Patent ID: 7208972
Filing Date: 2007-04-24
Classification: H04L

Abstract:
1. A circuit for signaling between a first integrated circuit (IC) chip powered by a first power supply voltage and a second IC chip powered by a second power supply voltage comprising: a differential receiver in the second IC chip having a reference input and a data input coupled to a data output of a first driver in the first IC chip; a first termination network having a first terminator node coupled to the data input, the first terminator node generating a Thevenin's voltage source from the second power supply voltage; a second termination network having a second terminator node generating a Thevenin's voltage source from the second power supply, the second terminator node coupled to a positive potential of the first power supply-voltage with a source impedance in the first IC chip; a third termination network having a third terminator node generating a Thevenin's voltage source from the second power supply, the third terminator node coupled to a ground potential of the first power supply voltage source impedance in the first IC chip; and a voltage divider network having an output node coupled to the reference input of the differential receiver, a first impedance coupled between the second terminator node and the output node, and a second impedance coupled between the third terminator node and the output node.