US Patent No. 10,893,492


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.