Bipolar transistors

BIPOLAR TRANSISTORS

Rakhmatshoev Islombek
Assistant of the Department of Electrical Engineering, Electrical Mechanics and Electrical Technology.
Email: [e-mail]
Lecture-3
Fergana Polytechnic Institute

Lecture Overview

• What is a Transistor?
• History
• Types
• Characteristics
• Applications

The symbol shown represents a

• diode
• photodiode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• diode.
• photodiode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• transistor
• photodiode
• Zener diode
• Schottky diode.

Slide 23-
The symbol shown represents a

• transistor
• photodiode
• Zener diode
• Schottky diode.

Slide 23-
The symbol shown represents a

• diode.
• photodiode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• diode.
• photodiode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• diode.
• photodiode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• diode.
• photodiode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• Tunnel diode.
• Varactor diode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• Tunnel diode.
• Varactor diode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• Varactor diode
• photodiode
• Light emitting diode.
• Transistor.

Slide 23-
The symbol shown represents a

• Varactor diode
• photodiode
• Light emitting diode.
• Transistor.

Slide 23-

What is transistor?

• A transistor is a semiconductor device used to amplify or switch electrical signals and power.
• Transistors have many uses, including amplification, switching, voltage regulation, and the modulation of signals

A Brief History

• Guglielmo Marconi invents radio in 1895
• Problem: For long distance travel, signal must be amplified
• Lee De Forest improves on Fleming’s original vacuum tube to amplify signals
• Made use of third electrode
• Too bulky for most applications

Tranzistorning yaratilishi

• 1947 –yilda William Shockley, John Bardeen va Walter Brattain lar tomonidan birinchi bipolyar tranzistorlar yaratildi.
• 1956-yilda tranzistor effektini tadqiq qilgani uchun William Shockley, John Bardeen va Walter Brattain fizika boʻyicha Nobel mukofoti bilan taqdirlanishgan.

Bipolyar tranzistor (ВТ) deb o‘zaro ta’sirlashuvchi ikkita p-n o‘tishdan tashkil topgan va signallarni tok, kuchlanish yoki quwat bo‘yicha kuchaytiruvchi uch elektrodli yarimo‘tkazgich asbobga aytiladi. BTda tok hosil bo'lishida ikki xil (bipolyar) zaryad tashuvchilar —elektronlar va kovaklar ishtirok etadi. ВТ p— va n— o‘tkazuvchanlik turi takrorlanuvchi uchta (emitter, baza va kollektor) yarimo‘tkazgich sohaga ega.

BTlar chastota bo'yicha:

• BTlar chastota bo'yicha:
• past chastotali — 0,3 MGs gacha;
• o‘rta chastotali 0,3 - 30 MGs;
• yuqori chastotali 30 - 300 MGs;
• o‘ta yuqori chastotali — 300 MGs dan yuqori guruhlarga bo‘linadi.
• Quvvat bo'yicha:
• kam quwatli — 0,3 Vt gacha;
• o‘rta quwatli — 0,3 - 1,5 Vt;
• katta quwatli — 1,5 Vt dan yuqori guruhlarga ajratiladi
• Tuzilishi bo‘yicha:
• ko‘p emitterli (KET),
• Ko’p kollektorli (KKT)