Front end module with compensating duplexer

摘要

A front end module includes a duplexer and a balancing network. The duplexer includes a compensation circuit and a transformer three windings having five nodes. The first node for operably coupling an antenna to the first winding; the second node operable to receive an outbound wireless signal and operably couples the first winding to the second winding; the third node operably couples the second winding to a balancing network; the fourth node operably coupled to output a first signal component corresponding to an inbound wireless signal from the third winding; and the fifth node operably coupled to output a second signal component corresponding to an inbound wireless signal from the third winding. The duplexer provides electrical isolation between the first and second signal components and the outbound wireless signal. The compensation module is operable to compensate the electrical isolation between the first and second signals and the outbound wireless signal.

主权项

1. A front end module comprises:
a duplexer including:
a first winding;a second winding, wherein the first and second windings are formed on a first thick metal layer of a substrate;a third winding formed on at least a second thick metal layer of a substrate, wherein the first and second windings have an approximate ninety degree rotation with respect to the third winding;first through fifth nodes, wherein:
the first node for operably coupling an antenna to the first winding;the second node operable to receive an outbound wireless signal and operably couples the first winding to the second winding;the third node operably couples the second winding to a balancing network;the fourth node operably coupled to output a first signal component corresponding to an inbound wireless signal from the third winding; andthe fifth node operably coupled to output a second signal component corresponding to an inbound wireless signal from the third winding, wherein the first and second signal components are electrically isolated from the outbound wireless signal; anda compensation module operably coupled to at least one of the first, second, and third windings and operable to compensate the electrical isolation between the first and second signals and the outbound wireless signal; and a balancing network operable to establish an impedance that substantially matches an impedance of the antenna.