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TS616 数据表(PDF) 23 Page - STMicroelectronics

部件名 TS616
功能描述  Dual wide band operational amplifier with high output current
PDF  37 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS616 数据表(HTML) 23 Page - STMicroelectronics

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TS616
Noise measurements
23/37
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
The closed loop gain is:
The six noise sources are:
We assume that 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 Boltzmann's constant, equal to 1374.10-23J/°K. T is the temperature (°K).
+
_
R3
R1
output
R2
iN-
iN+
HP3577
Input noise:
8nV/
√Hz
N1
N2
N3
TS616
eN
+
_
R3
R1
output
R2
iN-
iN+
HP3577
Input noise:
8nV/
√Hz
N1
N2
N3
TS616
eN
A
V
g1
R
fb
R
g
--------
+
==
V2
iNn
R2
×
=
V5
4kTR2
=
V1
eN
1
R2
R1
--------
+
⎝⎠
⎛⎞
×
=
V3
iNp
R3
1
R2
R1
--------
+
⎝⎠
⎛⎞
×
×
=
V4
R2
R1
--------
4kTR1
×
–
=
V6
1
R2
R1
--------
+
⎝⎠
⎛⎞ 4kTR3
=
4kTR F
Δ
4kTR



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