US 11,984,866 B2
Frequency selective attenuator for optimized radio frequency coexistence
Vitor Pereira, Austin, TX (US); Jeffrey A. Tindle, Austin, TX (US); Mustafa H. Koroglu, Austin, TX (US); and Terry Lee Dickey, Pflugerville, TX (US)
Assigned to Silicon Laboratories Inc., Austin, TX (US)
Filed by Silicon Laboratories Inc., Austin, TX (US)
Filed on Aug. 22, 2022, as Appl. No. 17/892,492.
Application 17/892,492 is a continuation of application No. 16/706,433, filed on Dec. 6, 2019, granted, now 11,463,064.
Prior Publication US 2022/0399869 A1, Dec. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H03H 7/01 (2006.01); H04B 1/04 (2006.01); H04B 1/10 (2006.01); H04B 1/18 (2006.01); H04B 1/40 (2015.01); H04W 4/00 (2018.01)
CPC H03H 7/0115 (2013.01) [H03H 7/0153 (2013.01); H04B 1/0458 (2013.01); H04B 1/18 (2013.01); H04B 1/40 (2013.01); H03H 2007/013 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A wireless transceiver, comprising:
a receiver circuit coupled to a radio frequency transceiver node;
a tunable notch filter coupled between the radio frequency transceiver node and a reference node, wherein the tunable notch filter comprises a digitally programmable capacitor;
a memory programmed with a plurality of digital values, wherein the plurality of digital values are predetermined during a procedure performed by the wireless transceiver based on at least one blocker signal; and
a controller that programs the digitally programmable capacitor of the tunable notch filter with a digital value selected from the memory based on a blocker frequency signal and that selectively enables the tunable notch filter based on a receive state of the wireless transceiver and a gain control state of the receiver circuit to attenuate the at least one blocker signal.