US 12,218,702 B2
Providing a single filter for transmit and receive modes
Thomas Edward Voor, Cedar Park, TX (US); Jeffrey L Sonntag, Austin, TX (US); and Luigi Panseri, Austin, TX (US)
Assigned to Silicon Laboratories Inc., Austin, TX (US)
Filed by Silicon Laboratories Inc., Austin, TX (US)
Filed on Jun. 28, 2022, as Appl. No. 17/851,534.
Prior Publication US 2024/0063841 A1, Feb. 22, 2024
Int. Cl. H04B 1/44 (2006.01)
CPC H04B 1/44 (2013.01) 19 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a first integrated circuit (IC) having a transceiver including a transmit path and a receive path, the first IC comprising:
the transmit path to receive, process and output a transmit radio frequency (RF) signal, the transmit path comprising a first power amplifier;
the receive path to receive, process and output a receive RF signal, the receive path comprising a first low noise amplifier (LNA), the first LNA separate from the first power amplifier; and
switching circuitry coupled to the transmit path and the receive path, wherein:
in a transmit mode, the switching circuitry is to cause a RF filter to couple into the transmit path to filter the transmit RF signal and cause the filtered transmit RF signal to be provided to the first power amplifier and thereafter to an antenna, the RF filter comprising a surface acoustic wave (SAW) filter, the SAW filter external to the first IC and coupled to the first IC via a first conductive element and a second conductive element; and
in a receive mode, the switching circuitry is to cause the receive RF signal to be provided to the RF filter and the first LNA, and thereafter to be provided to a digital processor.