参数资料
型号: AD8331ARQ-REEL
厂商: Analog Devices Inc
文件页数: 13/56页
文件大小: 0K
描述: IC VGA SINGLE W/PREAMP 20-SSOP
产品变化通告: Product Discontinuance 27/Oct/2011
设计资源: Interfacing the High Frequency AD8331 to AD9215 (CN0096)
标准包装: 2,500
系列: X-AMP®
类型: 可变增益放大器
应用: 信号处理
安装类型: 表面贴装
封装/外壳: 20-SSOP(0.154",3.90mm 宽)
供应商设备封装: 20-QSOP
包装: 带卷 (TR)
配用: AD8331-EVALZ-ND - BOARD EVAL FOR AD8331
AD8331/AD8332/AD8334
Rev. G | Page 20 of 56
TEST CIRCUITS
MEASUREMENT CONSIDERATIONS
Figure 55 through Figure 68 show typical measurement
configurations and proper interface values for measurements
with 50 Ω conditions.
Short-circuit input noise measurements are made as shown in
Figure 62. The input-referred noise level is determined by
dividing the output noise by the numerical gain between Point A
and Point B and accounting for the noise floor of the spectrum
analyzer. The gain should be measured at each frequency of
interest and with low signal levels because a 50 Ω load is driven
directly. The generator is removed when noise measurements
are made.
0
31
99
-0
55
LMD
18nF
22pF
FB*
120nH
*FERRITE BEAD
IN
OUT
0.1F
DUT
NETWORK ANALYZER
0.1F
28
237
28
1:1
50
270
INH
237
0.1F
Figure 55. Test Circuit—Gain and Bandwidth Measurements
10k
031
99
-05
6
LMD
18nF
22pF
FB*
120nH
*FERRITE BEAD
IN
OUT
0.1F
VGN
DUT
NETWORK ANALYZER
0.1F
28
237
28
1:1
50
INH
237
0.1F
Figure 56. Test Circuit—Frequency Response for Various Matched Source Impedances
03
19
9-
05
7
LMD
22pF
FB*
120nH
*FERRITE BEAD
IN
OUT
0.1F
VGN
DUT
NETWORK ANALYZER
0.1F
28
237
28
1:1
50
INH
237
0.1F
Figure 57. Test Circuit—Frequency Response for Unterminated LNA, RS = 50 Ω
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