engineering

1. Title : Bipolar Junction Transistor
(BJT)

2. Content
 Definition
 BJT type and operation
 BJT symbol and Terminal configuration
 Transistor connection
 BJT Application

3. BJT operation
NPN BJT operation : A NPN bipolar junction transistor
(BJT) operates by controlling the flow of current between
two of its terminals, called the collector and emitter, using a
smaller current at the base terminal.
PNP BJT operation : In a PNP transistor, the base is
typically negatively biased with respect to the emitter,
causing a small current to flow out of the base terminal.
This small current controls a larger current flowing from the
emitter to the collector terminals

4. What is BJT?
A bipolar junction transistor is a three-terminal semiconductor
device. The three terminals of the BJT are the base, the
collector, and the emitter.

5. There are two types NPN and
PNP

6. BJT symbol and Terminal configuration
Emitter (E): The emitter is the terminal through which majority
charge carriers (electrons for NPN, holes for PNP) enter the
transistor.
Base (B): The base is the middle region of the transistor. It
controls the flow of charge carriers from the emitter to the
collector.
Collector (C): The collector is the terminal that collects majority
charge carriers emitted from the emitter.

7. Transistor connection
There are there connection way
 Common Base
 Common Emitter
 Common Collector

8. BJT application
• Audio Amplifiers
• Radio Frequency Amplifiers
• Signal Processing Circuits
• Digital Logic Circuits
• Power Control Circuits
• Motor Drivers
• Oscillator Circuits
• Clock Generation

9. Title: Field Effect Transistor(FET)
SUBMITTED BY-
MD. MOJAHID HOSSAIN – 12105038 (CSE)

10. Today Topic
FET Definition
Types of FET
Describe the work process
Characteristics and applications of FETs

11. What is FET?
A Field effect transistor(FET) is a three terminal semiconductor device. FET is a
voltage controller device. The three terminal device such as
 Gate
 Source
 Drain

12. How does a FET work?
Fate operates by the adjusting conductivity via gate voltage. Applied voltage forms depletion region
in following current by source to drain terminal for current pass.

13. Types Of Field Effect Transistors
Basic for n channel JFET Basic for n channel EMOSFET

14. Working Process Of JFET
JFET operates by controlling current following through a semiconductor channel. The gate voltage
modulates the width of a depletion region within the channel, regulating conductivity between source
and drain terminals."
N channel JFET

15. Working Of Process Of MOSFET
MOSFET operates by modulating current following between source and drain
terminals through a voltage applied to the gate. This voltage controls the conductivity
of a semiconductor channel, allowing precise regulation of current.

16. JFET Operating Characteristic

17. JFET Transfer Curve

18. Applications Of FETS
Amplification: FETs are commonly used in audio amplifiers, RF amplifiers, and
instrumentation amplifier due to their high input impedance and low. noise
characteristics.
Switching: FETs are utilized in digital logic circuits, power switching. applications,
and voltage regulators due to their fast switching speed and low power consumption.