Common Emitter Configuration | lect.-03 | electronics

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Video highlights-
Common emitter Configuration
Circuit Diagram of Common emitter configuration
#Input characteristics & cut in voltage
#output characteristics (Active region , cut off region, saturation region)


This video from Virtue Physics Classes provides a detailed explanation of the Common Emitter Configuration of a transistor, including its circuit diagram and characteristics (0:04).

Here's a breakdown of the key topics covered:

• Common Emitter Configuration Definition: The emitter terminal is common to both the input and output (0:45).
• Circuit Diagram: The video illustrates the circuit diagram for both NPN (0:52) and PNP (2:31) transistors in a common emitter configuration.
• Input Section: The base-emitter (BE) junction is forward-biased, with input voltage VBE and input current IB (1:27).
• Output Section: The collector-emitter (CE) junction is reverse-biased, with output voltage VCE and output current IC (1:56).
• Characteristics Curves:
• Input Characteristics: This curve shows the relationship between input current (IB) and input voltage (VBE) at a constant output voltage (VCE) (4:07). The concept of cut-in voltage is introduced, which is the minimum input voltage at which the input current starts to increase significantly (5:19).
• Output Characteristics: This curve shows the relationship between output current (IC) and output voltage (VCE) at a constant input current (IB) (6:38).
• Regions of Operation: The output characteristics define three important regions (7:16):
• Active Region: Here, the collector-base (CB) junction is reverse-biased, and the emitter-base (EB) junction is forward-biased. This region is suitable for amplification (10:05).
• Cut-off Region: In this region, both junctions are reverse-biased, and the base current (IB) is zero. The transistor acts like an open switch (11:15).
• Saturated Region: Both junctions are forward-biased, and the transistor acts like a closed switch (11:47).
• Current Amplification Factor (Beta): The video defines beta (β) as the ratio of output current (IC) to input current (IB) at a constant VCE (13:03).
• Relation between Alpha (α) and Beta (β): The video derives the relationship between the current amplification factor in common base (alpha) and common emitter (beta) configurations (13:16). The key formulas derived are:
• α = β / (1 + β) (13:59)
• β = α / (1 - α) (14:36)

#electronic #bscphysics #basic engineering electronics #transistor

this stuff is helpful for -

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rajasthan university, mds ajmer , mgsu bikaner , mlsu udaipur, jnvu jodhpur, panjab university, Kota(open) university .

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#msc entrances, iit jam , gate , net jrf , tifr

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