Patent ID: 7154981
Filing Date: 2006-12-26
Classification: H03K,H04L

Abstract:
1. A termination circuit, connected to power supply and ground lines, for terminating a transmission line, comprising: a first set of resistance units, connected between the transmission line and the power supply line, each formed by connecting a first P-channel type metal oxide semiconductor (MOS) transistor and a first N-channel type MOS transistor in parallel; a second set of resistance units connected between the transmission line and the ground line, each formed by connecting a second P-channel type MOS transistor and a second N-channel type MOS transistor in parallel; a first set of control lines respectively connected to said first set of resistance units, each supplying a first signal to switch on and off said first P-channel type MOS transistor and said first N-channel type MOS transistor in a corresponding resistance unit of said first set; a second set of control lines respectively connected to said second set of resistance units, each supplying a second signal to switch on and off said second P-channel type MOS transistor and said second N-channel type MOS transistor in a corresponding resistance unit of said second set; a first set of inverters, each inverting the first signal prior to input to one of said first P-channel type MOS transistor and said first N-channel type MOS transistor in each corresponding resistance unit of said first set; and a second set of inverters, each inverting the second signal prior to input to one of said second P-channel type MOS transistor and said second N-channel type MOS transistor in each corresponding resistance unit of said second set.