US 2011/0299437 A1 · FRONT END MODULE WITH COMPENSATING DUPLEXER

Abstract

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.

Claims16

Dependent claims

A front end module comprises:

a duplexer including:
a first winding;
a second winding;
a 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;
and
the 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;
and
a 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.

12 more elements

A radio front end comprises:

a power amplifier operably coupled to amplify an up-converted signal to produce an outbound wireless signal;
a duplexer operably coupled to an antenna, wherein the duplexer is operable to provide electrical isolation between the outbound wireless signal and an inbound wireless signal;
a balancing network operably coupled to the duplexer and operable to establish an impedance that substantially matches an impedance of the antenna;
and
a compensation module operable to compensate for degradation of the electrical isolation between the first and second signals and the outbound wireless signal caused by parasitic capacitance of the duplexer.

2 more elements

Dependencies are inferred from the claim text.

Front end module with compensating duplexer

Life of this patent

Front end module with compensating duplexer

Life of this patent

Abstract

Claims16