A New Impedance Control Circuit for USB2.0 Transceiver

摘要

A method of utilizing impedance control techniques using thermometer code and internal current source to create high performance USB 2.0 transceiver is described in this paper. Since digital signals are the only inputs to these new impedance control circuits, on-chip dc power dissipation can be reduced, the circuit can be made more robust, and the impedance of the circuit can be adjusted by manipulating the input digital information.