DVIULC6-4SC6 Technical information
Doc ID 11599 Rev 4 9/12
3.4 Crosstalk behavior
Figure 15. Crosstalk phenomena
The crosstalk phenomena is due to the coupling between 2 lines. The coupling factor (
12
or
21
) increases when the gap across lines decreases, particularly in silicon dice. In the
example above the expected signal on load R
L2
is
2
V
G2
, in fact the real voltage at this point
has got an extra value
21
V
G1
. This part of the V
G1
signal represents the effect of the
crosstalk phenomenon of line 1 on line 2. This phenomenon has to be taken into account
when the drivers impose fast digital data or high frequency analog signals in the disturbing
line. The perturbed line will be more affected if it works with low voltage signal or high load
impedance (few k).
Figure 16. Analog crosstalk measurements
Figure 16 gives the measurement circuit for the analog application. In usual frequency range
of analog signals (up to 240 MHz) the effect on disturbed line is less than -45 dB (see
Figure 8).
As the DVIULC6-4SC6 is designed to protect high speed data lines, it must ensure a good
transmission of operating signals. The frequency response (Figure 5) gives attenuation
information and shows that the DVIULC6-4SC6 is well suitable for data line transmission up
to 1.65 Gb/s.
Line 1
Line 2
V
G1
V
G2
R
G1
R
G2
DRIVERS
R
L1
R
L2
RECEIVERS
α
β
+
1
12
V
G1
V
G2
α
β
+
2
21
V
G2
V
G1
SPECTRUM ANALYSER
50 W
TRACKING GENERATOR
Vg
50 W
TEST BOARD
C=100nF
SPECTRUM ANALYSER
V
out
50
Ω
TRACKING GENERATOR
V
g
V
in
50
Ω
TEST BOARD
V
cc
C=100nF
DVIULC6
