set19new - R F /R in order for | V o /V o | = 1 6 at f = f...

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ECE3050 Assignment 19 1. The circuit shows a Wein bridge oscillator. If R 1 = R 2 , C 1 =0 . 1 µ F , C 2 =0 . 22 µ F ,and R 4 =10k , specify R 1 , R 2 ,and R 3 for the circuit to have stable oscillations at f = 1000 Hz . Answers: R 1 = R 2 = 1073 and R 3 = 6875 . 2. The f gure shows a phase-shift oscillator with the feedback loop broken. By writing node equations, it can be shown that the loop-gain transfer function is given by V 0 o V o = R F R ( RCs ) 3 ( RCs ) 3 +6( RCs ) 2 +5( RCs )+1 (a) To solve for the frequency of oscillation, what do you set V 0 o /V o equal to? Answer: 1 6 0 . (b) Use the transfer function to solve for the frequency of oscillation. Answer: f 0 = 1 / ¡ 2 π 6 RC ¢ . (c) Use the transfer function to solve for value of
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Unformatted text preview: R F /R in order for | V o /V o | = 1 6 at f = f . Answer: R F /R 1 = 29 . 3. The f gure shows a phase shift oscillator. If C = 0 . 1 F , specify R and R F for the circuit to have stable oscillations at f = 200 Hz . Answers: R = 3249 and R F = 94 . 21 k . 1 4. The loop-gain transfer function of a particular oscillator circuit is given by V o V o = K s ( s/ 100) 2 + 0 . 5 ( s/ 100) + 1 At what frequency does the circuit oscillate and what must be the value of K for stable oscillations? Answers: f = 15 . 9 Hz and K = 0 . 005 . 2...
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This note was uploaded on 05/25/2011 for the course ECE 3050 taught by Professor Hollis during the Summer '08 term at Georgia Institute of Technology.

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set19new - R F /R in order for | V o /V o | = 1 6 at f = f...

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