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What is cross over distortion?

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What is cross over distortion?

(a) Effect occurred during switching of transistor after every half cycle

(b) Distortion occurred due to resistors

(c) Distortion occurred due to Capacitors

(d) Distortion occurred due to Inductors

I had been asked this question by my school principal while I was bunking the class.

I want to ask this question from Class B Amplifiers in chapter Power Amplifiers of Electronic Devices & Circuits

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The correct choice is (a) Effect occurred during switching of transistor after every half cycle

To explain I would say: Transistor takes 0.7V to turn on when during the end of half cycles, the input gets below 0.7V and it is not possible to reproduce these signals. This is called as Cross over distortion.

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