Systems and methods for drive circuits for dynamic magnetic stripe communications devices
Dynamic magnetic stripe communications devices are provided as magnetic stripe emulators. A magnetic stripe emulator may include a coil. Drive circuits may be coupled to this coil in order to produce electromagnetic fields from the coil operable to communicate with a magnetic stripe reader.
1. A device comprising:
a magnetic stripe emulator operable to communicate a magnetic stripe data track, wherein said magnetic stripe emulator comprises a coil;
a processor; and
a drive circuit coupled to said magnetic stripe emulator, wherein said drive circuit includes a first operational amplifier and a second operational amplifier.
2. The device of claim 1 , further comprising a battery.
3. The device of claim 1 , wherein said magnetic stripe emulator includes a multiple-layer, flexible printed circuit board.
4. The device of claim 1 , wherein said device includes a button.
5. The device of claim 1 , wherein said device includes a first button and a second button.
6. The device of claim 1 , further comprising an RFID.
7. A device comprising:
a magnetic stripe emulator operable to communicate a magnetic stripe data track, wherein said magnetic stripe emulator comprises a coil;
a processor; and
a drive circuit coupled to said magnetic stripe emulator, wherein said drive circuit includes:
a ramp generator operable to provide a trapezoidal signal, wherein said ramp generator comprises a capacitor and the capacitance of said capacitor is between 1,500 and 4,000 pF.
8. The device of claim 7 , wherein said ramp generator provides a ramp generator output signal and said drive circuit further comprises a signal shaping circuit operable to shape said ramp generator output signal.
9. The device of claim 7 , wherein said ramp generator provides a ramp generator output signal and said drive circuit further comprises a signal shaping circuit operable to shape said ramp generator output signal, said signal shaping circuit provides a shaped output, said drive circuit further comprises a current control circuit, said current control circuit receives said shaped signal and controls the level of current of an output.
10. The device of claim 7 , wherein said magnetic stripe emulator includes a multiple-layer flexible, printed circuit board.
11. The device of claim 7 , further comprising a battery.
12. A drive circuit operable to communicate magnetic stripe data through an inductor, comprising:
a ramp generator operable to provide a trapezoidal signal; and
a signal shaping circuit operable to smooth transition points of said trapezoidal signal to provide a smoothed signal.
13. The drive circuit of claim 12 , further comprising a current control circuit.
14. The drive circuit of claim 12 , wherein said ramp generator includes a capacitor.
15. The drive circuit of claim 12 , wherein said ramp generator includes an operational amplifier.
16. The drive circuit of claim 12 , wherein said ramp generator includes a capacitor and an operational amplifier.
17. The drive circuit of claim 12 , wherein said ramp generator includes a capacitor, a resistor, and an operational amplifier.