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The forward resistance for a PIN diode is given by ________

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The forward resistance for a PIN diode is given by ________

(a) RF = W/σP

(b) RF = W/σN

(c) RF = WσP

(d) RF = WσN

I had been asked this question in exam.

My doubt stems from p-i-n Diode and its Characteristics topic in portion Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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The correct option is (b) RF = W/σN

For explanation: Forward resistance for a PIN diode depends on the width, current density and positive carrier concentration of the diode. No diode is perfectly ideal. In practise, a diode offers a small resistance in forward bias which is called as forward resistance.

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