Abstract: An RFID IC may operate at a relatively low clock frequency while impedance matching to an antenna is being tuned to increase the amount of power that the IC can extract from an incident RF wave. A tuning circuit tunes the impedance matching by adjusting a variable impedance coupling the IC and the antenna. The IC may power-up with a low clock frequency or reduce its current clock frequency to a lower clock frequency prior to tuning or during the tuning process, and may increase its clock frequency upon completion of tuning or during the tuning process.
Type:
Grant
Filed:
August 6, 2015
Date of Patent:
June 19, 2018
Assignee:
Impinj, Inc.
Inventors:
John D. Hyde, Shailendra Srinivas, Jay Kuhn, Ronald A Oliver, Harley Heinrich, Theron Stanford, Christopher J. Diorio