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THS4501CDG4 Datasheet(PDF) 30 Page - Texas Instruments

Part # THS4501CDG4
Description  WIDEBAND, LOW-DISTORTION, FULLY DIFFERENTIAL AMPLIFIERS
PDF  48 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

THS4501CDG4 Datasheet(HTML) 30 Page - Texas Instruments

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Rg
R
f
)
Rg
Rg )
Rs
2
2
(eni)2
NA: Fully Differential Amplifier; termination = 2Rg
Noise
Source
Scale Factor
(ini)2
Rg2
(iii)2
Rg2
Ni
NA
Rg
Rf
eg
ef
es
Rs
en
No
ini
iii
Rt
et
Ni
Si
No
So
+
−
fully-diff
amp
Rg
Rf
eg
ef
2
Rg
R
f
2
4kTRf
4kTRg
2
Rg
Rg )
Rs
2
2
N
i + 4kTRs
2RtRg
R
t)2Rg
Rs)
2RtRg
R
t)2Rg
2
Rg
R
f
)
Rg
Rg
)
RsRt
2 Rs
)Rt
2
(eni)2
NA: Fully Differential Amplifier
Noise
Source
Scale Factor
(ini)2
Rg2
(iii)2
Rg2
2
N =4kTR
i
S
2R
G
R +2R
S
G
N = (NoiseSource
ScaleFactor)
S
´
A
4kTRt
2RsRG
Rs)2Rg
Rt )
2RsRg
Rs)2Rg
2
F=1+
NA
NI
4kTRf
2
Rg
R
f
2
NF + 10 log (F)
4kTRg
2
Rg
Rg
)
RsRt
2 Rs
)Rt
2
THS4500
THS4501
SLOS350F
– APRIL 2002 – REVISED OCTOBER 2011
www.ti.com
Scaling Factors for Individual Noise Sources
Asseming No Termination Resistance is Used
(that is, RT is Open)
(18)
(19)
(20)
(21)
Figure 111. Noise Sources in a Fully Differential
Amplifier Circuit
Scaling Factors for Individual Noise Sources
(22)
Assuming a Finite Value Termination Resistor
Input Noise With a Termination Resistor
(23)
(12)
Input Noise Assuming No Termination Resistor
(13)
(14)
(24)
Noise Factor and Noise Figure Calculations
(25)
(15)
(26)
(16)
(27)
(17)
30
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Copyright
© 2002–2011, Texas Instruments Incorporated
Product Folder Link(s): THS4500 THS4501



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