-
The high frequency response of an amplifier is given by
A = A0 
1 + j ω 
ω2
where A0 = 1000 and ω2 = 104. Negative feedback with β = 9/1000 is now given. The value of ω2 now is:
-
- 104
- 103
- 105
- none of these
Correct Option: C
From given high frequency response
| A = | ||||
| 1 + j | | ||
| ω2 | ||||
where, ω2 is the higher cut-off frequency.
and due to negative feedback ω2 increases, so the new,
ω2* = ω2 (1 + Aβ)
| = 104 | | 1 + 1000 × | | = 104. 10 = 105 | |
| 1000 |
Hence alternative (C) is the correct choice.
