bjt transistors and characteristics

BJT Transistors and Characteristics

ELEC 121

January 2004 ELEC 121 2

Introduction to BJT’s• Introduction to BJT’s• BJT Specification Sheets• BJT Characteristic Family of Curves• BJT Circuit Simulation – DC Bias• BJT Bias Circuits

– Fixed-Bias Circuit– Emitter-Stabilized Bias Circuit– Collector-Emitter Loop– Voltage Divider Bias Circuit– DC Bias with Voltage Feedback– Miscellaneous Bias Circuits

January 2004 ELEC 121 3

The NPN BJT

January 2004 ELEC 121 4

NPN Biasing

January 2004 ELEC 121 5

Example of Transistor Bias

January 2004 ELEC 121 6

Input Characteristics of a Common-Base Amp

January 2004 ELEC 121 7

Output Characteristics of a Common-Base Amp

January 2004 ELEC 121 8

Voltage Gain in a PNP Transistor

January 2004 ELEC 121 9

NPN CE Amplifier Characteristics

January 2004 ELEC 121 10

Transistor Specifications

January 2004 ELEC 121 11

Circuit to display Characteristic Curves

January 2004 ELEC 121 12

Collector Characteristic Curves

January 2004 ELEC 121 13

Common-emitter characteristics displaying exaggerated secondary effects

Characteristic Curves Secondary Effects

January 2004 ELEC 121 14

Maximum Power Curve for BJT

January 2004 ELEC 121 15

PNP Transistor

January 2004 ELEC 121 16

PNP Characteristics

January 2004 ELEC 121 17

PSpice Simulation for Family of Curves

January 2004 ELEC 121 18

DC Sweep Primary Sweep

January 2004 ELEC 121 19

DC Sweep Secondary Sweep

January 2004 ELEC 121 20

Probe Output for Family of Curves