US 12,149,267 B2
T-switch with shunt for improved receiver sensitivity
Vahid Dabbagh Rezaei, San Diego, CA (US); Ahmed Abbas Mohamed Helmy, San Diego, CA (US); and Prakash Thoppay Egambaram, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on May 1, 2023, as Appl. No. 18/310,453.
Application 18/310,453 is a continuation of application No. 17/327,285, filed on May 21, 2021, granted, now 11,658,689.
Claims priority of provisional application 63/045,787, filed on Jun. 29, 2020.
Prior Publication US 2023/0275602 A1, Aug. 31, 2023
Int. Cl. H04B 1/00 (2006.01); H03K 3/2885 (2006.01)
CPC H04B 1/006 (2013.01) [H03K 3/2885 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A receive circuit in a wireless communication apparatus, the receive circuit comprising:
a first mixer;
a second mixer;
a first receive path coupled to the first mixer and the second mixer, the first receive path comprising:
a first low noise amplifier having an output;
a first switch having an input and an output, wherein the input of the first switch is coupled to the output of the first low noise amplifier;
a first transformer having an output and an input coupled to the output of the first switch;
a first switch circuit comprising a first T-switch, wherein the first switch further comprises an input coupled to the output of the first transformer, and an output coupled to the first mixer; and
a second switch circuit comprising a second T-switch, wherein the second switch circuit comprises an input coupled to the output of the first transformer, and an output coupled to the second mixer; and
a second receive path coupled to the second mixer, the second receive path comprising:
a second low noise amplifier having an output;
a second switch having an input and an output, wherein the input of the second switch is coupled to the output of the second low noise amplifier;
a second transformer having an output and an input coupled to the output of the second switch; and
a third switch circuit comprising a third T-switch, wherein the third switch circuit comprises an input coupled to the output of the second transformer and an output coupled to the first mixer.