Answered: R₁ L₂ R₂ + с 100- Figure 3 L₁ Vo

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

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 is
met in the circuit of Figure 3.

d) The feedback ratio and oscillation frequency of Figure 3 are given
respectively 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.

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