Oscillator Circuits

Feb 3rd, 2012
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Q1) List the general requirements for oscillation? Q2) How does an RC combination affect the phase plot of an oscillator? Q3) For a Wien-bridge oscillator a. Given R = 20Kohm and C = 10nF what is the frequency of oscillation? b. Given a required frequency of oscillation of f = 3 kHz and R = 5kohm, what should the value of C be?

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Oscillator CircuitsQ1) List the general requirements for oscillation?Ans i. For any feedback circuit the transfer function is Vout/Vin =A/1+AFor oscillations, system should be unstable so, A= -1 (Barkhausen Criterion)ii. All the oscillator circuits are composed of TLV247X OP-AMP, 5% resistors and 20% capacitors.Q2) How does an RC combination affect the phase plot of an oscillator?Ans The phase shift determines the oscillating frequency and the oscillator oscillates only on that frequency w

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