Calculate the frequency of oscillation for each circuit in Figure 16–60 and identify the type of oscillator. Assume Q > 10 in each case.

Question

Calculate the frequency of oscillation for each circuit in Figure 16–60 and identify the type of oscillator. Assume Q > 10  in each case.

Robert · Accepted Answer

Solution:-
Consider the following circuit Diagram :-
Colpitts oscillator users an Lc circuit in the feedback loop to provide the phase shift and it acts as a 
resonant filter which is used to pass only the desired frequency of oscillation. 
Calculate the value of total capacitance is as follows,
Calculate the frequency of oscillation by using following formula. 
15
1 1
2 2 (5 )(90.9 )
1
2 454.5 10
236
r
r
f
Lc mH pF
kHz
 
 
 


   
Therefore ,

Calculate the frequency of oscillation for each circuit in Figure 16–60 and identify the type of oscillator. Assume Q > 10 in each case.

Solution

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