Invention Grant
US08670710B2 Filtering a single wire protocol (SWP) current signal to be provided to a near field communications (NFC) device
有权
过滤要提供给近场通信（NFC）设备的单线协议（SWP）电流信号
- Patent Title: Filtering a single wire protocol (SWP) current signal to be provided to a near field communications (NFC) device
- Patent Title (中): 过滤要提供给近场通信（NFC）设备的单线协议（SWP）电流信号
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Application No.: US13260742Application Date: 2010-09-07
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Publication No.: US08670710B2Publication Date: 2014-03-11
- Inventor: David John Miles
- Applicant: David John Miles
- Applicant Address: GB Cambridge, Cambridgeshire
- Assignee: Broadcom Innovision Limited
- Current Assignee: Broadcom Innovision Limited
- Current Assignee Address: GB Cambridge, Cambridgeshire
- Agency: Sterne, Kessler, Goldstein & Fox, P.L.L.C.
- Priority: GB0915547.4 20090907
- International Application: PCT/GB2010/051491 WO 20100907
- International Announcement: WO2011/027179 WO 20110310
- Main IPC: H04B5/00
- IPC: H04B5/00
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.
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