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ADA4805-2ARMZ-R7 Scheda tecnica(PDF) 19 Page - Analog Devices

Il numero della parte ADA4805-2ARMZ-R7
Spiegazioni elettronici  0.2 關V/째C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifiers
PDF  25 Pages
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADA4805-2ARMZ-R7 Scheda tecnica(HTML) 19 Page - Analog Devices

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Data Sheet
ADA4805-1/ADA4805-2
NOISE CONSIDERATIONS
Figure 54 illustrates the primary noise contributors for the
typical gain configurations. The total output noise (vn_out) is the
root sum square of all the noise contributions.
RG
RS
in–
RF
vn
4kTRS
vn_RS =
4kTRG
vn_RG =
vn_RF =
+ vn_out –
4kTRF
in+
Figure 54. Noise Sources in Typical Connection
The output noise spectral density is calculated by
[
]
2
2
2
2
2
2
2
_
4
4
1
4
F
n
G
G
F
n
S
n
G
F
F
out
n
R
i
kTR
R
R
v
R
i
kTRs
R
R
kTR
v
−
+
+


+
+
+


+
+
=
where:
k is Boltzmann’s constant.
T is the absolute temperature in degrees Kelvin.
RF and RG are the feedback network resistances, as shown in
Figure 54.
RS is the source resistance, as shown in Figure 54.
in+ and in− represent the amplifier input current noise spectral
density in pA/√Hz.
vn is the amplifier input voltage noise spectral density in
nV/√Hz.
Source resistance noise, amplifier input voltage noise (vn), and
the voltage noise from the amplifier input current noise
(in+ × RS) are all subject to the noise gain term (1 + RF/RG).
Figure 55 shows the total referred to input (RTI) noise due to
the amplifier vs. the source resistance. Note that with a
5.9 nV/√Hz input voltage noise and 0.6 pA/√Hz input current
noise, the noise contributions of the amplifier are relatively
small for source resistances from approximately 2.6 kΩ to
47 kΩ.
The Analog Devices silicon germanium (SiGe) bipolar process
makes it possible to achieve a low noise of 5.9 nV/√Hz for the
ADA4805-1/ADA4805-2. This noise is much improved
compared to similar low power amplifiers with a supply current
in the range of hundreds of microamperes.
1
10
100
1000
100
1k
10k
100k
1M
SOURCE RESIST
ANCE (Ω)
TOTAL NOISE
SOURCE RESISTANCE NOISE
AMPLIFIER NOISE
SOURCE RESIST
ANCE = 2.6kΩ
SOURCE RESIST
ANCE = 47kΩ
Figure 55. RTI Noise vs. Source Resistance
Rev. B | Page 19 of 25



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