Write advantages and disadvantages of positive and negative feedback.
Advantages of Positive Feedback: i) Voltage gain increases. ii) No phase shift is provided. iii) Feedback signal and input signal are in phase. iv) Input and Output voltage increases.
Disadvantages of Positive Feedback: i) Stability becomes poor as feedback increases. ii) Noise increases with feedback. iii) Bandwidth decreases. iv) Input impedance decreases.
Advantages of Negative Feedback: i) Stability becomes better as feedback increases. ii) Noise decreases with feedback. iii) Bandwidth increases. iv) Input impedance increases.
Disadvantages of Negative Feedback: i) Voltage gain decreases. Phase shift of 180 is provided. ii) Feedback signal and input signal are out of phase. iii) Input and Output voltage decreases.