US 12,463,592 B2
Active mixers with enhanced image rejection ratio (IRR)
Sherif Mahmoud Shakib Roshdy, San Diego, CA (US); Jeremy Darren Dunworth, La Jolla, CA (US); Jorge Garcia, San Diego, CA (US); and Paul Brian Sheehy, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jun. 23, 2023, as Appl. No. 18/340,796.
Prior Publication US 2024/0429867 A1, Dec. 26, 2024
Int. Cl. H03B 5/24 (2006.01); H03C 3/00 (2006.01); H03D 7/12 (2006.01)
CPC H03D 7/12 (2013.01) [H03B 5/24 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A communication system, comprising:
a passive quadrature generator connected directly to an in phase (I) mixer and a quadrature (Q) mixer;
an I LO amplitude detect circuit connected to the passive quadrature generator and connected to the I mixer, and a Q LO amplitude detect circuit connected to the passive quadrature generator and connected to the Q mixer, the I LO amplitude detect circuit configured to detect an I LO amplitude and the Q LO amplitude detect circuit configured to detect a Q LO amplitude; and
a combining and integrating circuit configured to receive the detected I LO amplitude and the detected Q LO amplitude and generate an I LO DC bias voltage to bias the I mixer and a Q LO DC bias voltage to bias the Q mixer.