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The crosstalk phenomena are due to the coupling between 2 lines. Coupling factors (

β12 or β21 ) increase

when the gap across lines decreases, particularly in silicon dice. In the example above, the expected signal

signal represents the effect of the crosstalk phenomenon of the line 1 on the line 2. This phenomenon has

to be taken into account when the drivers impose fast digital data or high frequency analog signals. The

perturbed line will be more affected if it works with low voltage signal or high load impedance (few k

Ω)

GND

I/O1

I/O4

unloaded

50

Ω

50

Ω

Port 1

Port 2

Fig. A7: Analog crosstalk test configuration.

GND

I/O1

I/O4

unloaded

50

Ω

50

Ω

Port 1

Port 2

Fig. A8: Typical analog crosstalk response.

GND

I/O4

I/O1

V

unloaded

unloaded

pulse generator

F= 100KHz

t = 20ns

R

0 - 5V

Fig. A9: Digital crosstalk test configuration.

crosstalk

V

Fig. A10: Typical digital crosstalk response.