GATE & PSUs - Electrical & Electronics Engineering (EE & ECE)

Operational Amplifiers (Inverting, Non-Inverting, Integrator, Active Filters) question bank (Electronic Devices & Analog Circuits)

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Q1.
[Operational Amplifiers (Inverting, Non-Inverting, Integrator, Active Filters) Concept 4] An ideal op-amp inverting amplifier has input resistance $R_1 = 10\,\text{k}\Omega$ and feedback resistance $R_f = 100\,\text{k}\Omega$. What is the closed-loop voltage gain $A_v$ and input impedance seen by the source?

(A)
$A_v = -10, \quad Z_{\text{in}} = 10\,\text{k}\Omega$
(B)
$A_v = +11, \quad Z_{\text{in}} = \infty$
(C)
$A_v = -10, \quad Z_{\text{in}} = 100\,\text{k}\Omega$
(D)
$A_v = -100, \quad Z_{\text{in}} = 10\,\text{k}\Omega$
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Q2.
[Operational Amplifiers (Inverting, Non-Inverting, Integrator, Active Filters) Concept 9] An ideal op-amp inverting amplifier has input resistance $R_1 = 10\,\text{k}\Omega$ and feedback resistance $R_f = 100\,\text{k}\Omega$. What is the closed-loop voltage gain $A_v$ and input impedance seen by the source?

(A)
$A_v = -10, \quad Z_{\text{in}} = 10\,\text{k}\Omega$
(B)
$A_v = +11, \quad Z_{\text{in}} = \infty$
(C)
$A_v = -10, \quad Z_{\text{in}} = 100\,\text{k}\Omega$
(D)
$A_v = -100, \quad Z_{\text{in}} = 10\,\text{k}\Omega$
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