US Patent No. 10,893,492

NEAR FIELD COMMUNICATION READER WITH DYNAMIC POWER CONTROL


Patent No. 10,893,492
Issue Date January 12, 2021
Title Near Field Communication Reader With Dynamic Power Control
Inventorship Haiyu Huang, Dallas, TX (US)
Cheng-Hsien Hung, Allen, TX (US)
Assignee Maxim Integrated Products, Inc., San Jose, CA (US)

Claim of US Patent No. 10,893,492

1. A near field communication reader with dynamic power control comprising:a receiver having a receiving port, a field detector, and a RX control port;
a transmitter having a transmitting port, a RF driver, and a TX control port;
a matching network coupled to the receiver and to the transmitter;
a reader antenna coupled to the matching network;
a microcontroller coupled to the RX control port and the TX control port; and
a non-transitory computer readable media coupled to the microcontroller and including code segments and data executable on the microcontroller to
(a) calibrate a field detector threshold array for each loading level at each driver level;
(b) define a desired driver level for each loading level; and
(c) dynamically control the RF driver of the transmitter based upon a detected field detector level, a current loading level as determined by the field detector threshold array for the detected field detector level at a current driver level, and the desired driver level for the current loading level.