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Which of the following helps in reducing the switching time of a transistor?

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Which of the following helps in reducing the switching time of a transistor?

(a) a resistor connected from base to ground

(b) a resistor connected from emitter to ground

(c) a capacitor connected from base to ground

(d) a capacitor connected from emitter to ground

The question was asked in an online interview.

My query is from Transistor Switching Times in division Transistor Characteristics of Electronic Devices & Circuits

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The correct answer is (a) a resistor connected from base to ground

To explain: Connecting a resistor connected from base of a transistor to ground/negative voltage helps in reducing the switching the switching time of the transistor. When transistor saturate, there is stored charge in the base that must be removed before it turns off.

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