Discussion
An amplifier has open-loop gain \( 200 \) and feedback fraction \( 0.05 \). Its closed-loop gain is
Answer: A
Applying the feedback equation:
\[ A_{f} = \frac{200}{1 + 10} \approx 18.2 \]
giving 18.2, some nine per cent below the ideal twenty. A loop gain of only ten leaves a noticeable dependence on the open-loop gain, which is why a loop gain of a hundred or more is preferred where accuracy matters. The size of the departure from the ideal is itself a measure of how much feedback is present.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development