32.SSD(EE-2080)L32_4april

32.SSD(EE-2080)L32_4april - Problem of Low Base‐doping:...

Info iconThis preview shows pages 1–20. Sign up to view the full content.

View Full Document Right Arrow Icon
SSD(EE-2080) Lecture 32 Dr. Shiv Govind Singh sgsingh@iith.ac.in Assistant Professor Electrical Engineering Semester 2, Y-2010/11
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Reference Text Book: 1. Physics of Semiconductor Devices, S. M. Sze , John Wiley & Sons (1981). 2. Solid State Electronics by Ben G. Streetman and Sanjay Banerjee , Prentice Hall International , Inc. 3. Semiconductor Physics and Devices, Donald A. Neamen, Tata Mcgraw-Hill Publishing company Limited. Reference Book: Semiconductor Device Fundamental R. Pirret
Background image of page 2
How to make Good BJT For a given Emitter length Short Base Low Base Doping than Emitter Material
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Doping for Gain
Background image of page 4
Problem of Low Base Doping: Current Crowding Punch‐through Base Width Modulation Early Voltage
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Problem of Low Base Doping: Punch‐through
Background image of page 6
Problem of low Base‐doping: Base Width Modulation
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 14
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 16
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 18
Background image of page 19

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 20
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Problem of Low Base‐doping: Early Voltage V a Punch Through Early effect Collector Doping Kirk Effect ….. Perhaps High Doping in Emitter Tunneling cause loss of base control … Problems of classical transistor • Emitter doping: As high as possible without band gap narrowing • Base doping: As as possible without NE low possible, current crowding, Early effect • Collector Lower doping: than base doping without Kirk Effect • Base Width : As thin as possible without punch through How to make better Transistor Graded Base transport Polysilicon Emitter Heterojunction Bipolar Transistor Classical Shockley Transistor Poly‐silicon Emitter Poly‐silicon Emitter Gain in Poly‐silicon Transistor Short‐base Quasi‐ballistic Transistor Gain…...
View Full Document

Page1 / 20

32.SSD(EE-2080)L32_4april - Problem of Low Base‐doping:...

This preview shows document pages 1 - 20. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online