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posted by  Johon1973 on 11/1/2009 9:59:13 PM  |  status: Closed  |  Earned Karma: 50

electronic communication system

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N/A N/A N/A N/A 11/2/2009 at 2:00:00 PM
Question Details:
An RC phase-shift oscillator is to operate at 2.5 MHz. The only resistors available are 10 kΩ.
What value of capacitors are needed to accomplish this design?
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Oracle
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posted by Shree_vani(MNK) on 11/1/2009 10:47:34 PM  |  status: Live
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Response Details:
Data given
R = 10kΩ
f = 2.5MHz
To find
C = ?
Solution
RC phase shift oscillator has three RC stages. With R1 = R2 = R3 = R and C1=C2=C3=C,
The frequency of the output of a RC phase shift oscillator is given by
f = 1 / 2π√6 RC
Then, C can be calculated as
C = 1 / 2π√6 Rf
C = 1 / (2)(3.14)(2.45)(10000)
C = 6.5 * 10-6
C = 6.5μF
Thus u can choose C1=C2=C3=6.5μf
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