Discussion
Consider the following statements about the emitter follower.
1. Its voltage gain is slightly less than unity
2. Its input impedance is beta times its emitter load
3. Its output impedance is the source impedance divided by beta
Which of the statements given above is or are correct?
Answer: B
All three are correct, and together they describe the follower completely: no voltage gain, impedance multiplied looking in, impedance divided looking out. The last two are the same reflection rule applied in opposite directions, which is why the device transforms impedance in the way a transformer does but without any winding. A stage worth using despite having no gain is one whose value lies entirely in those two impedances. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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