公开(公告)号：US20170310306A1

公开(公告)日：2017-10-26

申请号：US15493495

申请日：2017-04-21

Applicant: LINEAR TECHNOLOGY CORPORATION

Inventor： Steven TANGHE ,  Ciaran J. BRENNAN

IPC: H03H11/30 ,  H03K17/689 ,  H02M3/07 ,  H03K19/0175 ,  H01L27/02

CPC classification number: H03H11/30 ,  H01L27/0251 ,  H02M3/07 ,  H03K17/689 ,  H03K19/017509

Abstract: Multiple termination impedance values are provided in a switchable termination circuit so as to accommodate multiple transmission line characteristics. In one example, a termination matching circuit includes first and second nodes, a series interconnection of a first switch and a first impedance coupled between the first and second nodes, and another series interconnection of a second switch and a second impedance coupled between the first and second nodes. First and second control circuits respectively control the first and second switches such that a selectable impedance is provided between the first and second nodes through selective activation of the first and second switch devices by the first and second control circuits. In another example, additional nodes and resistors are provided to provide further termination impedance values.