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

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

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

Ω).

TEST BOARD

E62

Vg

50

Ω

Port1

50

Ω

Port2

Fig. A5: Analog crosstalk measurements

1

10

100

1,000

-100

-80

-60

-40

-20

0

frequency (MHz)

Analog crosstalk (dB)

Fig. A6: Typical analog crosstalk measurements

Figure A5 gives the measurement circuit for the analog crosstalk application. In figure A6, the curve shows

the effect of the cell I/O5 on the cell I/O3. In usual frequency range of analog signals (up to 100MHz) the

effect on disturbed line is less than -40dB.