參數(shù)資料
型號： AD9272BSVZ-40
廠商： Analog Devices Inc
文件頁數(shù)： 17/44頁
文件大?。?/td> 0K
描述： IC ADC OCT 12BIT 40MSPS 100-TQFP
設(shè)計資源： Powering AD9272 with ADP5020 Switching Regulator PMU for Increased Efficiency (CN0135)
特色產(chǎn)品： AD9272: Octal LNA/VGA/AAF/ADC and Crosspoint Switch
標(biāo)準(zhǔn)包裝： 1
類型： AAF，ADC，交叉點(diǎn)開關(guān)，LNA，VGA
分辨率（位）： 12 b
采樣率（每秒）： 40M
數(shù)據(jù)接口： 串行
電壓電源： 模擬和數(shù)字
電源電壓： 1.8V，3V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 100-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 100-TQFP-EP（14x14）
包裝： 托盤
產(chǎn)品目錄頁面： 780 (CN2011-ZH PDF)
配用： AD9272-65EBZ-ND - BOARD EVAL AD9272
AD9272
Rev. C | Page 24 of 44
LNA Noise
The short-circuit noise voltage (input-referred noise) is an impor-
tant limit on system performance. The short-circuit input-referred
noise voltage for the LNA is 0.85 nV/√Hz at a gain of 21.3 dB,
including the VGA noise at a VGA postamp gain of 27 dB. These
measurements, which were taken without a feedback resistor,
provide the basis for calculating the input noise and noise figure
(NF) performance of the configurations shown in Figure 40.
VOUT
UNTERMINATED
+
–
LI-x
RIN
RS
VOUT
RESISTIVE TERMINATION
+
–
LI-x
RIN
RS
VOUT
ACTIVE IMPEDANCE MATCH
+
–
LI-x
RIN
RFB
1 + A/2
RS
RIN =
07
02
9-
10
4
Figure 40. Input Configurations
Figure 41 and Figure 42 are simulations of noise figure vs. RS
results using these configurations and an input-referred noise
voltage of 3.8 nV/√Hz for the VGA. Unterminated (RFB = ∞)
operation exhibits the lowest equivalent input noise and noise
figure. Figure 42 shows the noise figure vs. source resistance
rising at low RS—where the LNA voltage noise is large compared
with the source noise—and at high RS due to the noise contribution
from RFB. The lowest NF is achieved when RS matches RIN.
The main purpose of input impedance matching is to improve the
transient response of the system. With resistive termination, the
input noise increases due to the thermal noise of the matching
resistor and the increased contribution of the input voltage
noise generator of the LNA. With active impedance matching,
however, the contributions of both are smaller (by a factor of
1/(1 + LNA Gain)) than they would be for resistive termination.
Figure 41 shows the relative noise figure performance. In this
graph, the input impedance was swept with RS to preserve the
match at each point. The noise figures for a source impedance of
50 Ω are 7.3 dB, 4.2 dB, and 2.8 dB for the resistive termination,
active termination, and unterminated configurations, respectively.
The noise figures for 200 Ω are 4.5 dB, 1.7 dB, and 1 dB,
respectively.
Figure 42 shows the noise figure as it relates to RS for various values
of RIN, which is helpful for design purposes.
10
100
1k
0
1.5
3.0
4.5
6.0
7.5
9.0
10.5
12.0
RS ()
NO
IS
E
F
IG
U
RE
(
d
B)
UNTERMINATED
RESISTIVE TERMINATION
ACTIVE TERMINATION
07
02
9-
1
82
Figure 41. Noise Figure vs. RS for Resistive Termination,
Active Termination Matched, and Unterminated Inputs, VGAIN = 0.8 V
10
100
1k
0
1
2
3
4
5
6
7
8
RS ()
NO
IS
E
F
IG
U
RE
(
d
B)
RIN = 50
RIN = 75
RIN = 100
RIN = 200
UNTERMINATED
07
02
9-
1
83
Figure 42. Noise Figure vs. RS for Various Fixed Values of RIN,
Active Termination Matched Inputs, VGAIN = 0.8 V
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