US 12,431,922 B2
Dynamic antenna tuning apparatus and method
Noureddine Senouci, Le Landeron (CH); and Alexander Heubi, La Chaux-de-Fonds (CH)
Assigned to SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed by SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Phoenix, AZ (US)
Filed on Aug. 3, 2022, as Appl. No. 17/817,082.
Claims priority of provisional application 63/260,458, filed on Aug. 20, 2021.
Prior Publication US 2023/0060017 A1, Feb. 23, 2023
Int. Cl. H04B 1/04 (2006.01); H03F 1/02 (2006.01); H03F 3/24 (2006.01); H04B 5/72 (2024.01)
CPC H04B 1/0458 (2013.01) [H03F 1/0233 (2013.01); H03F 3/245 (2013.01); H04B 5/72 (2024.01); H03F 2200/105 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
11. A near-field transmitter for transmitting a signal using near-field communication, comprising:
a modulator having an input for receiving a communication signal, and an output for providing a differential output signal to first and second integrated circuit terminals;
a power amplifier having an input coupled to said output of said modulator, and first and second outputs adapted to be coupled to an inductor, for providing a differential output signal;
a tunable reactive element coupled between said first and second outputs of said power amplifier whose reactance is tuned by a tuning signal;
an envelope detector coupled to said output of said power amplifier for providing an envelope signal in response to said differential output signal; and
an antenna tuning circuit for adjusting said tuning signal in response to said envelope signal.