For the oscillator circult shown below, C-10 pF and C 150 pF and L-1pH a) Name the type of oscillator b) Should the feedback circuit provide 180° phase shift? Explain why. c) Calculate the frequency of oscillation. d) If the amplifier circuit is biased to provide a gain of 10, will the circuit oscillate? Justify your answer. RFC to0 p 多Res R

Figure 3 shows a Hartley oscillator. Assume that the op-amp employed in the figure is an ideal op-amp, and R1= 20 kΩ, R2 = 60 kΩ, L1=10 mH.  b) State the Barkhausen criterion for sustained oscillation.c) Explain briefly how the phase shift requirement for sustained oscillation ismet in the circuit of Figure 3.d) The feedback ratio and oscillation frequency of Figure 3 are givenrespectively by, B = -L2/L1 and w0 = 1 / sqrt(L1 +L2)C Determine the values of C and L2 in order for the circuit to oscillate at a frequency of 200 Hz.

a) Two feedback configurations are shown in Figures Q1.a(i) and Q1.a(ii). Derive the closed-loop gain Af in each case. V₁. V₁. A1 B1 Figure Q1.a(i) A₁ B₁ Figure Q1.a(ii) A₂ A₂ B₂ ܘܢ -V

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