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

Feedback Amplifiers, Oscillators & 555 Timers question bank (Electronic Devices & Analog Circuits)

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Q1.

[Feedback Amplifiers, Oscillators & 555 Timers Concept 5] 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.

[Feedback Amplifiers, Oscillators & 555 Timers Concept 10] 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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