Operational Amplifier Fundamentals » Exercise – 4
151. A PLL can be used as a(n) ___________.
(a) series voltage regulator
(b) frequency multiplier
(c) relaxation oscillator
(d) Schmitt trigger
152. A ______ is not a multivibrator.
(a) one-shot
(b) flip-flop
(c) VCO
(d) bistable
153. A circuit that has an output equal to the algebraic sum of the inputs is called a(n) ______ .
(a) integrator amplifier
(b) summing amplifier
(c) differential amplifier
(d) voltage multiplier
154. What starts a free-running multivibrator?
(a) a trigger
(b) an input signal
(c) an external circuit
(d) nothing
155. When a capacitor is used in place of a resistor in an op-amp network, its placement determines:
(a) open- or closed-loop gain
(b) integration or differentiation
(c) saturation or cutoff
(d) addition or subtraction
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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
- 5555555555143. With negative feedback, the returning signal (a) is proportional to the output current (b) is proportional to the differential voltage gain (c) opposes the input signal (d) aids the input signal
- 5555555555188. With negative feedback, the returning signal: (a) aids the input signal (b) is proportional to output current (c) opposes the input signal (d) is proportional to differential voltage gain
- 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