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ECE3161 Analogue Electronics - MUM S2 2025

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Q1. Determine the current

For the current mirror below, determine the current I_0I_0.

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Q10. Find the input capacitance

For the small signal circuit given below, estimate the input capacitance as seen from the terminal GG using the Miller's method. 

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Q9. Find the input pole

For the amplifier below, determine the input pole frequency (in rad/srad/s). Note that the transistors are identical and have the values, C_{\mu} = 0.5C_{\mu} = 0.5 pF,  and the transition frequency f_T = 400f_T = 400 MHz. The C_{\mu}C_{\mu} and C_{\pi}C_{\pi} obey the relation C_{\mu} + C_{\pi} = \frac{g_m}{2\pi f_T}C_{\mu} + C_{\pi} = \frac{g_m}{2\pi f_T}. Assume that the 0.4mA current source provides 0.2mA current to each transistor at bias conditions. 

 

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Q8. Find the output waveform

If the op-amp below has the following frequency response \frac{A_0}{(1+\frac{s}{\omega_0})}\frac{A_0}{(1+\frac{s}{\omega_0})} for its differential gain, determine the output waveform v_{out}(s)v_{out}(s). Here ss is the Laplace variable. 

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Q7. Find the input pole

For the circuit below, find the input pole (in rad/srad/s) using Miller's theorem. Assume that r_or_o is infinity and neglect parasitic capacitances. The current source biasing Q2 transistor is ideal. Assume g_mg_m and r_{\pi}r_{\pi} for Q1 is known. 

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Q6. Estimate the output pole

Use Miller's theorem to estimate the input and output pole (in rad/srad/s) of the circuit shown below. Assume V_A = \inftyV_A = \infty and ignore all the parasitic capacitances. 

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Q5. Find the small signal gain

Consider the common-base amplifier shown below, where the output resistance r_or_o of the NPN BJT is drawn explicitly. Estimate the small signal gain v_{out}/v_{in}v_{out}/v_{in} for this amplifier using the Miller's theorem. In your estimation assume r_or_o is large enough to allow the approximation v_{out}/v_{x} = g_m R_C v_{out}/v_{x} = g_m R_C when you apply Miller's theorem to simplify the circuit. 

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Q4. Find the input impedance of the circuit

The BJT transistor circuit below is shown with its parasitic capacitance C_{\pi}C_{\pi},  C_{\mu}C_{\mu} and  C_{\text{CS}}C_{\text{CS}}. Find the input impedance Z_{in}(s)Z_{in}(s) using Miller's theorem. Assume \beta\beta and g_mg_m given for this setup. Here ss is the Laplace variable. 

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Q3. Find the input resistance

For the ideal op-amp circuit given below, using Miller's theorem, find the input resistance R_{in}R_{in} as indicated?

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Q2. Find the output waveform

If the input to the op-amp circuit below is A\text{sin}(\omega t) + B\text{cos}(2 \omega t)A\text{sin}(\omega t) + B\text{cos}(2 \omega t) where AA and BB are constants, and \omega\omega is the angular frequency, what is the output waveform? Assume that the op-amp input impedance is infinite but it has a frequency dependent differential gain given by \frac{G\omega_0}{(\omega_0+j \omega)}\frac{G\omega_0}{(\omega_0+j \omega)} , where GG is a constant and \omega_0\omega_0 is a constant. 

Figure_corrected_Q2_Week5

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