参数资料
型号: 5962F0723201VXC
厂商: STMICROELECTRONICS
元件分类: 运算放大器
英文描述: OP-AMP, 550 MHz BAND WIDTH, CDFP8
封装: ROHS COMPLIANT, HERMETIC SEALED, CERAMIC, FP-8
文件页数: 4/20页
文件大小: 397K
代理商: 5962F0723201VXC
Noise measurements
RHF350
12/20
Doc ID 15604 Rev 2
4
Noise measurements
The noise model is shown in Figure 26.
eN: input voltage noise of the amplifier.
iNn: negative input current noise of the amplifier.
iNp: positive input current noise of the amplifier.
Figure 26.
Noise model
The thermal noise of a resistance R is:
where
ΔF is the specified bandwidth.
On a 1 Hz bandwidth the thermal noise is reduced to:
where k is the Boltzmann's constant, equal to 1,374.E(-23)J/°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
+
_
R3
R1
Output
R2
iN -
iN +
HP3577
Input noise:
8 nV/
√Hz
N1
N2
N3
eN
AM00837
4kTR
ΔF
4kTR
eNo
V1
2
V2
2
V3
2
V4
2
V5
2
V6
2
+++++
=
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