Patent ID: 7551000

Claim:
A differential bidirectional transceiver, connected to a first interconnection and a second interconnection, comprising: a first current transmitter, coupled to the first interconnection, wherein a node of the first current transmitter and the first interconnection has a first wire voltage signal, and the first current transmitter comprises: a first current source, having a current terminal, comprising a first internal voltage signal; a first switch, coupled to the first current source and the first interconnection, for receiving an inverting signal of an input voltage signal and controlling a current provided by the first current source to flow to the first interconnection according to the inverting signal of the input voltage signal; a second current source, having a current terminal, comprising a second internal voltage signal; and a second switch, coupled to the second current source and the first interconnection, for receiving the inverting signal of the input voltage signal and controlling a current provided by the second current source to flow from the first interconnection according to the inverting signal of the input voltage signal; a second current transmitter, coupled to the second interconnection, wherein a node of the second current transmitter and the second interconnection has a second wire voltage signal, and the second current transmitter comprises: a third current source, having a current terminal, comprising a third internal voltage signal; a third switch, coupled to the third current source and the second interconnection, for receiving the input voltage signal and controlling a current provided by the third current source to flow to the second interconnection according to the input voltage signal; a fourth current source, having a current terminal, comprising a fourth internal voltage signal; and a fourth switch, coupled to the fourth current source and the second interconnection, for receiving the input voltage signal and controlling a current provided by the fourth current source to flow from the second interconnection according to the input voltage signal; and a receiver, comprising: an input circuit, comprising: a first differential pair, for comparing the second internal voltage signal with the fourth internal voltage signal; a second differential pair, for comparing the first wire voltage signal with the second wire voltage signal; a third differential pair, for comparing the first internal voltage signal with the third internal voltage signal; and a fourth differential pair, for comparing the first wire voltage signal with the second wire voltage signal; a current summation circuit, coupled to the input circuit for summing up the output currents of the differential pairs and obtaining a small-signal output voltage signal according to the comparison result of the differential pairs; and a buffer, coupled to the current summation circuit, for adjusting the small-signal output voltage signal output from the current summation circuit.