RMS Noise with R
參數(shù)資料
型號: AD8066ARM-EBZ
廠商: Analog Devices Inc
文件頁數(shù): 19/29頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR AD8066ARM
標(biāo)準(zhǔn)包裝: 1
每 IC 通道數(shù): 2 - 雙
放大器類型: 電壓反饋
板類型: 裸(未填充)
已供物品:
已用 IC / 零件: 8-MSOP 封裝
AD8065/AD8066
Rev. J | Page 25 of 28
Table 5. RMS Noise Contributions of Photodiode Preamp
Contributor
Expression
RMS Noise with RF = 50 kΩ, CS = 15 pF, CF = 2 pF
RF (×2)
57
1
4
2
.
f
R
kT
2
F
×
64.5 μV
Amp to f1
1
f
VEN ×
2.4 μV
Amp (f2 – f1)
1
2
F
D
F
M
S
f
C
VEN
×
+
×
2
31 μV
Amp to (past f2)
57
.
1
2
×
+
×
3
F
D
M
S
f
C
VEN
260 μV
270 μV (Total)
VCC
VEE
1/2
AD8066
4.7
μF
0.1
μF
RS1
4.7
μF
0.1
μF
VN
2.2pF
500
Ω
R2
VP
1/2
AD8066
4.7
μF
0.1
μ F
4.7
μF
0.1
μ F
AD8065
4.7
μF
0.1
μF
4.7
μ F
0.1
μ F
VO
RG
VCC
VEE
VCC
VEE
500
Ω
R4
RS2
500
Ω
R1
500
Ω
R3
RF = 500Ω
2.2pF
RF = 500Ω
02916-E-060
Figure 60. High Speed Instrumentation Amplifier
HIGH SPEED JFET INPUT INSTRUMENTATION
AMPLIFIER
Figure 60 shows an example of a high speed instrumentation
amplifier with high input impedance using the
AD8065/AD8066. The dc transfer function is
()
+
=
G
P
N
OUT
R
V
1000
1
For G = +1, it is recommended that the feedback resistors for
the two preamps be set to a low value (for instance 50 Ω for
50 Ω source impedance). The bandwidth for G = +1 is 50 MHz.
For higher gains, the bandwidth is set by the preamp, equaling
(
) (
)
F
G
CR
3dB
R
f
Inamp
×
=
2
/
Common-mode rejection of the in-amp is primarily
determined by the match of the resistor ratios R1:R2 to R3:R4.
It can be estimated
()
() 2
1
2
1
δ
+
δ
δ
=
CM
O
V
The summing junction impedance for the preamps is equal to
RF || 0.5(RG). This is the value to be used for matching purposes.
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