EE 330
Lecture 23
Area Comparison between MOS and Bipolar Circuits
Operating Point Characterization
Amplification with Transistor Circuits

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Bi-directional switching with the Triac
G
MT
p
p
n
n
n
MT
1
n
n
•
Has two cross-coupled SCRs !
•
Manufactured by diffusions
•
Single Gate Control
MT
1
MT
2
G
Review from Last Lecture

The Basic Triac Circuit
Assume ideal Triac
I
T
V
TR
I
G
=0
I
H
BGF
V
BGF
-V
AC
L
V
R
AC
V
AC
-V
AC
L
V
R
CC
T
L
TR
V
= I R
+V
Load Line:
The solution of these two equations is at the intersection of
the load line and the device characteristics
Analysis:
AC
T
L
TR
V
= I R
+V
,
FI
TR
GT1
I
= f
V
V
I
T
V
TR
I
G
=0
I
H
BGF
V
BGF
-V
AC
L
V
R
AC
V
AC
-V
AC
L
V
R
Two stable operating points for both positive and negative V
AC
V
AC
V
GT1
R
L
V
TR
I
T
Review from Last Lecture

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