PHYSICS

1. Source
Drain
Gate
Dam
Valve
ArteryVein
Heart

2. Gain medium
Incoherent
Light
Coherent
Light
ECE 663
Source
Drain
Gate
Valve
ArteryVein
Emitter Collector
Base
Ion Channel
Dam Laser Heart
Axonal conductionMOSFETBJT

3. •
(; 0 1 )
• '' (3 )
1 2
(Amplification  Analog applications; Turn 0.5  50)

4. Gain = 300

5. http://www.computerhistory.org/semiconductor/timeline.html#1940s

6. P N
W
Vappl > 0
-+
N P
W
Vappl < 0
-+
Forward bias, + on P, - on N
(Shrink W, Vbi)
Reverse bias, + on N, - on P
(Expand W, Vbi)
I
V
I
V

7. +
- +
-
IE
IB
IC
IE = IB + IC ………(KCL)
VEC = VEB + VBC ……… (KVL)

8. ECE 663
GAIN
CONFIG

9. +
- +
-
IE
IB
IC
ECE 663
VEB, VBC > 0  VEC >> 0
IE, IC > 0  IB > 0
VEB >-VBC > 0  VEC > 0 but small
IE > -IC > 0  IB > 0
VEB < 0, VBC > 0  VEC > 0
IE < 0, IC > 0  IB > 0 but small

10. ECE 663
Bias Mode E-B Junction C-B Junction
Saturation Forward Forward
Active Forward Reverse
Inverted Reverse Forward
Cutoff Reverse Reverse

11. ECE 663

12. ECE 663
PNP BJT Electrostatics

13. ECE 663
PNP BJT Electrostatics

14. ECE 663

15. ECE 663
,
thermionically
recombine
VEB > 0
VCB > 0

16. ECE 663
P+ N P
nE(x’)
nE0
pB0
pB(x)
nC0
nC(x’’)

17. ECE 663

18. ECE 663

19. ECE 663