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Common emitter amplifier

A common emitter amplifier circuit, built using an n-p-n trans

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Medium

Solving time: 3 mins

A common emitter amplifier circuit, built using an $n - p - n$ transistor, is shown in the figure. Its DC current gain is $250, R_{C} = 1 k Ω$ and $V_{CC} = 10 V$ . What is the minimum base current for $V_{CE}$ to reach saturation?

40 μ A

10 μ A

100 μ A

7 μ A

Views: 5,217 students

Updated on: Jan 26, 2023

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

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Isabella Discussed

A common emitter amplifier circuit, built using an

n - p - n

transistor, is shown in the figure. Its DC current gain is

250, R_{C} = 1 k Ω

and

V_{CC} = 10 V

. What is the minimum base current for

V_{CE}

to reach saturation?

15 mins ago

Discuss this question LIVE

15 mins ago

Text solutionVerified

Exp. (a)
For a common emitter

n - p - n

transistor, DC current gain is

β_{DC} = \frac{I _{C}}{I _{B}}

At saturation state,

V_{CE}

becomes zero.

∴

V_{CC} - I_{C} R_{C} = 0

I_{C} \approx \frac{V _{CC}}{R _{C}}

= \frac{10}{1000} = 1 0^{- 2} A

Hence, saturation base current,

I_{B} = \frac{I _{C}}{β _{DC}} = \frac{1 0 ^{- 2}}{250} = 40 μ A

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Question Text	A common emitter amplifier circuit, built using an $n - p - n$ transistor, is shown in the figure. Its DC current gain is $250, R_{C} = 1 k Ω$ and $V_{CC} = 10 V$ . What is the minimum base current for $V_{CE}$ to reach saturation?
Updated On	Jan 26, 2023
Topic	Semiconductor Electronics: Materials, Devices and Simple Circuits
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 5
Upvotes	602
Avg. Video Duration	4 min

A common emitter amplifier circuit, built using an $n - p - n$ transistor, is shown in the figure. Its DC current gain is $250, R_{C} = 1 k Ω$ and $V_{CC} = 10 V$ . What is the minimum base current for $V_{CE}$ to reach saturation?

Text solutionVerified

Filo tutor solutions (5)

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A common emitter amplifier circuit, built using an $n - p - n$ transistor, is shown in the figure. Its DC current gain is $250, R_{C} = 1 k Ω$ and $V_{CC} = 10 V$ . What is the minimum base current for $V_{CE}$ to reach saturation?