Multi-band amplifier

A multi-band amplifier circuit comprising:

• a plurality of amplifiers, each amplifier
• comprising an input, an output, and at least one amplifying stage,
• being configurable to receive an input signal within a particular frequency band, and
• forming part of a monolithic integrated circuit;
• a plurality of input impedance networks, each input impedance network being coupled to the input of a corresponding one of the plurality of amplifiers, and each input impedance network providing a predetermined input impedance within the frequency band for the corresponding amplifier, wherein at least a portion of each of the plurality of input impedance networks also forms part of the monolithic integrated circuit;
• a plurality of output impedance networks, each output impedance network being coupled to the output of a corresponding one of the plurality of amplifiers, and each output impedance network providing a predetermined output impedance within the frequency band for the corresponding amplifier;
• and
• a control circuit coupled to each of the plurality of amplifiers for selectively enabling one of the amplifiers and disabling the remaining amplifiers in response to at least one control signal.

A multi-band amplifier circuit comprising:

• a plurality of GaAs amplifiers, each GaAs amplifier
• comprising at least one amplifying stage having at least one GaAs transistor,
• being configurable to receive an input'signal within a particular frequency band, and
• forming part of a GaAs monolithic integrated circuit;
• a plurality of impedance matching networks, each impedance matching network being coupled to a corresponding one of the plurality of amplifiers, and each impedance matching network providing a predetermined impedance within the frequency band for the corresponding amplifier, wherein at least a portion of each of the plurality of impedance matching networks also forms part of the GaAs monolithic integrated circuit;
• and
• a control circuit coupled to each of the plurality of amplifiers for selectively enabling one of the amplifiers and disabling the remaining amplifiers in response to at least one control signal.

A wireless communication device including a dual-band amplifier circuit, the dual-band amplifier circuit comprising:

• a first amplifier
• comprising at least one amplifying stage,
• being configurable to receive an input signal within a first wireless communication frequency band, and
• forming part of a monolithic integrated circuit within the device;
• a first input impedance matching network coupled to the first amplifier, the first impedance matching network being configured to provide a predetermined impedance within the first frequency band;
• a second amplifier
• comprising at least one amplifying stage,
• being configurable to receive an input signal within a second wireless communication frequency band, and
• forming part of the monolithic integrated circuit;
• a second input impedance matching network coupled to the second amplifier, the second impedance matching network providing a predetermined impedance within the second frequency band, wherein the first and second impedance matching networks also form part of the monolithic integrated circuit;
• and
• a control circuit coupled to each of the plurality of amplifiers for selectively enabling one amplifier and disabling the other amplifier in response to at least one control signal.

An amplifier circuit comprising:

• an amplifier having at least one amplifying stage, the amplifier receiving an input signal in one of a plurality of frequency bands;
• a plurality of impedance matching networks each comprising at least one component, each impedance matching network corresponding to one of the plurality of frequency bands and providing a predetermined impedance within the corresponding frequency band, wherein the plurality of impedance matching networks includes a first impedance matching network and a second impedance matching network, and the first and second networks each include a common passive component, and wherein furthermore the first impedance matching network comprises a first passive component and a second passive component, the second impedance matching network comprises the first passive component, and the second passive component is bypassed by the switch when the switch couples the second impedance matching network to the amplifier;
• and
• a switch for selectively coupling a particular one of the plurality of impedance matching networks to the amplifier in response to at least one control signal.