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US 2010/0148869 A1Published application
Power amplification circuit having transformer
AssigneeRenesas Technology Corp.
InventorsTsuyoshi KAWAKAMI, Akihiko Furukawa, Satoshi Yamakawa, Tetsuya Ilda, Masao Kondo, Yutaka Hoshino
Life of this patent
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Abstract
In order to realize a wider bandwidth of a frequency characteristic of a power amplification circuit, outputs of differential push-pull amplifiers which are matched at respectively different frequencies are combined together by secondary inductors, and the combined signal is outputted.
Claims10
A power amplification circuit comprising:
- a plurality of differential push-pull amplifiers coupled to a common input terminal, each coupled to an output terminal in common through a transformer for output matching, the plurality of differential push-pull amplifiers being matched at mutually different frequencies,
- wherein output signals of the plurality of differential push-pull amplifiers are combined together by a secondary inductor of the transformer.
Dependencies are inferred from the claim text.