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AD8099ACPI-EBZ bảng dữ liệu(PDF) 21 Page - Analog Devices

tên linh kiện AD8099ACPI-EBZ
Giải thích chi tiết về linh kiện  Ultralow Distortion, High Speed 0.95 nV/?뺿z Voltage Noise Op Amp
PDF  29 Pages
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nhà sản xuất  AD [Analog Devices]
Trang chủ  http://www.analog.com
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AD8099ACPI-EBZ bảng dữ liệu(HTML) 21 Page - Analog Devices

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AD8099
Data Sheet
Rev. D | Page 20 of 28
FREQUENCY (MHz)
–1
3000
1
10
8
9
7
6
5
4
3
2
1
0
VS = ±5V
G = +2
RLOAD = 1k
SOIC PACKAGE
10
100
1000
RF = RG = 200
RF = RG = 250
RF = RG = 300
FREQUENCY (MHz)
1
–1
10
9
8
7
6
5
4
3
2
1
0
10
100
1000
3000
CF = 1pF
CF = 0.5pF
CF = 1.5pF
VS = ±5V
G = +2
RLOAD = 1k
SOIC PACKAGE
FREQUENCY (MHz)
0
10000
1
12
10
11
9
8
7
6
5
4
3
2
1
VS = ±5V
G = +2
RLOAD = 1k
SOIC PACKAGE
10
100
1000
RS = 0
RS = 50
RS = 20
1
8
4
7
5
3
6
2
AD8099
C5
0.1
F
CC
CF
C1
C4
10
F
C2
10
F
C3
0.1
F
RC
RF
RG
RS
R1
+VS
–VS
VOUT
SOIC PINOUT SHOWN
VIN
DISABLE
Figure 68. Frequency Response for Various Values of RF, CF, RS
TOTAL OUTPUT NOISE CALCULATIONS AND DESIGN
To analyze the noise performance of an amplifier circuit, the
individual noise sources must be identified. Then determine if
the source has a significant contribution to overall noise perfor-
mance of the amplifier. To simplify the noise calculations, we
will work with noise spectral densities, rather than actual
voltages to leave bandwidth out of the expressions (noise
spectral density, which is generally expressed in nV/Hz, is
equivalent to the noise in a 1 Hz bandwidth).
The noise model shown in Figure 69 has six individual noise
sources: the Johnson noise of the three resistors, the op amp
voltage noise, and the current noise in each input of the
amplifier. Each noise source has its own contribution to the
noise at the output. Noise is generally specified RTI (referred to
input), but it is often simpler to calculate the noise referred to
the output (RTO) and then divide by the noise gain to obtain
the RTI noise.
All resistors have a Johnson noise of (4kBTR), where k is
Boltzmann’s Constant (1.38 × 10–23 J/K), T is the absolute
temperature in Kelvin, B is the bandwidth in Hz, and R is the
resistance in ohms. A simple relationship, which is easy to
remember, is that a 50 Ω resistor generates a Johnson noise of
1 nVHz at 25C. The AD8099 amplifier has roughly the same
equivalent noise as a 50 Ω resistor.



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