Discussion
Which stage in a superhet determines the noise figure most strongly?
Answer: A
The first amplifier dominates, because the Friis cascade divides every later stage's contribution by the gain accumulated ahead of it. The intermediate frequency amplifier matters more than one might expect when the mixer has loss, but it is still divided down. The detector and audio stages are effectively irrelevant. That weighting is why a low-noise front end is worth its cost and why any loss placed before it is so damaging.
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