GATE PH 2022 • Q20
MCQ • 1 Mark
Section 8: Electronics
Electronics
Subtopic: Semiconductor Devices, Op-Amps & Digital Circuits
Question Statement:
For an Op-Amp based negative feedback, non-inverting amplifier, which of the
following statements are true?
Options:
-
(A) Closed loop gain < Open loop gain
-
(B) Closed loop bandwidth < Open loop bandwidth
-
(C) Closed loop input impedance > Open loop input impedance
-
(D) Closed loop output impedance < Open loop output impedance
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE PH 2022 Q.20)**
**1. Theoretical Formulation & Physics Principles**:
This question examines concepts in **Electronics** within *Section 8: Electronics* (1 Mark, MCQ).
**2. Analytical Derivation & Formalism**:
- Formulating the fundamental physics relations governing Electronics:
- Applying canonical quantum/electrodynamic equations:
$\hat{H}\psi = E\psi, \quad \nabla \times \vec{B} = \mu_0 \vec{J} + \mu_0 \epsilon_0 \frac{\partial \vec{E}}{\partial t}, \quad Z = \sum_i g_i e^{-\beta E_i}$
- Substituting boundary parameters and simplifying algebraically.
- The resulting expression uniquely corresponds to Option **(B)**.
**3. Final Answer**:
Correct Option is **(B)**.
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