Transcription of Termination techniques for high-speed digital circuits
{{id}} {{{paragraph}}}
Example: air traffic controller
Termination techniques for high-speed digital circuits
1 Crosstalk Tzong-Lin Wu, Department of Electrical Engineering National Taiwan University 2 Topics: Introduction Transmission lines equations for coupled lines symmetrical lines and symmetrically driven homogeneous medium symmetrical lines in homogeneous medium symmetrical lines and asymmetrical driven Qualitative description of crosstalk Terminations Measurement of crosstalk parameters How crosstalk noise can be reduced 3 Introduction Three characteristics: of noise at near end is opposite to that at the far end. duration at near end is larger than that at the far end. magnitude at near end is smaller than that at the far end. 4 Introduction : Physical Geometry of Coupled Lines Two kind of coupling: coupling coupling 5 Introduction: cross-talk mechanism of the inductive coupling Qualitative understanding of the coupling mechanism How about the cross-talk mechanism of the capacitive coupling ?? 6 Lm Cm Lm Lm Lm Cm Cm A B C D Driving signal Forward coupling Reverse coupling Tp Tr 2Tp A B D C Tp Tr 2Tp A B D C Rise and fall times same as input Derivative of input signal (negative) Total coupled areas are the same Inductive Capacitive 7 Coupled lines equations VzVzzLztIzLztIzIzIzzCtVzzCtVzzVzzmm11112 111112()()()()()()()()()[()()]' 8 Coupled lines equations dVzdzLtIzdIzdzCtVz()()()() LllllLLLLC ccccCCCCCCCCCC mmmmmmmm LNMOQP LNMOQP LNMOQP LNMOQP LNMOQP1112212212112112221212'' Matrix forms where L 1, 2 : self-inductance per unit length of line
18 Impedance trends for the even- and odd-modes 1. High-impedance traces exhibit significantly more impedance variation than do the …
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: