Filtering a single wire protocol (SWP) current signal to be provided to a near field communications (NFC) device
US9031505B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 13, 2014 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Jan 13, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72412
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communications device is disclosed that includes a united integrated circuit card (UICC) that provides a single wire protocol (SWP) current signal to a near field communications (NFC) device. The SWP current signal is filtered by a filter to remove noise from the SWP current signal. The filter is precharged by a reference voltage when the SWP current signal is in a low state and then filters the SWP current signal when the SWP current signal is in a high state. A switching network provides the filter with the reference voltage to precharge when the SWP is current signal is in the low state and then provides the filter with the SWP current signal to filter when the SWP current signal is in the high state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.