AExE01 · Chapter 1Basic Electrical & Electronics🏛️ Past Licensure QuestionID: c9564d12
In a standard RC phase shift oscillator, we use ________ cascaded RC sections.
In a standard RC phase shift oscillator, we use ________ cascaded RC sections.
Multiple Choice Options
- A
Two
- B✓ Correct Option
Three
- C
Four
- D
One
Detailed Technical Solution & Explanation
An inverting amplifier produces 180° phase inversion. To achieve the 360° total loop phase shift required by Barkhausen's criterion, the passive RC feedback network must provide an additional 180° phase shift. Since a single RC stage provides at most , a minimum of three cascaded RC sections (each contributing 60°) are required.
Option Analysis:
•
Option A (Two): Incorrect. Two sections can never reach 180°.
•
Option B (Three): Correct. Minimum three sections are needed ().
•
Option C (Four): Incorrect.
•
Option D (One): Incorrect.
Reference: Mock Test 04NEC Licensure Syllabus