Gain, Feedback and Amplifier

[padmow]

Hi,

I have this amplifier, a small signal transistor driving class AB
stage.

from the output of class AB stage, its connected back to base of the
small signal transistor .

how do I calculate gain of this amplifier.

best wishes
Padmow

 

[Andrew Holme]

padmow wrote:

Hi,

I have this amplifier, a small signal transistor driving class AB
stage.

from the output of class AB stage, its connected back to base of the
small signal transistor .

how do I calculate gain of this amplifier.

Gain (G) depends on the amount of negative feedback (B).

G ~ 1/B

 

[John Popelish]

padmow wrote:

Hi,

I have this amplifier, a small signal transistor driving class AB
stage.

from the output of class AB stage, its connected back to base of the
small signal transistor .

how do I calculate gain of this amplifier.

best wishes
Padmow

If the first base also has an input resistor, then the gain is

probably -(feedback resistance)/(input resistance), approximately.