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RHF350A Datasheet(PDF) 13 Page - STMicroelectronics

Part # RHF350A
Description  Rad-hard 550 MHz low noise operational amplifier
PDF  26 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RHF350A Datasheet(HTML) 13 Page - STMicroelectronics

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Figure 26. Circuit for 5 V single supply
+
_
R2
750 Ω
R
G
IN
+5 V
100 Ω
OUT
R
fb
10 µF
+ 1 µF
100 µ F
R1
750 Ω
+5 V
10 nF
R
in
1 kΩ
C
G
+
6.2
Noise measurements
The noise model is shown in Figure 28. Noise model.
•
eN: input voltage noise of the amplifier
•
iNn: negative input current noise of the amplifier
•
iNp: positive input current noise of the amplifier
Figure 27. Noise model
+
_
R3
R1
Output
R2
iN-
iN+
HP3577
Input noise:
8 nV/ Hz
N1
N2
N3
eN
√
The thermal noise of a resistance R is:
4kT R∆F
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:
4kT R
RHF350A
Noise measurements
DS6219 - Rev 8
page 13/26



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