US 2002/0027477 A1Published application

Microwave amplifying circuit, microwave amplifying device, and distortion compensation circuit

OwnerNobuhiro Kuwata, Kenji Kotani +3inventors

InventorsNobuhiro Kuwata, Kenji Kotani, Mikiharu Oooka, Ken-ichiro Matsuzaki, Hiroaki Sano

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Abstract

A microwave amplifying circuit 1 has transistors 6, 8, and 10 and circuit sections 12, 14, 16, and 18. The circuit section 14 has one terminal electrically connected to a first current terminal of the transistor 6 and another terminal electrically connected to a control terminal of the transistor. The microwave amplifying circuit includes an impedance part 20a for supplying variable impedance between the terminals. The circuit section 16 has one terminal electrically connected to a first current terminal of the transistor 8 and another terminal electrically connected to a control terminal of the transistor 10. The circuit section 16 includes an impedance part 20b for providing variable impedance between the terminals.

Claims10

Dependent claims

A microwave amplifying circuit comprising:

a circuit input terminal;
a circuit output terminal;
first, second, and third amplifying stages, each of which has a stage input terminal and a stage output terminal, amplifies a signal received by the stage input terminal, and supplies the amplified signal to the stage output terminal;
a first capacitor which is interposed between the stage output terminal of the first amplifying stage and the stage input terminal of the second amplifying stage and which enables adjustment of capacitance;
and
a second capacitor which is interposed between the stage output terminal of the second amplifying stage and the stage input terminal of the third amplifying stage and which enables adjustment of capacitance,
wherein the first amplifying stage has an amplifying section including a first transistor, the first transistor having first and second current terminals and a control terminal, and a first circuit part which is interposed between the control terminal of the first transistor and the stage input terminal and which defines input impedance, in which the first amplifying stage receives a signal output from the circuit input terminal at the control terminal of the first transistor by way of the stage input terminal and supplies to the stage output terminal a signal output from the first current terminal of the first transistor;
the second amplifying stage has an amplifying section including a second transistor, the second transistor having first and second current terminals and a control terminal, in which the amplifying section receives a signal output from the stage input terminal at the control terminal of the second transistor and supplies to the stage output terminal a signal output from the first current terminal of the second transistor;
and
the third amplifying stage has an amplifying section including a third transistor, the third transistor having first and second current terminals and a control terminal, and a second circuit part which is interposed between the first current terminal of the third transistor and the stage output terminal and which defines output impedance, in which the amplifying section receives a signal output from the stage input terminal at the control terminal of the third transistor and, by way of the stage output terminal, supplies to the circuit output terminal a signal output from the first current terminal of the third transistor.

7 more elements

A microwave amplifying device comprising:

a plurality of terminals;
a circuit board having a microwave amplifying circuit mounted thereon;
and
an electromagnetic shield member covering the microwave amplifying circuit, the microwave amplifying circuit having:
a circuit input terminal connected to one of the plurality of terminals;
a circuit output terminal connected to one of the plurality of terminals;
first, second, and third amplifying stages interposed between the circuit input terminal and the circuit output terminal, each of which has a stage input terminal and a stage output terminal;
a first capacitor which is interposed between the stage output terminal of the first amplifying stage and the stage input terminal of the second amplifying stage and which enables adjustment of capacitance;
and
a second capacitor which is interposed between the stage output terminal of the second amplifying stage and the stage input terminal of the third amplifying stage and which enables adjustment of capacitance,
wherein the first amplifying stage has an amplifying section including a first transistor, the first transistor having first and second current terminals and a control terminal, and a first circuit part which is interposed between the control terminal of the first transistor and the stage input terminal and which defines input impedance, in which the first amplifying stage receives a signal output from the circuit input terminal at the control terminal of the first transistor and supplies to the stage output terminal a signal output from the first current terminal of the first transistor;
the second amplifying stage has an amplifying section including a second transistor, the second transistor having first and second current terminals and a control terminal, in which the amplifying section receives a signal output from the stage input terminal at the control terminal of the second transistor and supplies to the stage output terminal a signal output from the first current terminal of the second transistor;
and
the third amplifying stage has an amplifying section including a third transistor, the third transistor having first and second current terminals and a control terminal, and a second circuit part. which is interposed between the first current terminal of the third transistor and the stage output terminal and which defines output impedance, in which the amplifying section receives a signal output from the stage input terminal at the control terminal of the third transistor and supplies to the circuit output terminal a signal output from the first current terminal of the third transistor.

11 more elements

Dependencies are inferred from the claim text.