§ 18-5 Combination of i-v characteristics
1,Series combination
2,Parallel combination
1D
2D
?
?
1?
?
?
2??
?
?
i 1D 2D
i
?
com pos ite
1? 2? )( 21 ?? ?
1D 2D
i
?
com pos ite
1i
2i
)( 21 ii ?
1D 2D
?
?
?
i
2i1i
i
?
?
?
?
?
D?
?
?
s?
D
s?
i
?
)(?fi ?
)(
)(
D
s
f
fi
?
??
?
??
i
?
)(?fi ?
sifi ?? )(?
si
3,Voltage bias(偏置 )
i
?
?
?
D
i
?
5,Inversion(倒置 )
i
?
?
?
D
Di
si
4,Current bias
Example 3,Diode logic gates(逻辑门 ).
sB?sA
?
s?
i
out ?
?
sB? sA?
s?
i
out ?
?
sB?sA
?
s?
i
out ?
?
s?out
?
sB?sA?
s?
i
out ?
?
,1” signifies that the voltage is less than vs.,0” signifies that the voltage is greater than or equal to
vs.
sA? sB? out?
0
0
00
0
111
11
11
??
???
?
s?
sA? sB?
i
R
?
?
out ?