# College Assignment question need help!

Discussion in 'Homework Help' started by unknown93, Feb 13, 2013.

1. ### unknown93 Thread Starter New Member

Feb 13, 2013
2
0
The question is

An amplifier has an open-loop gain off 99db's, if 10% of the output signal is fed-back into the input in antiphase with input signal, determine:

(A) From the first principles the transfer function for the amplifier and
(B) hence determine the closed-loop gain of the amplifier

thanks

2. ### MrChips Moderator

Oct 2, 2009
12,643
3,457
This is not a homework assignment service provider.

3. ### #12 Expert

Nov 30, 2010
16,704
7,354
We do have a Homework section. I'll ask to have this moved to the proper forum.

4. ### WBahn Moderator

Mar 31, 2012
18,088
4,917
What efforts have you made to solve the problem (never forget, it is YOUR problem)?

Once you show your efforts, we will have something to hook into and help you make progress.

5. ### unknown93 Thread Starter New Member

Feb 13, 2013
2
0
so some sort of formulae would help

thanks

6. ### MrChips Moderator

Oct 2, 2009
12,643
3,457
Geeze, you don't get it. There is no formula.
You have to work through the equations yourself.
We don't know. This is your problem. Show us what you think is the proper approach.
Start by drawing a diagram.

7. ### WBahn Moderator

Mar 31, 2012
18,088
4,917
Can you draw a circuit diagram that matches the description given?

What is the relationship between the input voltages to the amplifier and the output voltage?