Low voltage NFC programmer

jos · August 17, 2013

NFC communicators may be included within a larger device such as mobile telephones, PDAs, computers and smart cards. When used in this way, the NFC communicator must be able to transfer data to and from the larger device, and to and from any peripheral devices associated with it.

In order to fulfil this function NFC communicators normally include electrically erasable memory. This typically requires high voltages in the region of 15V in order to perform memory programme or erase operations, compared to a standard power supply voltage of 1.8V. A number of level-shifting circuits exist for this purpose, but all known circuits suffer from drawbacks.

To address this issue, Innovision Research and Technology plc has developed a low-to-high logic level shifter in which input transitions are synchronous with periodic resets of the supply voltage.

Read More at Source:http://www.electronicsweekly.com/news/design/eda-and-ip/electronics-patent-of-the-month-nfc-and-control-voltage-levels-2013-08/