Write advantages and disadvantages of positive and negative feedback.
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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.

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