Which mechanism causes decreased current gain in bipolar transistors at high frequencies?

A)Kirk effect base widening✓

B)Early effect channel modulation

C)Miller effect input capacitance

D)Zener effect avalance breakdown

💡 Explanation

The Kirk effect causes base widening because increasing collector current causes injected carriers to penetrate deeper into the base, thereby increasing effective base width causing decreased current gain at high frequencies. Therefore, base width modulation results and gain decreases, rather than breakdown or only capacitance effects.

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Which mechanism causes decreased current gain in bipolar transistors at high frequencies?

💡 Explanation

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