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AD8331 Datasheet(PDF) 21 Page - Analog Devices

Part # AD8331
Description  Ultralow Noise VGAs with Preamplifier and Programmable R
PDF  56 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8331 Datasheet(HTML) 21 Page - Analog Devices

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AD8331/AD8332/AD8334
Rev. G | Page 21 of 56
18nF
22pF
IN
OUT
NETWORK ANALYZER
28Ω
237Ω
28Ω
1:1
50Ω
50Ω
0.1µF
OR
1µF
237Ω
10kΩ
VGA
FB*
120nH
*FERRITE BEAD
LMD
0.1µF
LNA
0.1µF
OR
1µF
INH
0.1µF
OR
1µF
0.1µF
0.1µF
Figure 58. Test Circuit—Group Delay vs. Frequency for Two Values of AC Coupling
18nF
22pF
28Ω
237Ω
28Ω
0.1µF
237Ω
50Ω
1:1
OUT
NETWORK
ANALYZER
50Ω
270Ω
FB*
120nH
*FERRITE BEAD
LMD
0.1µF
DUT
0.1µF
0.1µF
INH
Figure 59. Test Circuit—LNA Input Impedance vs. Frequency in Standard and Smith Chart (S11) Formats
22pF
28Ω
237Ω
28Ω
1:1
0.1µF
0.1µF
237Ω
IN
OUT
NETWORK ANALYZER
50Ω
50Ω
VGA
LNA
FB*
120nH
*FERRITE BEAD
LMD
0.1µF
0.1µF
INH
0.1µF
0.1µF
0.1µF
Figure 60. Test Circuit—Frequency Response for Unterminated LNA, Single-Ended
18nF
22pF
28Ω
237Ω
28Ω
0.1µF
INH
237Ω
1:1 IN
NETWORK
ANALYZER
50Ω
270Ω
FB*
120nH
*FERRITE BEAD
LMD
0.1µF
DUT
0.1µF
0.1µF
Figure 61. Test Circuit—Short-Circuit, Input-Referred Noise



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