Transistors

1
Transistors

• 2008
• Analogue Electronics
• Bo Rohde Pedersen

2
The Current Amplifier
Typical, min, max ß
3
Voltage Amplifier

• Convert current amplification with resistor

4
Bias circuit
-Spread in ß -gt spread in current
5
Common Emitter (CE)
6
AC small signal diagram

• Transistor model
• DC capacitors
• Signal ground

7
Class Exercise

• Input Impedance
• Output Impedance
• Amplification (transfer function)

8
Output stage

• Class A
• Class B
• Class AB

9
Darlington
With positive input
With negative input
10
Current Mirror
11
Differential Amplifier
12
Preparation

• Read
• Page 443-449, 459, 467-470
• Look and Read
• http//www.zen22142.zen.co.uk/Design/config.htm
• http//www.zen22142.zen.co.uk/Design/bjtbias.htm