US 7,899,410 B2Granted

Adjustable antenna interface and applications thereof

AssigneeBroadcom Corporation

InventorsVafa James Rakshani, Ahmadreza (Reza) Rofougaran, Maryam Rofougaran, Frederic Christian Marc Hayem, Claude G. Hayek, Nelson R. Sollenberger

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Abstract

An adjustable antenna interface includes a single-ended to differential conversion circuit, an adjustable impedance matching circuit, an RF differential switch, and an input. The single-ended to differential conversion circuit converts inbound RF signals from single-ended signals to differential signals and converts outbound RF signals from differential signals to single-ended signals. The adjustable impedance matching circuit provides an impedance based on an impedance control signal. The RF differential switch provides the differential outbound RF signals from the IC to the single-ended to differential conversion circuit in accordance with a first antenna control signal and provides the differential inbound RF signals from the single-ended to differential conversion circuit to the IC in accordance with a second antenna control signal. The input receives the first antenna control signal, the second antenna control signal, and the impedance control signal from the IC.

Claims14

Dependent claims

A radio comprises:

an integrated circuit (IC) that includes:
a baseband processing module coupled to:
convert outbound signal into a stream of outbound symbols;
and
convert a stream of inbound symbols into inbound signal;
a radio frequency (RF) circuit coupled to:
convert inbound RF signals into the stream of inbound symbols;
and
convert the stream of outbound symbols into outbound RF signals;
and
an adjustable antenna interface, communicatively coupled to the IC, operable to couple the at least one antenna to transmit the outbound RF signals in response to a first antenna control signal and to couple the at least one antenna to receive the inbound RF signals in response to a second antenna control signal, wherein the IC provides the first and second antenna control signals;
and wherein the adjustable antenna interface includes:
a single-ended to differential conversion circuit coupled to convert the inbound RF signals from single-ended signals to differential signals to produce differential inbound RF signals and to convert the outbound RF signals from differential signals to single-ended signals to produce single-ended outbound RF signals;
an adjustable impedance matching circuit coupled to the single-ended to differential conversion circuit, wherein the adjustable impedance matching circuit provides an impedance based on an impedance control signal provided by the IC;
an RF differential switch coupled to the single-ended to differential conversion circuit, wherein the RF differential switch provides the differential outbound RF signals from the RF circuit to the single-ended to differential conversion circuit in accordance with the first antenna control signal and provides the differential inbound RF signals from the single-ended to differential conversion circuit to the RF circuit in accordance with the second antenna control signal.

12 more elements

A cellular telephone circuit comprises:

an integrated circuit (IC) that includes:
a voice baseband processing module coupled to:
convert outbound voice signals into a stream of outbound voice symbols;
and
convert a stream of inbound voice symbols into inbound voice signals;
a data baseband processing module coupled to:
convert outbound data into a stream of outbound data symbols;
and
convert a stream of inbound data symbols into inbound data;
a radio frequency (RF) circuit coupled to:
convert inbound RF voice signals into the stream of inbound voice symbols;
convert the stream of outbound voice symbols into outbound RF voice signals;
convert inbound RF data signals into the stream of inbound data symbols;
and
convert the stream of outbound data symbols into outbound RF data signals;
and
an adjustable antenna interface, communicatively coupled to the IC, operable to couple the at least one antenna to transmit the outbound RF voice signals in response to a first antenna control signal, to couple the at least one antenna to receive the inbound RF voice signals in response to a second antenna control signal, to couple the at least one antenna to transmit the outbound RF data signals in response to a third antenna control signal, and to couple the at least one antenna to receive the inbound RF data signals in response to a fourth antenna control signal, wherein the IC provides the first, second, third, and fourth antenna control signals;
and wherein the adjustable antenna interface includes:
a single-ended to differential conversion circuit coupled to convert the inbound RF voice or data signals from single-ended signals to differential signals to produce differential inbound RF voice or data signals and to convert the outbound RF voice or data signals from differential signals to single-ended signals to produce single-ended outbound RF voice or data signals;
an adjustable impedance matching circuit coupled to the single-ended to differential conversion circuit, wherein the adjustable impedance matching circuit provides an impedance based on an impedance control signal provided by the IC;
an RF differential switch coupled to the single-ended to differential conversion circuit, wherein the RF differential switch provides the differential outbound RF voice or data signals from the RF circuit to the single-ended to differential conversion circuit in accordance with the first or third antenna control signal and provides the differential inbound RF voice or data signals from the single-ended to differential conversion circuit to the RF circuit in accordance with the second or fourth antenna control signal.

18 more elements

Dependencies are inferred from the claim text.