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參數(shù)資料
| 型號： | AB-029 |
| 元件分類： | 差分放大器 |
| 英文描述： | AB-029 - INPUT FILTERING THE INA117 -200V DIFFERENCE AMPLIFIER |
| 中文描述： | 抗體- 029 -輸入過濾INA117 - 200伏差動放大器 |
| 文件頁數(shù)： | 3/42頁 |
| 文件大?。?/td> | 606K |
| 代理商： | AB-029 |
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3
Figure 1a. The circuit uses an op amp and four matched
resistors. If R
/R
= R
/R
, GAIN = R
/R
and CMR =
∞
. To
simulate DC CMR error, R
is set 0.01% low. CMR for a
four resistor difference amplifier is:
CMR = –20 LOG10 [(%/100) R
1
/(R
1
+ R
2
)]
Where:
% = % error in any resistor.
With a 0.01% resistor error, DC CMR for the INA105 unity
gain difference amplifier is 86dB, and DC CMR for the
INA106 gain-of-ten difference amplifier is 100.8dB.
To simulate AC CMR error, a small value capacitor, C
, is
placed in parallel with R
2
to roll-off of CMR with increasing
frequency.
FIGURE 1a. Difference Amp Macromodel and Node Assign-
ments.
FIVE-RESISTOR DIFFERENCE AMPLIFIER
The five-resistor difference amplifier macromodel used for
the INA117 is shown in Figure 4b. The advantage of the
five-resistor difference amplifier configuration is a boost in
input common-mode-voltage range for a given op amp
common-mode range. The circuit uses an op amp and five
matched resistors. If (R
|| R
)/R
= R
/R
, GAIN = R
/R
and
CMR =
∞
. To simulate DC CMR error, R
is set 0.005%
low. For errors in R
4
, the CMR for a five-resistor difference
amplifier is;
CMR = –20 LOG10 [(%/100) R
1
/(R
1
+ R
4
)]
Where:
% = % error in R
R
2
|| R
5
= R
2
R
5
/(R
2
+ R
5
)
With a 0.005% resistor error, DC CMR for the INA117 high
common-mode-voltage unity-gain difference amplifier is
86.5dB. Note that unlike the four resistor difference ampli-
fier, the sensitivity of DC CMR to errors in resistor value is
different for different resistors.
To simulate AC CMR error, a small value capacitor, C
, is
placed in parallel with R
2
to roll-off of CMR with increasing
frequency.
13
14
–In
+In
5
V
O
3
V+
4
V–
R
1
R
3
2
1
Ref
R
2
R
4
8
C
2
A
3
R
5
9
Ref B
Ref A
FIGURE 1b. INA117 High Voltage Difference Amplifier
Macromodel and Node Assignments.
13
14
5
V
O
R
1
R
3
11
12
Ref
R
2
R
4
8
C
2
A
3
4
V–
A
2
3
V+
A
1
R
FB1
R
FB2
9
10
1
+In
2
–In
R
G
R
G1
R
G2
C
C1
C
C2
FIGURE 2. Standard Instrumentation Amplifier Macromodel
and Node Assignments.
FIGURE
DESCRIPTION
1a
1b
2
3
4
5
6
Difference Amp Macromodel Node Assignments
INA117 Difference Amplifier Macromodel
Instrumentation Amp Macromodel Node Assignments
INA103 Macromodel and Node Assignments
INA118 Macromodel and Node Assignments
INA110 Macromodel and Node Assignments
INA120 Internal Gain Setting Resistor Connections
TABLE V. Figure Reference.
13
14
–In
+In
5
V
O
3
V+
4
V–
R
1
R
3
2
1
Sense
Ref
R
2
R
4
8
9
C
2
A
3
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