3.1
, :
;
;
.
(. 1). , .
(. 1), U U . , , , 
.
U
, U .
3.2
- K U.
- U , , .
- U ,.
- I , .
- K . . .
3.3
. .
3.3.1 2 ( ).
U I 1 = U / R 1, U I 2 = U / R 2. , R → ∞,
= U / U = R 2/ R 1. (1)
,
180 . , R 2 = R 1 = 1. .
U = · U , .. , . > 1 , < 1 .
3.3.2 3.
I 1· R 1 = U , I 2· R 2 = U U . = 1 + (R 2/ R 1). (2)
, R 2 = 0 = 1.
3.3.3 4.
D I 1 I 2,
I 1 = U1/ R 2, I 2 = U 2/2 R 2, I 3 = U/ R 2. , = -1.
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|
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U = -1(U 1 + U 2). (3)
.
3.3.4 5.
U U . .
U = U (R 2/ R 1). U = U [ R 4/(R 4 + R 3)][1 + (R 2/ R 1)].
U = U U = [ R 4/(R 4 + R 3)][1 + (R 2/ R 1)] (R 2/ R 1).
R 3 = R 1, R 4 = R 2,
U = (R 2/ R 1)(U U ),
.. .
= U /(U U ) = (R 2/ R 1) (4)
4.1
2.
Analog Is. , (. 2). , , (, lm1xx), . , . Edit . Edit, Display, Use Schematic, .
3 .
V 3 V 4 12 .
. .
4.2
4.2.1
U = V 2 = + 0.2 .
. , .
, 2.
- ()
U = ƒ(V 2).
V 2 1.2 0.2 U .
U "", .. . .
1.
.
, 5 .
I 1 (1) R = U / I .
|
.2.
- R 2 = R 1. K = U / U (= M2/V2).
R 2.
4.2.2
3.
- .
U - 1 + 1 ,
(2). 1 3.
- 0,6 .
- R 1 (R 1 → ∞), .
 |
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. 3.
. 1. .
| V 1,2 [B] | -0,2 | +0,2 | ||||||||||
| . | U [B] | +12 | -12 | |||||||||
| . | U [B] |
4.2.3
( ).
. 4. 2∙ R 2 , R 2.
8∙ R 2 ( ) V 1. V 1 ,
0,5 . 2 1.
 |
. 4.
, 2 2.
. 2. .
V 1 , 3 (2). . 1 V 1, 0 . .
1 .
0,5 .
| U | |||||
| 4 (D) | 3 () | 2 () | 1 () | ||
| 0,5 | |||||
8 D.
4.2.4
5.
R 3 = R 1, R 4 = R 2.
V 1 V 2 1000 .
1 ().
 |
. 5.
V 2 , V 1~ U = 500 .
K U U ( 1). K U = U / U . .
KU. , V 2~ U . = 500 ( V 2) ( V 1 = 0). U ( 1).
K U. = U / U ..
K . = 20 lg(K U / KU. ) [].
U = 500 ( V1), U. = 500 ( V2). .
:
1. ;
2. ( , R );
3. ;
4. ;
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5. . 2, 3 ;
6. - . ;
7. , .
1. .
2. .
3. .
4. . .
5. . .
6. .
7. .
8. .
9. , .
1.
. 3. .
| R 2 | ||||||||||||||
| R 1 |
R 3 = R 1// R 2 .
. 5 R 3 = R 1, R 4 = R 2.
.
Analysis Parameter Sweep. Component V ( ), Start value 12V Stop value + 12V, Output node . DC operating, Sweep type linear, Increment step size 1 V, point .
Simulate.
Analysis Graphs . , , 1.
7
