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KBMF Datasheet(PDF) 5 Page - STMicroelectronics |
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KBMF Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 8 page KBMF 5/8 4. CROSSTALK BEHAVIOR The crosstalk phenomena is due to the coupling between 2 lines. The coupling factor ( β12 or β21 ) increases when the gap across lines decreases, this is the reason why we provide crosstalk measurements for monolithic device to guarantee negligeable crosstalk between the lines. In the example above the expected signal on load RL2 is α2VG2, in fact the real voltage at this point has got an extra value β21VG1. This part of the VG1 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 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). Figure 8 gives the measurement circuit for the analog crosstalk application. In figure 9, the curve shows the effect of the Data line on the CLK line. In usual frequency range of analog signals (up to 100MHz) the effect on disturbed line is less than -37dB. Figure 7: Crosstalk phenomena Figure 8: Analog Crosstalk measurements configuration Figure 9: Typical Analog Crosstalk meas- urement Line 1 Line 2 VG1 VG2 RG1 RG2 DRIVERS RL1 RL2 RECEIVERS αβ 1G1 12G2 V+ V αβ 2G2 21G1 V+ V 50 Ω RF IN Vg 50 Ω TG OUT TEST BOARD 1 10 100 1,000 -120 -100 -80 -60 -40 -20 0 F (MHz) crosstalk (dB) |
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