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Which of the following is the equation for stray capacitance frequency?

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Which of the following is the equation for stray capacitance frequency?

(a) FH = 1/27R

(b) FH = 1/R

(c) FH = 54/27R

(d) FH = 11/27R

I had been asked this question by my college professor while I was bunking the class.

The doubt is from The Junction Field-Effect Transistor topic in portion Field-Effect Transistors of Electronic Devices & Circuits

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Correct choice is (a) FH = 1/27R

Explanation: During high frequency the capacitance is due to combination of transmission capacitance and junction capacitance. The equation is given by FH = 1/27R.

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