Invention Grant
- Patent Title: Methods and structures to generate on/off keyed carrier signals for signal isolators
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Application No.: US14486937Application Date: 2014-09-15
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Publication No.: US09660848B2Publication Date: 2017-05-23
- Inventor: Ruida Yun , Yuanjie Sun , Baoxing Chen
- Applicant: Analog Devices Global
- Applicant Address: BM Hamilton
- Assignee: Analog Devices Global
- Current Assignee: Analog Devices Global
- Current Assignee Address: BM Hamilton
- Agency: Wolf, Greenfield & Sacks, P.C.
- Main IPC: H04L27/04
- IPC: H04L27/04 ; H03B5/12 ; H03C1/60

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.
Public/Granted literature
- US20160080181A1 METHODS AND STRUCTURES TO GENERATE ON/OFF KEYED CARRIER SIGNALS FOR SIGNAL ISOLATORS Public/Granted day:2016-03-17
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