Methods and structures to generate on/off keyed carrier signals for signal isolators
US9660848B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2014 |
| Grant date | May 23, 2017 |
| Priority date | — |
| Expiry date | Sep 15, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2224/48137
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.