Back to results
US 8,134,408 B2Granted
Power amplification circuit having transformer
AssigneeRenesas Electronics Corporation
InventorsTsuyoshi Kawakami, Akihiko Furukawa, Satoshi Yamakawa, Tetsuya Iida, Masao Kondo, Yutaka Hoshino
Life of this patent
Estimating the term…
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.
Claims6
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, and
- wherein each of the differential push-pull amplifiers includes:
- a primary inductor provided as a part of the transformer;
- a preceding-stage amplifier operable to receive an input signal;
- a succeeding-stage amplifier operable to receive and perform an inverting amplification of an output signal of the preceding-stage amplifier to drive the primary inductor;
- and
- a feedback resistor coupled between an input and an output of the succeeding-stage amplifier.
5 more elements
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,
- wherein the input terminal is supplied with a differential signal, and
- wherein each of the differential push-pull amplifiers includes:
- a first preceding-stage amplifier operable to receive a first signal of the differential signal;
- a second preceding-stage amplifier operable to receive a second signal complementary to the first signal of the differential signal;
- a first succeeding-stage amplifier operable to perform non-inverting amplification of an output signal of the first preceding-stage amplifier;
- a second succeeding-stage amplifier operable to perform non-inverting amplification of an output signal of the second preceding-stage amplifier;
- a first feedback resistor coupled between an input of the first succeeding-stage amplifier and an output of the second preceding-stage amplifier;
- a second feedback resistor coupled between an input of the second succeeding-stage amplifier and an output of the first succeeding-stage amplifier;
- and
- a primary inductor coupled between the output of the first succeeding-stage amplifier and the output of the second succeeding-stage amplifier.
9 more elements
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,
- wherein the plurality of differential push-pull amplifiers includes first and second differential push-pull amplifiers each having a primary inductor of the transformer and being matched at mutually different frequencies, and
- wherein, in the transformer for output matching,
- the primary inductor provided for the first differential push-pull amplifier is comprised of a first loop-shaped primary inductor wiring formed in the shape of a loop,
- the primary inductor provided for the second differential push-pull amplifier is comprised of a second loop-shaped primary inductor wiring arranged on the inner side of the first loop-shaped primary inductor wiring,
- the secondary inductor is comprised of a loop-shaped secondary inductor wiring arranged between the first loop-shaped primary inductor wiring and the second loop-shaped primary inductor wiring, and
- the spacing between the first loop-shaped primary inductor wiring and the second loop-shaped primary inductor wiring is at least three times as much as a line width of each of the first and second primary inductor wirings.
5 more elements
Dependencies are inferred from the claim text.