#### brahma

##### Advanced Member level 4

**feedback...**

i started studying negative feedback in opamp, there it is given negative feedback increases stability of the amplifier and also given

**β*a > 1**, where a is the openloop gain, then in positive feedback by nyquist criteria β*a <=1, if this condition is not statisfied then the system is unstable. i dont understand this, anybody could make me clear...