US 11,700,157 B2
Frequency modulation tracking for band rejection to reduce dynamic range
Alexander August Arthur Hakkola, Austin, TX (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Feb. 16, 2022, as Appl. No. 17/672,891.
Application 17/672,891 is a continuation of application No. 17/323,782, filed on May 18, 2021, granted, now 11,258,643.
Prior Publication US 2022/0376961 A1, Nov. 24, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 27/14 (2006.01); H04B 1/10 (2006.01)
CPC H04L 27/14 (2013.01) [H04B 1/10 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A tracking and rejection filter for use in a receiver of a radio, the tracking and rejection filter comprising:
a selectable filter configured to provide an output digital in-phase signal and an output digital quadrature signal based on a center frequency, a digital in-phase signal corresponding to an in-phase component of a received radio frequency signal, and a digital quadrature signal corresponding to a quadrature component of the received radio frequency signal; and
a select circuit configured to select the center frequency of the selectable filter according to whether an interfering signal is detected in a target frequency band of the received radio frequency signal, the interfering signal is a frequency modulated signal having at least a frequency equal to the center frequency, the center frequency being selected from a predetermined frequency and an estimated center frequency determined using an instantaneous frequency signal, the instantaneous frequency signal being based on the digital in-phase signal and the digital quadrature signal.