參數(shù)資料
型號(hào): OPA227PG4
英文描述: High Precision, Low Noise OPERATIONAL AMPLIFIERS
中文描述: 高精度,低噪聲運(yùn)算放大器
文件頁(yè)數(shù): 13/25頁(yè)
文件大小: 749K
代理商: OPA227PG4
OPA227, 2227, 4227
OPA228, 2228, 4228
SBOS110A
13
www.ti.com
FIGURE 5. Noise Calculation in Gain Configurations.
Where e
S
=
4kTR
S
= thermal noise of R
S
e
1
=
4kTR
1
= thermal noise of R
1
R
1
e
2
=
4kTR
2
= thermal noise of R
2
2
1
R
Noise at the output:
2
E
R
R
e
e
e
i R
e
i R
R
R
O
n
S
S
2
2
1
2
2
1
2
2
2
2
2
2
2
2
1
2
1
1
=
+
+
+
+
(
)
+
+
(
)
+
Where e
S
=
4kTR
S
= thermal noise of R
S
e
1
=
4kTR
1
= thermal noise of R
1
e
2
=
4kTR
2
= thermal noise of R
2
Noise at the output:
R
R
R
S
2
1
+
R
R
R
S
2
1
+
E
R
+
R
R
e
e
e
i R
e
O
S
n
S
2
2
1
2
2
1
2
2
2
2
2
2
1
=
+
+
+
+
(
)
+
R
1
R
2
E
O
R
1
R
2
E
O
R
S
V
S
R
S
V
S
Noise in Noninverting Gain Configuration
Noise in Inverting Gain Configuration
For the OPA227 and OPA228 series op amps at 1kHz, e
n
= 3nV/
Hz and i
n
= 0.4pA/
Hz.
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