參數(shù)資料
型號: TSH300ID
廠商: 意法半導(dǎo)體
元件分類: 運(yùn)動控制電子
英文描述: Ultra Low-Noise High-Speed Operational Amplifier
中文描述: 超低噪音高速運(yùn)算放大器
文件頁數(shù): 14/18頁
文件大?。?/td> 398K
代理商: TSH300ID
Noise Measurements
TSH300
14/18
5
Noise Measurements
The noise model is shown in
Figure 45
, where:
eN: input voltage noise of the amplifier
iNn: negative input current noise of the amplifier
iNp: positive input current noise of the amplifier
The thermal noise of a resistance R is:
where
F is the specified bandwidth.
On a 1Hz bandwidth the thermal noise is reduced to
where k is the Boltzmann's constant, equal to 1,374.10-23J/°K. T is the temperature (°K).
The output noise eNo is calculated using the Superposition Theorem. However eNo is not the
simple sum of all noise sources, but rather the square root of the sum of the square of each
noise source, as shown in Equation 1:
Figure 45. Noise model
+
_
R3
R1
output
R2
iN-
iN+
8nV/
Hz
N1
N2
N3
eN
HP3577
Input noise:
4kTR
F
4kTR
eNo
V12
V22
V32
V42
V52
V62
+
+
+
+
+
(Equation 1)
=
eNo2
eN2
g2
iNn2
R22
iNp2
+
×
+
×
R32
×
g2
×
-------
(
)
2
4kTR1
4kTR2
g2
4kTR3
(Equation 2)
×
+
+
×
+
=
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