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Download ETEE3212 Spring 2007 Test
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ETEE3212 Spring 2007 Test #2 Name:________________________ Show all work. Clearly indicate final answer(s). CHEATSHEET MUST BE TURNED IN WITH TEST OR A ZERO WILL BE RECEIVED FOR ENTIRE TEST! 1. (40 points) For the Darlington compound differential amplifier shown to the right, design the amplifier for a maximum output voltage swing. Assume VT=26mV, all individual VBE=0.6V, VBE(Darlington)=1.2V, all individual β=200, β(Darlington)=20,000, VA=75V and IEE=1mA. Hint: Assume all iC=iE. Determine: a. R1 and RC b. Undistorted output voltage swing c. Ad, Ac and CMRR 2. (30 points) Design a single 741 op-amp that will generate vout = 4v1 – 5v2 – 6v3 + 3v4, when the equivalent resistance at the negative and positive terminals is Req=20kΩ. Determine each resistor value, input resistance at each of the amplifier inputs and the output resistance. Draw the schematic and show the resistor values. 3. (30 points) For the emitter-resistor amplifier to the right, calculate the lower corner 3dB frequency and sketch the Bode plot (magnitude only). Let RL=RC=1kΩ, CC=0.1µF, RE=100Ω, R1=1.5kΩ, R2=10kΩ, CB=0.01µF, RS=2kΩ, VCC=12V and β=150. Extra Credit (Maximum 25 points): Design an op-amp system to measure the output current of a power supply, as shown in the figure to the right. The voltage across a precision 1W resistor is used to measure the current out of the power supply. This output current varies from 75mA to 125mA. The digital voltmeter (DVM) input must be in the range of 0.75v to 1.25V.