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ADA4350ARUZ-R7 Datasheet(PDF) 34 Page - Analog Devices

No. de pieza ADA4350ARUZ-R7
Descripción Electrónicos  FET Input Analog Front End with ADC Driver
PDF  38 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADA4350ARUZ-R7 Datasheet(HTML) 34 Page - Analog Devices

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Data Sheet
ADA4350
Rev. B | Page 33 of 37
OPEN-LOOP GAIN
f
fP
G = 1
f
fX
fGBW
G = 1 + CS/CF
fZ
fN
I TO V GAIN
–135°
–90°
–45°
0°
45°
90°
G = RFCS(s)
Figure 60. Signal and Noise Gain and Phase of the Transimpedance Amplifier
Design with Compensation
The dominant output noise sources in the transimpedance
amplifier design are the input voltage noise of the amplifier,
VNOISE, and the resistor noise due to RF. The effect due to the
current noise is negligible in comparison. The gray line in
Figure 60 shows the noise gain and phase over frequencies for
the transimpedance amplifier. The noise bandwidth is at the fN
frequency, and is calculated by
F
F
S
GBW
N
C
C
C
f
f
/
)
(
(9)
Table 17 shows the dominant noise sources (RF and VNOISE) for
the transimpedance amplifier when it has a 45° phase margin for
the maximum bandwidth, and in this case, fZ = fX = fN.
Table 17. RMS Noise Contributions of Transimpedance
Amplifier
Contributor
Expression
RF
2
π
N
F
f
R
4kT
VNOISE
N
F
D
F
M
S
NOISE
f
C
2C
C
C
C
V
2
π



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