(a) The circuit shown in Figure Q4(a) is an oscillator. For this circuit: RF RA Vo R VF C ER Figure Q4(a) VE Derive the expression for the feedback network, ß =- Vo (i) (ii) Determine the frequency of oscillation, and (iii) Find the ratio of RF/RA to ensure the condition for oscillation is fulfilled.

(b) Design a non-inverting amplifier to provide a closed loop gain of 60. Draw the schematic and briefly explain its operation. (c) You have built the circuit from the previous question (A1 (b)) and are testing its output for an AC input signal with 10 mV peak amplitude. The output signal measured on the oscilloscope has peak amplitude of approximately 420 mV. Assuming your measurements are correct, is this what you expected? Provide a possible justification for this result.

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If in the oscillator block diagram shown in Figure, = 0.1V, A = 100 and m = 0.01, then the circuit will. V₁ mVo Voltage Gain A Feedback Circuit V