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AD8350AR20-EVAL Fiches technique(PDF) 9 Page - Analog Devices

No de pièce AD8350AR20-EVAL
Description  Low Distortion 1.0 GHz Differential Amplifier
Download  11 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD8350AR20-EVAL Fiches technique(HTML) 9 Page - Analog Devices

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REV. 0
AD8350
–9–
Figure 30 shows how the AD8350 input can be matched for a
single-ended drive. The unused input is ac-coupled to ground
using a low impedance (i.e., high value) capacitance. The S-
Parameters for this configuration are shown in Tables III and
IV. These values assume a single-ended source impedance of
50
Ω and a differential load impedance of 50 Ω. As in the case
of a differential drive, a simultaneous conjugate match must be
performed to correctly match both input and output.
8
7
6
5
1
2
3
4
AD8350
ENBL
(+5V)
+VS (+5V TO +10V)
C2
0.1 F
C2
C2
0.001 F
C1
L2
L1
Figure 30. Matching Circuit for Single-Ended Drive
Evaluation Board
Figure 31 shows the schematic of the AD8350 evaluation board
as it is shipped from the factory. The board is configured to
allow easy evaluation using single-ended 50
Ω test equipment.
The input and output transformers have a 4-to-1 impedance
ratio and transform the AD8350’s 200
Ω input and output
impedances to 50
Ω. In this mode, 0 Ω resistors (R1 and R4)
are required.
To allow compensation for the insertion loss of the transform-
ers, a calibration path is provided at Test In and Test Out. This
consists of two transformers connected back to back.
To drive and load the board differentially, transformers T1 and
T2 should be removed and replaced with four 0
Ω resistors
(0805 size); Resistors R1 and R4 (0
Ω) should also be removed.
This yields a circuit with a broadband input and output imped-
ance of 200
Ω. To match to impedances other than this, match-
ing components (0805 size) can be placed on pads C1, C2, C3,
C4, L1 and L2.
8
7
6
5
1
2
3
4
AD8350
+VS
C5
0.1 F
L1
(OPEN)
L2
(OPEN)
C3
0.001 F
C2
0.001 F
C4
0.001 F
+VS
1
2
3
A
B
SW1
61
R2
0
C1
0.001 F
R1
0
T1: TC4-1W
(MINI CIRCUITS)
IN–
IN+
R3
0
6
T2: TC4-1W
(MINI CIRCUITS)
R4
0
OUT–
OUT+
16
T4: TC4-1W
(MINI CIRCUITS)
TEST OUT
61
T3: TC4-1W
(MINI CIRCUITS)
TEST IN
1
Figure 31. AD8350 Evaluation Board


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