Common mode signal attenuation for a differential duplexer

Details Common mode signal attenuation for a differential duplexer Common mode signal attenuation for a differential duplexer

H - Electricity

04

B

H04B 1/52 (2006.01)

Patent

CA 2697906

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.

L'invention porte sur des techniques pour atténuer des composantes de signal indésirable à partir d'un duplexeur différentiel. Le duplexeur fournit un signal reçu différentiel à des ports RX+ et RX-. Ce signal reçu différentiel comprend un signal en mode commun indésirable, qui peut provenir d'un signal de transmission. Le signal en mode commun est atténué avec un réjecteur de mode commun dans un réseau d'adaptation d'impédance couplé aux ports RX+ et RX-. Le réseau d'adaptation comprend un premier circuit passif couplé entre le port RX+ et un premier nud, un second circuit passif couplé entre le port RX- et un second nud, et le réjecteur de mode commun couplé entre les premier et second nuds. Dans une certaine conception, le réjecteur de mode commun comprend une première inductance couplée entre le premier nud et un nud commun, une seconde inductance couplée entre le second nud et le nud commun, et un condensateur couplé entre le nud commun et la masse du circuit.

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