Question:
A differential amplifier has the following features
A differential amplifier has the following features
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Symmetrical differential pairs naturally cancel out common-mode noise and identical thermal drifts. This design provides high stability, insensitivity to temperature changes, and excellent application versatility.
Updated On: Jun 23, 2026
- Susceptibility to common-mode signals, sensitivity to temperature, versatility
- Immunity to common-mode signals, sensitivity to temperature, versatility
- Insensitivity to temperature, high stability, versatility
- Sensitivity to temperature, low stability, versatility
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The Correct Option is C
Solution and Explanation
Concept:
A differential amplifier amplifies the difference between two input voltages ($V_1 - V_2$) while rejecting signals that are common to both inputs. This performance is quantified by the Common-Mode Rejection Ratio (CMRR):
\[
\text{CMRR} = \left| \frac{A_d}{A_c} \right|
\]
Where $A_d$ is the differential gain and $A_c$ is the common-mode gain.
Step 1: Evaluating thermal stability features.
In a balanced transistor differential pair (such as the input stage of an operational amplifier), both transistors are fabricated close together on the same silicon die. If the operating temperature changes, the parameters of both transistors (such as base-emitter voltage $V_{be}$ and current gain $\beta$) drift by the exact same amount. Because the circuit amplifies only the difference between the two sides, these identical thermal drifts cancel each other out. This matching gives the differential amplifier excellent insensitivity to temperature changes and high DC operational stability.
Step 2: Evaluating operational versatility.
Differential amplifiers are highly versatile building blocks. They form the foundation of operational amplifiers, instrumentation amplifiers, and analog comparators, and they are widely used to reject environmental noise (such as 50/60 Hz power line hum) in biomedical signal acquisition systems. Therefore, the key combination of features includes insensitivity to temperature, high stability, and versatility, which matches Option (C).
Step 1: Evaluating thermal stability features.
In a balanced transistor differential pair (such as the input stage of an operational amplifier), both transistors are fabricated close together on the same silicon die. If the operating temperature changes, the parameters of both transistors (such as base-emitter voltage $V_{be}$ and current gain $\beta$) drift by the exact same amount. Because the circuit amplifies only the difference between the two sides, these identical thermal drifts cancel each other out. This matching gives the differential amplifier excellent insensitivity to temperature changes and high DC operational stability.
Step 2: Evaluating operational versatility.
Differential amplifiers are highly versatile building blocks. They form the foundation of operational amplifiers, instrumentation amplifiers, and analog comparators, and they are widely used to reject environmental noise (such as 50/60 Hz power line hum) in biomedical signal acquisition systems. Therefore, the key combination of features includes insensitivity to temperature, high stability, and versatility, which matches Option (C).
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