20190326191239hw_2_answers.docx - HW#2 MULTIPLE CHOICE 1...

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HW #2 MULTIPLE CHOICE 1. The current output (drain current, i D , from a field-effect transistor is controlled by two voltage differences: gate-source, V GS , and drain-source, V DS . Which of the following statements is TRUE ? a. The transconductance is the integral of i D over V DS . b. The transconductance is the partial derivative of i D with respect to V DS (drain-source voltage). c. The transconductance is the partial derivative of i D with respect to V GS (gate-source voltage). d. The transconductance is the partial derivative of i D with respect to the threshold voltage, V th . 2. Operational amplifiers amplify the voltage difference between two input terminals (inverting, -, and non-inverting, +). Which of the following statements is NOT an assumption about ideal behavior of op-amps? 3. Which of the following is FALSE about an inverting amplifier, with no feedback, powered by a voltage between +8 and -8 V, with open-loop gain of 5000, and with a corner frequency of 10 kHz? Assume non-ideal (real-world) behavior and a grounded non-inverting terminal. a. When the voltage input to the inverting (-) terminal is an alternating current with peak-to-peak amplitude of 4 mV and frequency of 1 Hz, the output voltage will be saturated. b. When the voltage input to the inverting (-) terminal is an alternating current with peak-to-peak amplitude of 1 mV and frequency of 1 Hz, the output voltage will 180 degrees phase-shifted from the input. c. When the voltage input to the inverting (-) terminal is an alternating current with peak-to-peak amplitude of 1 mV and frequency of 1 Hz, the output voltage peak-to- peak amplitude will be 5 V. d. When the voltage input to the inverting (-) terminal is an alternating current with peak-to-peak amplitude of 1 mV and frequency of 20 Hz, the output voltage will be saturated.
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Christopher Reinemann
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