Differentiate between positive and negative feedback.
PARAMETER
|
POSITIVE FEEDBACK
|
NEGATIVE FEEDBACK
|
Overall phase shift
|
0° or 360°
|
180°
|
Feedback and input signal
|
Are in phase
|
Are out of phase
|
Input signal
|
Increases due to feedback
|
Decreases due to feedback
|
Output signal
|
Increases due to feedback
|
Decreases due to feedback
|
Gain
|
Increases due to feedback
|
Decreases due to feedback
|
Stability
|
Becomes poor as feedback increases
|
Becomes better as feedback increases
|
Application
|
Oscillators, Schmitt trigger
|
Amplifier, regulated power supply, bootstrapping
|
Noise
|
Increases with feedback
|
Decreases with feedback
|
Bandwidth
|
Decreases
|
Increases
|
Input impedance
|
Decreases
|
Increases
|
Output impedance
|
Increases
|
Decreases
|