Patent ID: 7804188
Filing Date: 2010-09-28
Classification: H04B

Abstract:
1. A termination circuit for use in a transmission line constituted by a first signal wire and a second signal wire to transmit a differential signal comprising: a first series circuit of a first resistive element and a first inductive element, one end of said first resistive element being connected to said first signal wire, the other end of said first resistive element being connected to one end of said first inductive element, the other end of said first inductive element being applied with a reference voltage; a second series circuit of a second resistive element and a second inductive element, one end of said second resistive element being connected to said second signal wire, the other end of said second resistive element being connected to one end of said second inductive element, the other end of said second inductive element being applied with said reference voltage; and a reference potential generating circuit generating, as said reference voltage, a potential equivalent to a center potential of said differential signal, wherein said reference potential generating circuit includes a voltage dividing circuit for dividing a power supply voltage to generate said reference voltage; said first and second inductive elements being magnetically coupled such that said first and second inductive elements generate magnetic fields having such directions as to reinforce each other when a common-mode signal flows along said transmission line, and generate magnetic fields having such directions as to weaken each other when a differential-mode signal flows along said transmission line.