參數(shù)資料
型號(hào): TSH350ID
廠商: 意法半導(dǎo)體
英文描述: 550 MHz, Low Noise Current Feedback Amplifier
中文描述: 550兆赫,低噪聲電流反饋放大器
文件頁(yè)數(shù): 13/21頁(yè)
文件大?。?/td> 383K
代理商: TSH350ID
Noise Measurements
TSH350
13/21
5 Noise Measurements
The noise model is shown in
Figure 32
, 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
:
Equation 1
Equation 2
Figure 32: 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
+
+
+
+
+
=
eNo2
eN2
g2
iNn2
R22
iNp2
+
×
+
×
R32
×
g2
×
R1
-------
2
4kTR1
4kTR2
1
R1
-------
+
2
4kTR3
×
+
+
×
+
=
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