Download Homework Ch 4 - ECM

Homework Ch 4
____
1. Input bias current of an op amp is the sum of the two input bias currents when the output is zero.
a. True
b. False
____
2. The closed loop gain of an inverting op amp is negative.
a. True
b. False
____
3. An op amp in the non-inverting configuration has its negative input terminal at virtual ground.
a. True
b. False
____
4. When a potentiometer is connected between the null inputs of an op amp, the input voltage can be partially
eliminated by adjusting the potentiometer.
a. True
b. False
____
5. When an op amp is used as a current-to-voltage converter, the load is connected in the feedback loop and the
input signal is connected to the inverting input.
a. True
b. False
____
6. Instrumentation amplifiers accurately output the difference between the inputs providing common-mode
rejection.
a. True
b. False
____
7. The gain of the non-inverting CDA and the inverting CDA is the same except for sign.
a. True
b. False
____
8. A second order low pass filter has a roll off of minus 40 db per decade.
a. True
b. False
____
9. A change is frequency from 100 radians per second (rps) to 1000 rps causes a minus 10 db change in gain.
a. True
b. False
____ 10. A notch filter is another term for a band-pass filter.
a. True
b. False
____ 11. When designing an inverting op amp circuit, the output offset phenomenon can be mitigated by
_____________.
a. reducing the closed loop gain of the circuit c. using low tolerance input and feedback
resistors
b. adding a resistor between the
non-inverting input and ground
d. replacing the input resistor with a
potentiometer
____ 12. The voltage fed back from an op amp output to its input is _____________________.
a. in phase with the input
b. small compared to the input
c. 90 degrees out of phase with the input
d. none of the above
____ 13. Which of the following op amp configurations has the highest input resistance?
a. differential amplifier
b. summing amplifier
c. inverting amplifier
d. non-inverting amplifier
____ 14. The voltage follower is not used as a _______________.
a. comparator
b. non-inverting amplifier
c. unit gain amplifier
d. isolation amplifier
____ 15. An op amp integrator is designed_____________.
a. with an op amp in the non-inverting
position
b. with a capacitor in the input circuit
c. for an output that is proportional to the
rate of change of the input
d. for detection of the transition of input
pulses.
e. all of the above
f. none of the above
____ 16.
Examine the above wave forms. The most accurate description the circuit that has the
would be a(n) ________________________ op amp.
a. differentiator
b. integrator
c. summing
d. comparator
____ 17. Filter design information that is typically not available on a bode plat is ___________.
for the
a. gain
b. half-power point
c. cut-off frequency
d. roll-off
____ 18. The best circuit choice for rejecting the common-mode DC component on which a signal is riding is a(n)
_______________.
a. instrumentation amplifier
b. differential amplifier
c. band elimination filter
d. band pass filter
e. Norton amplifier
____ 19. The coupling capacitor in CDA circuits is important because if its value is _____________.
a. too small the circuit gain will be decreased c. too small the circuit gain will be increased
b. too large the circuit gain will be decreased d. too large the circuit gain will be increased.
____ 20. The following circuit depicts a ______________.
a. a differentiator
b. a first order low pass filter
c. an integrator
d. a first order high pass filter
Homework Ch 4
Answer Section
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