公开(公告)号：US09660848B2

公开(公告)日：2017-05-23

申请号：US14486937

申请日：2014-09-15

Applicant: Analog Devices Global

Inventor： Ruida Yun ,  Yuanjie Sun ,  Baoxing Chen

IPC: H04L27/04 ,  H03B5/12 ,  H03C1/60

CPC classification number: H04L27/04 ,  H03B5/1215 ,  H03B5/1228 ,  H03C1/60 ,  H04L25/0286

Abstract: An oscillator for a signal isolator system includes a capacitor and an inductor connected in parallel, two pairs of cross-coupled switches and a control switch. The capacitor, the inductor and the cross-coupled switches form an oscillator. The control switch controls operation of the oscillator between an ON state and an OFF state in response to a data signal to be communicated across an isolation barrier. The inductor may be formed from a winding of an isolation transformer, which reduces component count as compared to a system that provides a separate inductor. Other embodiments may include a current-supplying kickstart circuit and a shorting transistor that can speed transition between the ON and OFF states.