The Common Base Amplifier Part 1 [Transistor TS 7]
Published at : 23 Dec 2025
Transistor tutorial series episode 7. In this episode we introduce the common base bipolar junction transistor (BJT) amplifier circuit, and go over its small signal model. This video is part of a three-part miniseries on the common-base transistor circuit
Concepts discussed:
- common base transistor amplifier overview
- low frequency small signal voltage gain derivation
- low frequency small signal input impedance derivation
- low frequency small signal output impedance derivation
- discussion of results
- low frequency small signal current gain calculation
00:00 Intro
01:09 Common Base Overview
04:52 Voltage Gain Derivation
09:19 Common Voltage Gain Approximations
16:51 Input Impedance Derivation
18:38 Common Input Impedance Approximations
21:39 Output Impedance Derivation
28:45 Common Output Impedance Approximations
33:47 Discussion of Results
37:34 Current Gain Calculation
42:40 Outro
This video is part of the transistor tutorial series, a series that explores the fundamentals of transistors including BJT, MOSFETS, and JFETs