{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

14 BJT Small Signal Analysis

# 14 BJT Small Signal Analysis - npn pnp Transistor Basic...

This preview shows pages 1–9. Sign up to view the full content.

1 npn / pnp Transistor Basic Principle DC Biasing Circuits ac Signal Circuits ac Equivalent Transistor Model ac Small-Signal Analysis

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

View Full Document
2 S uperposition What next ?? Thevenin’s /Kirchhoff’s Theorem ac Equivalent Transistor Model Hybrid Equivalent Model r e Equivalent Model Small-signal Analysis Z i , Z o , A i , A v
3

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

View Full Document
4
5 (3) Voltage Gain ( A v = v o / v i ) :- C ie fe ie b C b fe i o v R h h h i R i h v v A - = × × - = = - ve π phase shift between v i and v o (4) Current Gain ( A i = i o / i i ):- b fe c o i h i i = = ( ) ( ) ie i b h R R R R i i + = 2 1 2 1 // // ( ) ( ) ie fe i o i h R R R R h i i A + = = 2 1 2 1 // // Phase Shift ?? R 1 // R 2 + - + - v i R C b e c i b i c v out i i h fe i b h ie R 1 // R 2 + - + - v i R C b e c i b i c v out i i h fe i b h ie i o I

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

View Full Document
6 or (4) Current Gain A i :- = + = + = + = ie i ie i ie i i b i h R R v h R R v h v R R v i I i // // 1 1 // 1 // 2 1 2 1 2 1 + = + = + = ie fe o ie ie b ie ie i i h R R h i h h R R i h h R R v i 1 // 1 1 // 1 1 // 1 2 1 2 1 2 1 ( ) ( ) 2 1 2 1 1 2 1 // // 1 // 1 R R h R R h h R R h h i i A ie fe ie ie fe i o i + = + = = - R 1 // R 2 + - + - v i R C b e c i b i c v out i i h fe i b h ie i o I
7

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

View Full Document
8 Example - Common-Emitter (Fixed-Bias) Configuration : Same as before!! B e B ie i i i R r R h i v Z // // β = = = C x o o R i v Z = = C e C ie fe i o v R r R h h v v A - = - = = β β B e B B ie B fe i o i R r R R h R h i i A + = + = = β β Z i ~ 1k Ω Z o ~ 3k Ω A v ~ - 300 A i ~ 100 R C R B +V CC E C B i o Z o i i Z i C 2 C 1 v i v o (R 1 // )R 2 + - + - v i R C b e c i b i c v out i i h fe i b h ie i o Z o Z i R
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 33

14 BJT Small Signal Analysis - npn pnp Transistor Basic...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online