Transistor Feedback Circuits Unit 2 – Series Feedback
The output current (IRCL) flows through the emitter feedback resistor (RE).
IRCL through RE develops a feedback voltage (Vf).
Vf opposes the input voltage (Va).
The feedback ratio (β ) is the fractional part of the output voltage that is fed back to the input.
To understand the feedback ratio (β) in a common emitter amplifier such as this one, consider
the output taken across the emitter resistor (RE).
Since all of the output voltage (Vo) is fed back to the input (Vf = Vo), the feedback ratio (β)
would be 1.