171. In a PLL, to obtain lock, the signal frequency must:
(a) come within the lock range
(b) be less than the capture frequency
(c) come within the capture range
(d) be greater than the capture frequency
172. The Schmitt trigger is a two-state device that is used for:
(a) pulse shaping
(b) peak detection
(c) input noise rejection
(d) filtering
173. If the input to a comparator is a sine wave, the output is a:
(a) ramp voltage
(b) sine wave
(c) rectangular wave
(d) sawtooth wave
174. A noninverting closed-loop op-amp circuit generally has a gain factor:
(a) less than one
(b) greater than one
(c) of zero
(d) equal to one
175. An ideal amplifier should have:
(a) high input current
(b) zero offset
(c) high output impedance
(d) moderate gain
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Operational Amplifier Fundamentals » Exercise - 3 101. An operational amplifier has a ________ input impedance and a ________ output impedance. (a) high, low (b) high, high (c) low, low (d) low, high 102. What is the difference voltage if the inputs are an ideal opposite signal? (a) The differential gain times twice the input signal. (b) The differential gain times the input signal. (c) The common-mode gain times twice the input signal. (d) The common-mode gain times the input signal. 103. At what input voltage level does the output voltage level become numerically equal to the value of the common-mode gain of the amplifier? (a) Vi1 = –Vi2 = 0.25 V (b) Vi1 = –Vi2 = 0.50 V (c) Vi1 = –Vi2 = 0.75 V (d) Vi1 = –Vi2 = 1.00 V 104. What is the difference output voltage of any signals applied to the input terminals? (a) The differential gain times the difference input voltage. (b) The common-mode gain times the common input voltage. (c) The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage. (d) The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage. 105.…- 555555555580. Which of the following is (are) the result of gain reduction by a feedback? (a) The amplifier voltage gain is a more stable and precise value. (b) The input impedance of the circuit is increased over that of the op-amp alone. (c) The output impedance is reduced over that of the op-amp alone. (d) All of the above
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- 5555555555192. The voltage gain of the amplifier in the given circuit would increase if ______. (a) the feedback resistor was decreased in value (b) the input voltage was increased (c) the input resistor was increased in value (d) None of the above