Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
2007-09-28
2010-12-07
Dao, Minh D (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
C455S078000, C455S082000, C455S248100, C343S861000
Reexamination Certificate
active
07848713
ABSTRACT:
Techniques for attenuating undesired signal components from a differential duplexer are described. The duplexer provides a differential received signal at RX+ and RX− ports. This differential received signal includes an undesired common mode signal, which may come from a transmit signal. The common mode signal is attenuated with a common mode trap in an impedance matching network coupled to the RX+ and RX− ports. The matching network includes a first passive circuit coupled between the RX+ port and a first node, a second passive circuit coupled between the RX− port and a second node, and the common mode trap coupled between the first and second nodes. In one design, the common mode trap includes a first inductor coupled between the first node and a common node, a second inductor coupled between the second node and the common node, and a capacitor coupled between the common node and circuit ground.
REFERENCES:
patent: 6721544 (2004-04-01), Franca-Neto
patent: 7245883 (2007-07-01), Nakatani et al.
patent: 2004/0192230 (2004-09-01), Franca-Neto
patent: 2007/0243833 (2007-10-01), Nakatani et al.
patent: 2010/0029323 (2010-02-01), Tasic et al.
Cabanillas Jose
Gudem Prasad S.
Kwok Sai Chong
Love David
Dao Minh D
QUALCOMM Incorporated
Xu Jiayu
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