Analog Devices AN642 Application Notes
AN-642
APPLICATION NOTE
One Technology Way
9106
and TxDAC+
Products
50
SOURCE
R1
1k
C3
0.1F
R2
1k
CLKCOM
CLKVDD
CLK+
CLK–
R
SERIES
provides the required source termination, while
50
SOURCE
R1
1k
C3
0.1F
R2
1k
CLKCOM
CLKVDD
CLK+
CLK–
R3
1k
R4
1k
C2
1nF
R
TERM
50
C1
1nF
f
C
dB3
1
2 5
0
=
× ×
π
C
C C
C C
=
×
+
1 2
1 2
50
SOURCE
R1
1k
C3
0.1F
R2
1k
CLKCOM
CLKVDD
CLK+
CLK–
R3
1k
R4
1k
C2
C1
L
MATCH
C
IN
dc bias resistors.
50
SOURCE
CLK+
CLK–
L2
C
IN
R
IN
1k
R
IN
1k
L1
C1
C2
AC GROUND
AC GROUND
2
1
2
0
π × =×f
L C
IN
L
f C
IN
2
1
2
0
2
=
×
(
)
×π
source (
and
and
R R
L
C
S IN
MATCH
× =
1
f
L C
0
1
2 1=×π
MATCH
gives:
gives:
C
f R
R
S IN
MATCH
=
× ×
1
20π
= 100 MHz,
= 1 k
= 1 k
= 7.12 pF
= 7.12 pF
L
R R
f
S IN
1
2
0
=
×
×π
= 100 MHz,
= 1 k
= 1 k
L
L L
L L
MATCH
=
×
+
1 2
1 2
= 263 nH.
= 263 nH.
so that the total series capacitance
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