5962F0723301VXC View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'5962F0723301VXC' PDF : 22 Pages View PDF
RHF310
4
Noise measurements
The noise model is shown in Figure 24.
● eN: input voltage noise of the amplifier.
● iNn: negative input current noise of the amplifier.
● iNp: positive input current noise of the amplifier.
Figure 24. Noise model
Noise measurements
R3
N3
+
iN +
_
iN -
eN
Output
HP3577
Input noise:
8 nV/√Hz
R2
N2
R1
N1
The thermal noise of a resistance R is:
4kTRΔF
AM00837
where ΔF is the specified bandwidth, and k is the Boltzmann's constant, equal to
1,374.10-23J/°K. T is the temperature (°K).
On a 1 Hz bandwidth the thermal noise is reduced to:
4kTR
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
eNo = V12 + V22 + V32 + V42 + V52 + V62
Doc ID 15577 Rev 3
13/22
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