Effective low-power CMOS terminating circuit for coupled transmission lines

Abstract

An effective low-power CMOS terminating circuit for coupled transmission lines is described. This CMOS terminating circuit substitutes for a terminating resistor at the receiving end of the line in order to provide substantial benefits in minimizing power dissipation, crosstalk, overshoot, and ringing. In notebook-type personal computers, it is important to minimize the power dissipation required for termination with improvement of crosstalk, overshoot, and ringing so as to extend battery life. Power dissipation is reduced to a quarter of that of shunt resistor termination and crosstalk is reduced to one half of that of series resistor termination. Furthermore, the CMOS terminating circuit can be effectively used as a damping resistor to eliminate ringing on a signal line which has a large inductance.<>