Discussion
Why does feedback not reduce noise arriving at the amplifier's input?
Answer: D
Noise entering at the input is indistinguishable from signal, so the loop amplifies both and the ratio between them is unchanged. Bandwidth, location relative to the network and correlation are all beside the point. Feedback improves the signal-to-noise ratio only for noise generated inside the loop, such as a later stage's hum; the input stage's own noise is untouched, which is why low-noise design still begins with the first device. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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