A device which increases the amplitude of the input signal is called amplifier.
NPN transistor as CE amplifier
- ie =ib +ic; ib= 5% of ie and ic= 95% of ie
- Vcc > VBB
- Net collector voltage VCE =vcc-icRL
- Input and output signals are 180° out of phase.
Transistor as CB amplifier
Transistor as CE amplifier
Relation between α and ß