公开(公告)号：US09692392B2

公开(公告)日：2017-06-27

申请号：US13653030

申请日：2012-10-16

Applicant: QUALCOMM Incorporated

Inventor： Jose Cabanillas ,  Aristotele Hadjichristos ,  Per O Kristensen ,  Mohan V Puntambekar

IPC: H04B1/44 ,  H03H11/34 ,  H03H7/46 ,  H04B1/04 ,  H01P1/213 ,  H03H11/30 ,  H03H7/38

CPC classification number: H03H11/344 ,  H01P1/213 ,  H03H7/465 ,  H03H11/30 ,  H03H2007/386 ,  H04B1/0458

Abstract: Techniques to implement a filter for a selected signal path by reusing a circuit component in an unselected signal path are disclosed. In an exemplary design, an apparatus includes first, second, and third circuits. The first circuit passes a first radio frequency (RF) signal to an antenna when a first signal path is selected. The second circuit passes a second RF signal to the antenna when a second signal path is selected. The third circuit is selectively coupled to the first circuit, e.g., via a switch. The first and third circuits form a filter for the second RF signal (e.g., to attenuate a harmonic of the second RF signal) when the second signal path is selected and the first signal path is unselected. The first circuit may include a series inductor, and the third circuit may include a shunt capacitor.