10 Questions
In which BJT configuration is the base the common point, the emitter is negative, and the collector is positive?
Common-Base (CB)
What are the input parameters for the Common-Base (CB) BJT configuration?
VBE and IE
What happens to the minority carriers when VCB is increased in the Common-Base (CB) BJT configuration?
Minority carriers are swept from base to collector
Which BJT configuration has the common point used to give a single reference to the input and output voltage of the transistor?
Common-Base (CB)
What are the output parameters for the Common-Base (CB) BJT configuration?
VCB and IC
What is the purpose of disabling the emitter resistance in the amplifier circuit?
To increase the output voltage
What effect does partially disabling the emitter resistance have on the amplifier circuit?
Reduces the voltage gain
What is the role of the capacitor CE=47μF in the amplifier circuit?
To block DC signals from reaching the output
What is the significance of finding IB current for Vin=40mV without breaking the circuit?
To ensure proper biasing of the transistor
How does increasing VCB in the Common-Base (CB) BJT configuration affect the minority carriers?
Decreases their concentration
Study Notes
- Introductory Electronics (MBS108) Lecture 9 topic: Semiconductors & Diodes, focusing on BJT in normal operation
- BJT: Bipolar Junction Transistor, used with two types of carriers: electrons and holes
- Two DC sources connected: BJT in normal operation
- Base is common point, emitter is negative, collector is positive
- Reverse current flows through the junction due to minority carriers
- Three BJT configurations: Common-Base (CB), Common-Emitter (CE), and Common-Collector (CC)
- Common-Base (CB) configuration:
- E-B junction is forward biased, C-B is reverse biased
- Common point is used as a reference for input and output voltage
- Common-Base (CB) characteristics:
- Input parameters: VBE (Base-Emitter voltage) and IE (Emitter current)
- Output parameters: VCB (Collector-Base voltage) and IC (Collector current)
- Input characteristics:
- IE depends on VBE for different VCB
- IE and VBE behave like a forward-biased diode
- Increasing VCB increases the number of minority carriers, increasing IE
- VCB's effect on input can be negligible.
Test your knowledge on the basics of semiconductors and diodes including BJT in normal operation, current direction, and DC sources.
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