Midterm EET415

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Arizona State University *

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416

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Electrical Engineering

Date

Jan 9, 2024

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Problem1 : Calculate the output Voltage VOUT of the following circuit in terms of V1 and V2: (note that R3=R1=10K and R2=R4=100k) Problem2 : For the following circuit determine the value of RX if the desired output VOUT = 10 ( V 1 − V 2 ) (Note that R1,R2,R3,R4,R5,R6 AND R7 ARE ALL 10K OHMS)

Problem3 : A) Assume we have an ideal Opamp, Find The transfer function H ( s ) = VOUT VIN in terms of R1,C1,R2 and C2 for the following circuit : Let R1=100K, C1=100nf ,R2=2.7K and C2=2.7nf. B) Draw by hand the Bode Plot Make Comments about both the magnitude and phase functionality of this circuit. Problem4 : Using The Sallen Key Topology, design a Bandpass Active Filter with Unity Gain and a PassBand from 20Hertz to 20000 Hertz. a) Draw schematic (Show calculation of capacitor and resistor values) b) Compute the transfer function H ( s ) = VOUT VIN c) Draw the bode plot

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the 27 questions. 1) The potentiometer in an instrumentation amplifier is used to ________ . A) adjust the scale factor B) prevent clipping C) balance the circuit D) all of the above 2) A second order low - pass filter has a high - end roll - off of ________. A) 20 dB/octave B) 60 dB/octave C) 40 dB/decade D) 6 dB/decade 3) An active filter that provides a constant output for input signals from fol to foh is called an ideal ________. A) bandpass filter B) low - pass filter C) high - pass filter D) None of the above 4) This is a basic ________ circuit. A) differentiator B) subtractor C) integrator D) two - input multiplier 5) An active filter that provides a constant output for input signals above foh is called an ideal ________. A) bandpass filter B) low - pass filter C) high - pass filter D) None of the above 6) An active filter that provides a constant output from dc to fol, and then passes no signal above fol, is called an ideal ________. A) low - pass filter B) bandpass filter C) high - pass filter D) None of the above 7) The roll - off rate of a second order filter is ________. A) 60 dB/decade or 18 dB/octave B) 20 dB / decade or 6 dB/octave C) 40 dB/decade or 12 dB/octave D) 0 dB/decade or 0 dB/octave 8) For this cascade amplifier, the input voltage swing is 0.2 VPP. Calculate the peak - to - peak swing on the output voltage.

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A) 2.4 VPP B) 4.8 VPP C) 9.6 VPP D) 1.2 VPP 9) An op - amp low - pass active filter provides a constant output ________. A) from fol to foh B) from dc to fol C) from dc to infinite frequency D) for all frequencies higher than foh 10) When the input voltages to this circuit are Vi1 = 0.25 V and Vi2 = 0.5 V, the output is ________. A) - 3.0 V B) - 0.75 V C) 1.125 V D) - 4.5 V 11) If all resistances in this circuit are equal, the output is ________. A) V1 + V2 B) V1 × V2 C) V1 - V2 D) V2 - V1 12) The output of an op - amp voltage buffer is characterized by ________. A) Vo = Vi B) Vo = 1 C) Vo = ( 1 + Rf / R1)Vi D) Vo = -( Rf / R1)Vi where Rf = R1

13) How many feedback resistors are found in a 3 - input voltage summing circuit that is constructed around an op - amp? A) 0 B) 2 C) 1 D) 3 14) An inverting amplifier with + 11 V supply voltages normally has a sinusoidal output of 10 VPP. When checking the circuit with an oscilloscope, you find that the output is 0 V. Which of the following could account for this problem? A) V1 = 0 B) RF is shorted by a solder bridge. C) R1 is open. D) All of the above 15) The op - amp circuit that adds each input and multiplies the sum by a fixed amount is called A) differentiator B) summing amplifier C) unity follower D) integrator 16) An op - amp integrator circuit has a 2 M egaohm input resistor and a 5 μF feedback loop capacitor. If the inverting input voltage is 2 VDC, the final value of the output voltage is ________. A) 0.02 V B) - 0.2 V C) - 20 V D) - 2 V 17) Op - amp differentiator circuits differ from the integrators in that the differentiators ________. A) have a resistor in the feedback loop B) are not as useful C) have a scale factor of – RC D) All of the above 18) A certain op - amp has a slew rate of 4 V/μsec. What is the maximum closed - loop voltage gain if the input voltage rises at a rate of 5 V/l00 μsec? A) 80 B) 20 C) 200 D) 40 19) The operational amplifier circuit shown here is a(n) ________. A) level comparator B) difference amplifier C) different iator D) integrator 20) The inverting and noninverting inputs to an op - amp are used to drive a(n) ________ amplifier. A) differential B) open - loop C) noninverting D) inverting 21) Slew rate is the ________. A) ratio of the change in time to the change in output voltage B) maximum rate at which the amplifier input voltage can change C) maximum rate at which the op - amp output voltage can change D) None of the above 22) The operational amplifier circuit shown here is a(n) ________.

A) difference amplifier B) integrator C) level comparator D) differentiator 23) The voltage follower typically has a voltage gain value of ________. A) 1 B) 1000 C) 10 D) 100 24) An op - amp circuit has ±15 V supply voltages and a voltage gain of 20. The noninverting voltage (v + ) is 0.3 V and the inverting voltage (v - ) is 0.35 V. What is the output voltage from the device? A) - 1 V B) - 7 V C) + 1 V D) + 6 V 25) The operational amplifier will only slightly amplify signals ________. A) that are common on both the inputs B) that are different on both the inputs C) when the supply voltages are less then ±5 V D) when the supply voltages are more then ±25 V 26) For this AC equivalent circuit of an op - amp, the input signal is applied between the input terminals and sees an input impedance Ri. This impedance ________. A) is a few kilo - ohms B) depends on the op - amp used. It could be a few hundred ohms to a few hundred kilo - ohms C) is a few hundred ohms D) is a few hundred kilo - ohms 27) What is the design value for Rf?

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