TS616 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TS616' PDF : 36 Pages View PDF
TS616
7
Noise measurements
The noise model is shown in Figure 62, where:
● eN: input voltage noise of the amplifier
● iNn: negative input current noise of the amplifier
● iNp: positive input current noise of the amplifier
Figure 62. Noise model
Noise measurements
R3
iN+
+
TS616
_
N3 iN- eN
N2
R2
R1
N1
output
HP3577
Input noise:
8nV/√Hz
The closed loop gain is:
The six noise sources are:
AV
=
g
=
1 + R-----f--b-
Rg
V1
=
eN ×
⎛
⎝
1
+
RR-----21--⎠⎞
V2 = iNn × R2
V3 = iNp × R3 × ⎝⎛1 + RR-----21--⎠⎞
V4 = –RR-----21-- × 4kTR1
V5 = 4kTR2
V6 = ⎝⎛1 + RR-----21--⎠⎞ 4kTR3
We assume that the thermal noise of a resistance R is:
4kTRΔF
where ΔF is the specified bandwidth.
On a 1 Hz bandwidth the thermal noise is reduced to:
4kTR
where k is Boltzmann's constant, equal to 1374.10-23J/°K. T is the temperature (°K).
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