why oscillators should have postive feedback why not negative feedback?

even though negative feedback is more advantageous than postive.

Your Answer

In oscillators using positive feedback it is important that amplitude of the oscillator output remains stable. Therefore the closed loop gain must be 1 (unity). In other words, the gain within the loop (provided by the amplifier) should exactly match the losses (caused by the feedback circuit) within the loop.
 

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