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440_hmk4

440_hmk4 - Each of the devices is biased to have r π =...

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ECE 440 – Electronics II Homework #4 1. The open-loop gain of the amplifier is A = 50, and the feedback factor is β = 0.5. a. Determine the closed loop gain, A f . b. If the open-loop gain, A, changes by +15%, what is the percentage change in the closed loop gain, A f ? c. If the feedback factor, β , changes by +15%, determine the percentage change in the closed loop gain, A f . 2. The open-loop gain of an amplifier is given as: A ( jf ) = 2 × 10 5 1 + jf 10 and the feedback factor, β = 0.05. Determine: a. The closed loop low frequency gain, A of . b. The closed loop bandwidth c. The gain-bandwidth product 3. For the series-shunt feedback amplifier shown below, assume β = 50 for both devices. Find: a. A v b. Z i c. Z o A ! + V i V o -

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4. The series-shunt feedback amplifier shown below has DC biasing circuitry that is not shown.
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Unformatted text preview: Each of the devices is biased to have r π = 2.6K Ω and β = 100. Find: a. A v b. Z i c. Z o + v o-+ v i-25V 5K ! 47 K ! 150 K ! 10 K ! 4.7 K ! 100 ! 47 K ! 33 K ! 4.7 K ! 4.7 K ! 4.7 K ! 10 K ! Z i Z o Q1 Q2 V cc + v o-+ v i-9 K ! 600 ! 100 ! Z i Z o Q1 Q3 5 K ! Q2 100 ! 640 ! 5. For the circuit in problem 3, simulate the circuit using PSPICE. For the BJTs use parameters: IS = 1E-15, BF = 50. Apply a 0.01 volt peak 1KHz sine wave and plot the output voltage. Confirm that the device q points and the voltage gain of the circuit match your calculations. Turn in the schematic, the portion of the output file showing the q point, and a plot of the output. Use 1 µ F capacitors....
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