resistance below is used to increase the overall output resistance of NMOS current source below. Find the current I_DI_D and the output resistance, R_{in}R_{in}.

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Q4. Determine the current

Two different NMOS transistors with exactly the same threshold voltage form a current mirror like circuit connections as shown below. Determine the current I_DI_D.

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Q3. Determine the current

For the current mirror below, determine the current  I_{REF}I_{REF}.

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Q2. Determine the current

For the current mirror below, determine the current  I_{REF}I_{REF}.

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