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ESDALC6V1P6 데이터시트(PDF) 6 Page - STMicroelectronics |
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ESDALC6V1P6 데이터시트(HTML) 6 Page - STMicroelectronics |
6 / 10 page ESDALC6V1P6 6/10 ® 2. Crosstalk behavior 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 on load RL2 is α2VG2, in fact the real voltage at this point has got an extra value β21VG2. 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. The perturbed line will be more affected if it works with low voltage signal or high load impedance (few k Ω). Figure A7 gives the measurement circuit for the analog crosstalk application. In figure 8, the curve shows the effect of the cell I/O1 on the cell I/O4. In usual frequency range of analog signals (up to 100 MHz) the effect on disturbed line is less than -55dB. Fig. A6: Crosstalk phenomenon. Fig. A7: Analog crosstalk test configuration. Fig. A8: Typical analog crosstalk response. RL1 RL2 αβ 1G1 12G2 V+ V αβ 2G2 21G1 V+ V Line 1 Line 2 VG1 VG2 DRIVERS RECEIVERS RG1 RG2 VG GND I/O1 I/O4 unloaded 50 Ω 50 Ω Port 1 Port 2 100.0k 1.0M 10.0M 100.0M 1.0G -100.00 -90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 0.00 dB f/Hz |
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