3220 test #3

3220 test #3 - Name:_ EE 3220 SSN:_ Test # 3 Spring 2000 1....

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Name:_________________________________________ EE 3220 Test # 3 SSN:__________________________________________ Spring 2000 1. Use a nyquist plot to determine whether the following transfer function is stable. We have found the three poles of the transfer function. A(j ϖ ) ϖ 1 = 1000 -45 o A(j ϖ ) ϖ 2 = 8.6 -120 o A(j ϖ ) ϖ 3 = 0.99 -220 o 2. Find the oscillation frequency of this colpitts oscillator using a quartz crystal. L = 0.1 H C s = 0.3 pF C p = 200 pF Rs = 0 3. A transresistance amplifier has a gain of A r =1500, input impedance of 50 and output impedance if 85 . It is connected to a negative feedback circuit with β = .01. Find A fb , R in , R out , if r in- β = r out- β = 1M . Which type of feedback topologies are needed. Sketch the block diagram showing the forward and feedback connections (sampling and mixing types)
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4. An amplifier has a very large but unstable open loop gain. To fix this problem, we have added a feedback network that has
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This note was uploaded on 01/25/2012 for the course EE 3220 taught by Professor Audiffred during the Spring '06 term at LSU.

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3220 test #3 - Name:_ EE 3220 SSN:_ Test # 3 Spring 2000 1....

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