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TS615IPWT Datasheet(PDF) 23 Page - STMicroelectronics

No. de pieza TS615IPWT
Descripción Electrónicos  DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
PDF  36 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS615IPWT Datasheet(HTML) 23 Page - STMicroelectronics

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Noise Measurements
TS615
23/36
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
The closed loop gain is:
The six noise sources are:
We assume that the thermal noise of a resistance R is:
where
∆F is the specified bandwidth.
Figure 62. Noise model
+
_
R3
R1
output
R2
iN-
iN+
HP3577
Input noise:
8nV/
√Hz
N1
N2
N3
TS615
eN
+
_
R3
R1
output
R2
iN-
iN+
HP3577
Input noise:
8nV/
√Hz
N1
N2
N3
TS615
eN
A
V
g1
R
fb
R
g
----------
+
==
V2
iNn
R2
×
=
V5
4kT R2
=
V1
eN
1
R2
R1
--------
+


×
=
V3
iNp
R3
1
R2
R1
--------
+


×
×
=
V4
R2
R1
--------
4kTR1
×
–
=
V6
1
R2
R1
--------
+

 4kTR3
=
4kTR F
D



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