Answered: LC-Tuned Circuits: Colpitts • This…

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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Answer the following Draw, Illustrate and label your schematic diagram before solving the problem.

3. ) A Colpitts Oscillator circuit having two (2) capacitors of 37 nF and 350 nF respectively are connected in parallel with an inductor of 30 mH. Determine the frequency of oscillations of the circuit, the feedback fraction and draw the circuit.

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LC-Tuned Circuits: Colpitts
• This
oscillator
Example: A Colpitts Oscillator circuit having two (2)
capacitors of 24 nF and 240 nF respectively are
connected in parallel with an inductor of 10 mH.
comes
Vcc
with a tank circuit in
which an inductor L is
connected in parallel to
Determine the frequency of oscillations of the
circuit, the feedback fraction, and draw the circuit.
R1
Re
the serial combination of
capacitors C1 and C2.
C,C2
C, + C2
Co
CC2
24 nF x 240 nF
Ceff
Ceff
= 21.82 nF
C;
C1 + C2
24 nF + 240 nF
1
RE
Co
f =
2n x LCeff
1
1
f =
2n LCeff 2n
f = 10.77 kHz
C2
(10 mH)(21.82 nF)
Tank Circuit

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