US 8,076,993 B2Granted

Balun circuit and integrated circuit device

AssigneeNEC Corporation

InventorsYasuhiro Hamada, Shuya Kishimoto, Kenichi Maruhashi, Masaharu Ito, Masahiro Tanomura, Naoyuki Orihashi

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Abstract

A balun circuit comprising first through third CPW lines becoming signal I/O ports, a first differential transmission line for linking the central conductor of the second CPW line and the ground conductor of the first CPW line and for linking the ground conductor of the second CPW line and the central conductor of the first CPW line, a second differential transmission line for linking the central conductors of the first and third CPW lines and for linking the ground conductors of the first and third CPW lines, and a joint for connecting at least two ground conductors of the first through third CPW lines. The differential transmission line has a first line formed in a dielectric layer on a substrate, a second line arranged in the underlying layer, and an underlying line at a fixed potential arranged between the substrate and the second line.

Claims21

Dependent claims

A balun circuit comprising:

a first CPW line, a second CPW line and a third CPW line that become signal I/O ports;
a first differential transmission line that links a central conductor of said second CPW line and a ground conductor of said first CPW line and links a ground conductor of said second CPW line and a central conductor of said first CPW line;
a second differential transmission line that links a central conductor of said third CPW line and the central conductor of said first CPW line and links a ground conductor of said third CPW line and the ground conductor of said first CPW line;
and
a joint that connects two or more of the ground conductor of said first CPW line, the ground conductor of said second CPW line and the ground conductor of said third CPW line,
wherein said first differential transmission line and said second differential transmission line have a first line, a second line and an underlying layer connected to a fixed potential arranged between a substrate and said second line, said first line and said second line being formed in a dielectric layer on said substrate and said second line being formed at a position nearer to said substrate than said first line and being electromagnetically coupled to said first line.

3 more elements

A balun circuit comprising:

a first CPW line, a second CPW line and a third CPW line that become signal I/O ports;
a first differential transmission line that links a central conductor of said second CPW line and a central conductor of said first CPW line and links a ground conductor of said second CPW line and a ground conductor of said third CPW line;
a second differential transmission line that links a central conductor of said third CPW line and the ground conductor of said first CPW line and links the ground conductor of said third CPW line and the ground conductor of said second CPW line;
and
a joint that connects two or more of the ground conductor of said first CPW line, the ground conductor of said second CPW line and the ground conductor of said third CPW line,
wherein said first differential transmission line and said second differential transmission line have a first line, a second line and an underlying layer connected to a fixed potential arranged between a substrate and said second line, said first line and said second line being formed in a dielectric layer on said substrate and said second line being formed at a position nearer to said substrate than said first line and being electromagnetically coupled to said first line.

3 more elements

A balun circuit comprising:

a first CPW line, a second CPW line and a third CPW line that become signal I/O ports;
a first differential transmission line that links a central conductor of said second CPW line and a central conductor of said third CPW line and links a ground conductor of said second CPW line and a central conductor of said first CPW line;
a second differential transmission line that links the central conductor of said third CPW line and the central conductor of said second CPW line and links a ground conductor of said third CPW line and a ground conductor of said first CPW line;
and
a joint that connects two or more of the ground conductor of said first CPW line, the ground conductor of said second CPW line and the ground conductor of said third CPW line,
where said first differential transmission line and said second differential transmission line have a first line, a second line and an underlying layer connected to a fixed potential arranged between a substrate and said second line, said first line and said second line being formed in a dielectric layer on said substrate and said second line being formed at a position nearer to said substrate than said first line and being electromagnetically coupled to said first line.

3 more elements

Dependencies are inferred from the claim text.