充....2
.......3
ⅅ.....6
.......9
.....12
....15
..17
.....20
.....23
....24
1
. . , , . , , . .
: , . , . , , . a ( 39). ,
Umu . Umu ( 40). . ,
Umu
=Umu/? Um. (27) =ktg? (28) k
S(t), . u(t) : , . R1 C1 , u(t). C2 u(t).
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2
-
41. VD. , . 42.
S(t), . u(t) : , . R1 C1 , u(t). C2 u(t).
1/?01<< R1 << 1/?C1
1 R1 .
: . , ( 43). , .
. , . - , . , , . . . : R1 ; S
S(t), . u(t) : , . R1 C1 , u(t). C2 u(t).
3.
, . .
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S(t) u(t): S(t) = Um(1 + m u(t))cos (w0t +? 0);u(t) = Um cos (w0t +? 0). u1(t) u1(t) = S(t)? u(t)= Um (1+ m u(t)) cos (w0t + j0)??Um cos (w0t +?0) = 0,5 Um Um (1 + mu(t))??(1 + cos (2w0t + 2?0)) : u(t) = 0,5 Um Um m u(t ) (). . - . , , . . - .
. . , . ??? . 10 , .
, , . . - .
4