US 12,255,700 B2
Dynamic BBA gain for near-field radio frequency signal processing
Mark Feichtinger, Graz (AT); Johannes Stahl, Graz (AT); Ulrich Andreas Muehlmann, Graz (AT); and Markus Wobak, Graz (AT)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Oct. 26, 2022, as Appl. No. 17/974,247.
Prior Publication US 2024/0146357 A1, May 2, 2024
Int. Cl. H04B 5/00 (2024.01); H04B 5/70 (2024.01)
CPC H04B 5/70 (2024.01) 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a communication unit configured to broadcast a radio frequency polling signal;
a signal processing unit including:
an antenna configured to receive a radio frequency signal as a received radio frequency signal,
a baseband amplifier coupled to the antenna, the baseband amplifier being configured to amplify the received radio frequency signal and output an amplified radio frequency signal that corresponds to the received radio frequency signal,
an analog-to-digital converter configured to receive the amplified radio frequency signal and generate an output digital value that corresponds to a magnitude of the amplified radio frequency signal, and
a baseband amplifier controller configured to modify an amplification gain of the baseband amplifier; and
a processor configured to:
cause the baseband amplifier controller to set the amplification gain of the baseband amplifier to a first gain value,
determine a predetermined number of sample values,
periodically record, at a sample rate, the output digital value from the analog-to-digital converter to generate a first plurality of sample values, wherein the first plurality of sample values includes a number of sample values equal to the predetermined number of sample values,
after generating the first plurality of sample values, cause the baseband amplifier controller to set the amplification gain of the baseband amplifier to a second gain value,
periodically record, at the sample rate, the output digital value from the analog-to-digital converter to generate a second plurality of sample values, and
transmit the first plurality of sample values and the second plurality of sample values to a classifier module to determine whether the radio frequency signal is received from a near-field communication-enabled device in response to the radio frequency polling signal.