# Operational Amplifier Fundamentals – Exercise – 3

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

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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.

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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

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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.

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105. At what input voltage level does the output voltage level become numerically equal to the value of the differential gain of the amplifier? (a) Vi1 = –Vi2 = 0.25 V (b) V i1 = –V i2 = 0.50 V (c) V i1 = –V i2 = 0.75 V (d) V i1 = –Vi2 = 1.00 V