ACtE08 · Chapter 8Mock Test 06🏛️ Past Licensure QuestionID: 6773b047
In electronic amplifier design, what is meant by the stability of an amplified signal?
In electronic amplifier design, what is meant by the stability of an amplified signal?
Multiple Choice Options
- A✓ Correct Option
The amplified signal should not have self-oscillation
- B
The amplified signal must have a finite amplitude
- C
The input and output signals must be proportional
- D
The ratio of the input and output signals must be finite
Detailed Technical Solution & Explanation
In amplifier circuit design, stability refers to the amplifier's immunity to spontaneous internal feedback that leads to uncontrolled parasitic self-oscillations. An amplifier becomes unstable when internal or unintended external feedback satisfies the Barkhausen criterion ( with a phase shift of or ), causing it to act as an oscillator rather than a linear amplifier.
Option Analysis:
•
Option A (The amplified signal should not have self-oscillation): Correct; an amplifier is stable when its closed-loop poles remain strictly in the left-half s-plane and it is free from self-sustained oscillations.
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Option B (The amplified signal must have a finite amplitude): Incorrect; describes bounded-input bounded-output (BIBO) output amplitude, but stability specifically precludes sustained oscillation.
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Option C (The input and output signals must be proportional): Incorrect; describes amplifier linearity, not stability.
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Option D (The ratio of the input and output signals must be finite): Incorrect; describes finite voltage gain, not dynamic stability.
Reference: Mock Test 06NEC Licensure Syllabus