Power amplifier adapted to simplify adjustment work for preventing occurrence of parasitic oscillation
AssigneeFujitsu Limited
InventorTakashi Yamamoto
Life of this patent
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Abstract
A power amplifier includes a power distributor for dividing an input signal into a plurality of equally power-distributed signals; a plurality of amplifying elements for amplifying the plurality of equally power-distributed signals divided by the power distributor, respectively; a power coupler for coupling respective output signals of the plurality of amplifying elements; and a variable resistance element provided between nodes having the same phase as each other on power transmission lines in at least one side of each input side and each output side of the plurality of amplifying elements. By the constitution, it is possible to prevent occurrence of a parasitic oscillation and thus contribute to an improvement in yield as a product.
Claims23
A power amplifier comprising:
- a power distributor receiving and dividing an input signal into, and producing as outputs thereof, a plurality of equally power-distributed signals;
- a plurality of amplifying elements respectively corresponding to, and amplifying, said plurality of equally power-distributed signals output by said power distributor and producing a plurality of corresponding, amplified output signals;
- a power coupler coupling together the plurality of corresponding, amplified output signals of said plurality of amplifying elements;
- and
- a variable resistance element, comprising a trimming resistor, connected between a pair of corresponding nodes, having a common phase, of a pair of power transmission lines on one of an input side and an output side of said plurality of amplifying elements.
A power amplifier for receiving an input signal and producing an amplified signal at an output thereof, comprising:
- a power distributor for receiving and dividing the input signal into, and producing a plurality of equally power-distributed signals as outputs thereof, the power distributor supplying the equally power-distributed output signals thereof to a first plurality of corresponding power transmission lines;
- a plurality of amplifying elements having input sides respectively connected to the first plurality of power distribution lines for receiving therefrom, and amplifying, said plurality of corresponding, equally power-distributed signals and producing, and supplying to a second plurality of power transmission lines connected to output sides thereof, a plurality of corresponding, amplified output signals;
- a power coupler connected to the second plurality of power transmission lines for receiving therefrom, and coupling together, the plurality of corresponding amplified output signals and producing the coupled together, amplified output signals as the amplified signal output of the power amplifier;
- the first plurality of transmission lines having respective, first nodes of a first common phase and the second plurality of transmission lines having respective, second nodes of a second common phase;
- and
- a respective, variable resistance element associated with each pair of nodes, selectively, of one of the first plurality of nodes and of the second plurality of nodes, each variable resistance element comprising a trimming resistor connected between the respective, associated pair of nodes.
A power amplifier comprising:
- a power distributor receiving, and dividing, an input signal into a plurality of equally power-distributed signals produced as outputs thereof;
- a plurality of amplifying elements;
- a first plurality of power transmission lines corresponding to and respectively receiving, and supplying, the plurality of equally power-distributed signal outputs of the power distributor to the plurality of amplifying elements, the plurality of amplifying elements respectively amplifying the plurality of equally power-distributed signals supplied thereto and producing, respectively, a plurality of corresponding, amplified output signals;
- a second plurality of power transmission lines respectively connected to the plurality of amplifying elements and receiving the plurality of corresponding amplified output signals thereof;
- a power coupler coupled to the second plurality of power transmission lines and receiving therefrom the plurality of corresponding amplified output signals;
- a plurality of nodes comprising at least a pair of first and second nodes respectively in corresponding first and second power transmission lines of a selected one of the first and second pluralities of power transmission lines;
- and
- a respective element connected to, and providing a bidirectional conducting path between, each pair of corresponding first and second nodes, each element comprising a selected one of a first circuit element, comprising a balancing resistor, and a second circuit element, comprising a series-connected combination of a balancing resistor and a phase delay element.
Dependencies are inferred from the claim text.