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ECE3161 Analogue Electronics - MUM S2 2025

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Q8. Determine the oscillation frequency

Find the oscillation frequency of the op-amp oscillator below. 

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Q7. Determine the oscillation frequency

Consider the oscillator below which is driven by a dependent current source.  Assuming sufficient g_mg_m there to sustain oscillations, find the oscillation frequency in rad/s?

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Q6. Determine the oscillation frequency

The oscillation frequency of an LC oscillator is given by f= \frac{1}{2\pi\sqrt{LC}}f= \frac{1}{2\pi\sqrt{LC}}, where LL and CC are the values of the inductor and capacitor setting the oscillation. For the oscillator below. find the oscillation frequency. 

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Q5. Determine the component values 

The oscillation frequency of an LC oscillator is given by f= \frac{1}{2\pi\sqrt{LC}}f= \frac{1}{2\pi\sqrt{LC}}, where LL and CC are the values of the inductor and capacitor setting the oscillation. For the oscillator below. find the values of LL and R_fR_f so that the oscillation frequency is 5\text{kHz}5\text{kHz}

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Q4. Determine the oscillation frequency (angular frequency) and a filter parameter

A sinusoidal oscillator consists of an amplifier having a positive, frequency-independent gain A connected in a feedback loop with a second order bandpass filter having the transfer function T(s) = \frac{(\frac{\omega_0}{Q})sK}{s^2 + (\frac{\omega_0}{Q})s + \omega_0^2}T(s) = \frac{(\frac{\omega_0}{Q})sK}{s^2 + (\frac{\omega_0}{Q})s + \omega_0^2} , where ss is the Laplace variable, and KK, \omega_0\omega_0, and QQ are positive constants. Find the frequency of oscillation and the minimum value of KK must have for sustained oscillations. 

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Q3. Determine the gain and phase to sustain oscillations

A negative feedback system is shown below. Under what conditions does the system oscillate?

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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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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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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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