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The PNP transistor shown in Fig has β = 50. Find the value of RC to obtain VC = +5V. What happens if transistor is replaced with another transistor having β = 100.

enter image description here

Mumbai University > Electronics and telecommunication engineering > Sem 3 > Analog electronics 1

Marks: 4M

Years: Dec 14

1 Answer
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Given:β1 = 50, β1 = 100, VC = 5V

Calculation with β1 = 50

Step1: Find IB and Ic

enter image description here

Apply KVL to the base loop to write

10 V = IEB + IBRB

IB = 10IEBRB = (100.7)(100X103)

IB = 93 μA

IC = β X IB = 50 X 93X 10(6) = 4.65 mA

Step2: Find RC

VC= 5V (Given)

But VC= IC X RC

5 = 4.65 X 10(3) X RC

RC = 1075.3 Ω

ii)Calculation with β_1 = 50

The value of IB remains unchanged

IB = 93 μA

New value of collector current is given by,

I_C= β X IB = 100 X 93X 10(6) = 9.3 mA

Find RC:

RC=VCIC=(5V)(9.3mA)= 537.6 Ω

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