×

Voltage regulation of near field communication communicators

  • US 9,182,771 B2
  • Filed: 11/26/2009
  • Issued: 11/10/2015
  • Est. Priority Date: 11/26/2008
  • Status: Expired due to Fees
First Claim
Patent Images

1. A near field communications (NFC) enabled device, comprising:

  • a rectifier configured to rectify an output of an antenna circuit to provide a rectified output; and

    a regulator configured to regulate an output of the antenna circuit based upon the rectified output, the regulator comprising;

    an amplifier configured to determine a difference between the rectified output and a reference voltage to provide a control signal, the amplifier comprising;

    a differential transistor pair, wherein each transistor of the differential transistor pair configured to be a respective amplifier input,a first transistor and a second transistor configured to draw a bleed current,a first current mirror configured to couple the differential transistor pair to a voltage source;

    a second current mirror and a third current mirror respectively coupled to the first transistor and the second transistor; and

    a voltage setter configured to combine the bleed current with the control signal; and

    a plurality of voltage controlled impedances configured to regulate the output of the antenna circuit based upon an output of the voltage setter, wherein;

    the bleed current causes the plurality of voltage controlled impedances to be active; and

    each of the plurality of voltage controlled impedances couples a respective output of an antenna circuit to ground.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×