TS615IPWT(2004) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TS615IPWT Datasheet PDF : 36 Pages
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Noise Measurements
7 Noise Measurements
The noise model is shown in Figure 62, where:
l eN: input voltage noise of the amplifier
l iNn: negative input current noise of the amplifier
l iNp: positive input current noise of the amplifier
Figure 62. Noise model
R3
iN+
+
TS615
_
N3 iN- eN
output
HP3577
Input noise:
8nV/√Hz
N2
R2
R1
N1
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:
4 k T R DF
where ∆F is the specified bandwidth.
TS615
23/36
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