This equation looks very much like that for the voltage gain of negative voltage feedback amplifier.

**Current Gain with Negative Current Feedback**

Referring, we have,

I_{in} = I_{1} + I_{f}
= I_{1} + m_{i} I_{out}

But I_{out} = A_{i} I_{1},
where A_{i} is the current gain of the amplifier without feedback.

I_{in} = I_{1} + m_{i}
A_{i} I_{1} (ä I_{out} = A_{i} I_{1})

Current gain with negative current feedback is

This equation looks very much like that for the
voltage gain of negative voltage feedback amplifier. The only difference is
that we are dealing with current gain rather than the voltage gain.

The following points may be noted carefully :

**(i) **The current gain of the amplifier without
feedback is A_{i}. However, when negative current feedback is applied,
the current gain is reduced by a factor (1 + m_{i} A_{i}).

**(ii)
**The
feedback fraction (or current attenuation) m_{i} has a value between 0
and 1.

**(iii) **The negative current feedback does not affect
the voltage gain of the amplifier.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

**Related Topics **

Copyright © 2018-2021 BrainKart.com; All Rights Reserved. (BS) Developed by Therithal info, Chennai.