Far-End Crosstalk Voltage for a CMOS-IC Inverter Load

Yasuaki NOGUCHI  Nobuyuki MIYAO  Fujihiko MATSUMOTO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E86-A   No.6   pp.1451-1457
Publication Date: 2003/06/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Papers Selected from 2002 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2002))
far-end crosstalk,  CMOS inverter,  microstrip lines,  nonlinear impedance,  clamp diode,  

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In transient analyzing of a crosstalk, the crosstalk waveform can be obtained with a commercial simulator such as SPICE simulation or FDTD (Finite Difference Time Domain) simulation. In case of using a simple model, a CMOS-IC load is considered as a constant capacitance load in crosstalk simulation. However, the semiconductor devices, such as CMOS-IC, have a characteristic of nonlinear impedance depending on the input voltage. We measured the far-end crosstalk of two parallel microstrip lines for a CMOS inverter (74HC04) load by changing the magnitude of the input step voltage. As the result, we found that the far-end crosstalk for the CMOS inverter load dose not necessarily depend on the input capacitance of the CMOS inverter.