USBUFxxW6

7/9

Vg

50

Ω

50

Ω

TEST BOARD

UUx

Fig. A9: Analog crosstalk measurements

1

10

100

1,000

-100

-80

-60

-40

-20

0

Frequency (MHz)

Analog crosstalk (dB)

Fig. A10: Typical analog crosstalk results

Figure A9 gives the measurement circuit for the analog crosstalk application. In figure A10, the curve

shows the effect of the D+ cell on the D- cell. In usual frequency range of analog signals (up to 100MHz) the

effect on disturbed line is less than -37dB.

D+

D-

+5V

+5V

74HC04

+5V

Square

Pulse

Generator

74HC04

3.3 V

Rp

Ct

Rt

Ct

Rt

D1

Gnd

D2

D4

D3

3.3 V

Fig. A11: Digital crosstalk measurements configuration

V

Fig. A12: Digital crosstalk results

Figure A11 shows the measurement circuit used to quantify the crosstalk effect in a classical digital appli-

cation.

Figure A12 shows, with a signal from 0 to 5V and

rise time of few ns, the impact on the disturbed line

is less than 250mV peak to peak. No data distur-

bance was noted on the other line.The measure-

ments performed with falling edges gives an

impact within the same range.