Circuits and systems for low power magnetic secure transmission

Patent metadata

Field	Value
Publication number	US-10963764-B2
Application number	US-201916510498-A
Country	US
Kind code	B2
Filing date	Jul 12, 2019
Priority date	Aug 29, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.

First claim

What is claimed is:

1. A system, comprising
a driver circuit that drives a first output and a second output;
a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and
a programmable slew circuit coupled to the driver circuit,
wherein the driver circuit includes:
a first transistor that couples a first voltage to the first output in response to a first signal;
a second transistor that couples the first voltage to the second output in response to a second signal;
a third transistor that couples the first output to ground in response to a first slew signal from the programmable slew circuit; and
a fourth transistor that couples the second output to ground in response to a second slew signal from the programmable slew circuit.

2. The system of claim 1 , further including a switch coupled between the first output and the coil.

3. The system of claim 2 , wherein the switch receives the control signal and couples the first output to the coil in response to the control signal, an opposite side of the coil being coupled to the second output.

4. The system of claim 1 , wherein the first voltage is provided from a reverse boost circuit powered by a battery.

5. The system of claim 1 , further including an overvoltage protection circuit configured to protect the driver circuit.

Assignees

• Integrated Device Tech

Inventors

• Liu Rui
• Qi Tao
• Zhao Lijie
• Mehas Gustavo James
• Park Tae Kwang
• Guo Zhitong
• Fan Siqiang

Classifications

• G06K19/07779

  the inductive antenna being a coil · CPC title

• G06K19/06206 Primary

  the magnetic marking being emulated · CPC title

• G06K7/10316

  using at least one antenna particularly designed for interrogating the wireless record carriers (antennas in general H01Q1/22) · CPC title

• G06K7/084

  sensing magnetic material by relative movement detecting flux changes without altering its magnetised state · CPC title

• G06Q20/3278

  RFID or NFC payments by means of M-devices · CPC title