. : , , . . (), . , , , , , .

, , , , . . . , . , .

. , . , , .

2.

() (). () , . , .

I0 ( ). I1 + I2 = I0 = const I0 U0.

, . . 1, 2 R1, R2. , . U . , .

U1 = U2 ( ). I0 (. . Ri = ), U . Ri , D I0, U = 0.

, (U1 U2 = U1), . . , :

U = U1 U2.

, .

U = U1 U2.

, .

, , , .

U = U1 = U2

D U = U1 U2 0.

. . . 68.

 

. 68.

:

.

, Ri. Ri .

.

UA (. 69). , . . , (15) 103 , (15) 105 . (R) .

U1 U2 = U 0, , . - (R) . . = SR. , j ( 0,026 ). S U < 2j , U > 4j , (.70).

I0 . , h21 ( ), , . +En 1, 2, . .

. 71.

.

U4 = U5 I1= I2.

(. 69).

I = I1 I2.

4 5, , , 1 2 , .

U1 = U2 = 0

D U 0. 1, 2 .

U . = U1 U2 .

, , , U ..

.

() .

, .

: . , 60- . ( ), , .

. . , , , . ( ) .

, :

, . . 72.

, 180 .

, , .

(). 103 107.

(U.). , , . U. , , , 0 . U. .

R. . R .

R. R .

U max. 15 .

... 60120 (...= 20 lg / c).

:

.

Vmax. /.

t. 0,1 0,9 .

Vmax, t , .

. 73. R1, R.

. 73.

, , . . . , I 0 U 0 U= U /.

. U + U,

.

.

U

U / R1 = (U U) R

,

.

Koc . >>Koc.

,

,

, .

(. 74), . , , , , .

. 75.

. 75.

, , U 0.

,

.

, . U 0,

.

.

R = R1, .

U = I1 (R1 // Roc) .

R =R1 // Roc (. 76).

. 76.

(. 77) .

. 77.

I 0 U 0

,

,

, , :

.

, ,

.

.

- () - ()

, . . , .

, , .

KU, RC-. .

- - :

,

.

R >>R,

.

. 78.

. 78.

 

. f, . 3 . f 10 ( ) (. . 20 ) . 20 / 6 / ( ).

- , 45 /, 0,1 f 10 f 5,7 . f , 45 . f 0 , 90 .

(. 79).

. 79.

. K1, K2, K3 f 1, f 2 , f 3.

( 80) 20 /, 90 .

. 80.

. . 80 45 f. .

-

. , , () R, R, , . , , . , .

, (. 81).

. 81. - , - -

, U = K0U. . 81,

,

b = R1 / (R1 + R) .

,

U/ U = K,

K = 0/ (1 + b 0).

0 .

. 81, . 1/b , f, . f 180 . 180 ( ) f D j = 360 , Koc = 1/b > 1. , . . 81, Koc , , 1.

: , Koc = 1/b 20 /. , 90 ( ) f 2. f 2 45 . f .

. 40 /.

, , . . , 20 / f, (. 82). 90 , 90 .

RC .

. K>> 1, . . K = 1.

:

, /.

- . , , . . , , , .

, .

U = U sin 2p ft dU/dt = 2p f U cos 2p ft,

V = (dU/ft) max = 2p fU.

16 Dallas Semiconductor ( Maxim).


, , , , ? FAQ .




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