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| 型号： | AD9273BSVZ-40 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/48页 |
| 文件大小： | 0K |
| 描述： | IC ADC OCT 12BIT 40MSPS 100-TQFP |
| 标准包装： | 1 |
| 类型： | AAF，ADC，交叉点开关，LNA，VGA |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 40M |
| 数据接口： | 串行，SPI? |
| 电压电源： | 模拟和数字 |
| 电源电压： | 1.8V，3V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-TQFP 裸露焊盘 |
| 供应商设备封装： | 100-TQFP-EP（14x14） |
| 包装： | 托盘 |
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AD9273
Rev. B | Page 24 of 48
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 1.4 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 41.
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 =
0
70
30
-10
4
Figure 41. Input Configurations
resistance (RS) results using these configurations and an input-
referred noise voltage of 6 nV/√Hz for the VGA. Unterminated
(RFB = ∞) operation exhibits the lowest equivalent input noise
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 LNA’s input
voltage noise generator. 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 42 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 1.0 dB,
respectively.
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
UR
E
(
d
B)
07
03
0-
18
2
UNTERMINATED
SHUNT TERMINATION
ACTIVE
TERMINATION
Figure 42. Noise Figure vs. RS for Shunt Termination,
Active Termination Matched, and Unterminated Inputs, VGAIN = 0.8 V
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
UR
E
(
d
B)
07
03
0-
18
3
UNTERMINATED
RIN = 200
RIN = 100
RIN = 75
RIN = 50
Figure 43. Noise Figure vs. RS for Various Fixed Values of RIN,
Active Termination Matched Inputs, VGAIN = 0.8 V
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