Discussion
Consider the following statements about an internally compensated operational amplifier.
1. Its dominant pole is placed at a few hertz
2. It is stable at any closed-loop gain down to unity
3. Its distortion correction is constant across the audio band
Which of the statements given above is or are correct?
Answer: C
The first two are correct and the third is not: the loop gain falls twenty decibels per decade above the dominant pole, so the correction at twenty kilohertz is some sixty times less than at twenty hertz. The first two statements are two views of the same design choice, and the third is the price it charges at the top of the band. A device stable everywhere is necessarily one whose loop gain has been given away at high frequency, and the distortion figure shows it.
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