Discussion
The same amplifier's \( 100 \ \Omega \) open-loop output impedance, with voltage sampling, becomes
Answer: A
Voltage sampling divides by the same factor:
\[ Z_{of} = \frac{100}{25} = 4 \ \Omega \]
giving 4 ohms, which is why a feedback power amplifier can present a fraction of an ohm to a loudspeaker despite output devices that are far from ideal. Multiplying instead gives 2500 ohms, the current-sampling result. One factor applied as a multiplication at one port and a division at the other covers the whole impedance behaviour.
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