Common-Base Config: Alpha & IB Formula

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SUMMARY

The discussion focuses on calculating the base current (Ib) for a transistor using Kirchhoff's Current Law (KCL). The user specifies that the alpha (α) value should be between 0.9 and 1, with given emitter current (Ie) of 4 and collector current (Ic) of 3.992. The formula for base current (Ib) is derived from the relationship between these currents, confirming that Ib can be calculated as Ib = Ie - Ic. This establishes a clear method for determining base current in transistor circuits.

PREREQUISITES
  • Understanding of transistor operation and characteristics
  • Familiarity with Kirchhoff's Current Law (KCL)
  • Basic knowledge of electrical current relationships in circuits
  • Ability to interpret and manipulate formulas related to transistor parameters
NEXT STEPS
  • Study the derivation of the transistor current relationships, specifically focusing on the formulas for Ib, Ic, and Ie.
  • Learn about the implications of alpha (α) in transistor operation and how it affects circuit performance.
  • Explore practical applications of KCL in complex circuits involving multiple transistors.
  • Investigate simulation tools for analyzing transistor circuits, such as LTspice or Multisim.
USEFUL FOR

Electrical engineering students, circuit designers, and anyone involved in transistor circuit analysis and design.

Agent
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Hey, I'm currently stuck with this question. There are several parts to this question.

http://img373.imageshack.us/img373/8480/questionscj3.png

I know alpha should be around .9-1 but I don't think I know the formula for IB.
 
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Agent said:
Hey, I'm currently stuck with this question. There are several parts to this question.

http://img373.imageshack.us/img373/8480/questionscj3.png

I know alpha should be around .9-1 but I don't think I know the formula for IB.
In part A) Ie = 4 and and Ic = 3.992

What does Ib have to be?
 
Last edited by a moderator:
Use KCL for the transistor. What are the currents entering and leaving it.
 

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