Transformer filter arrangement

Patent metadata

Field	Value
Publication number	US-9509273-B2
Application number	US-201214233497-A
Country	US
Kind code	B2
Filing date	Jun 28, 2012
Priority date	Jul 21, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A transformer filter arrangement including a transformer having a first winding and a second winding is provided. Both of the first and the second windings are located between an outer border and an inner border, which is inside the outer border. The transformer filter arrangement further includes at least one reactive sub circuit, each including at least one inductor. The first winding of the transformer is divided into a plurality of winding segments. At least a first one of the at least one reactive sub circuit being connected in series with the winding segments of the first winding between two such winding segments, and having at least one of the at least one inductor located inside said inner border.

First claim

The invention claimed is:

1. A radio communication apparatus comprising at least one transformer filter arrangement, each transformer filter arrangement including:
a transformer having a first winding and a second winding formed by conducting and isolation layers of one of a chip and printed circuit board, winding loops of both the first and the second windings, when considered in a plane of the first winding and the second winding of the transformer, enclose an area of the one of said chip and printed circuit board; and
at least one reactive sub circuit, each comprising at least one inductor;
the first winding of the transformer is divided into a plurality of winding segments;
each of the at least one reactive sub circuit:
being connected in series with the winding segments of the first winding between two such winding segments; and
having at least one of the at least one inductor located in said area; and the transformer and the at least one reactive sub circuit being tuned such that the transformer filter arrangement is configured to pass signals at a fundamental frequency and to suppress signals at least at one interfering frequency.

2. The radio communication apparatus of claim 1 , wherein the at least one transformer is part of at least one of an integrated circuit, radio receiver circuit and radio transmitter circuit.

3. The radio communication apparatus of claim 2 , wherein the radio communication apparatus is one of a wireless data modem, a mobile telephone and a radio base station.

4. A transformer filter arrangement, comprising:
a transformer having a first winding and a second winding formed by conducting and isolation layers of one of a chip and printed circuit board, winding loops of both the first and the second windings, when considered in a plane of the first winding and the second winding of the transformer, enclose an area of the one of said chip and printed circuit board; and
at least one reactive sub circuit, each comprising at least one inductor;
the first winding of the transformer is divided into a plurality of winding segments;
at least a first one of the at least one reactive sub circuit:
being connected in series with the winding segments of the first winding between two such winding segments; and
having at least one of the at least one inductor located in said area; and
the transformer and the at least one reactive sub circuit being tuned such that the transformer filter arrangement is configured to pass signals at a fundamental frequency and to suppress signals at least at one interfering frequency; and
the transformer filter arrangement is a balun arrangement and the transformer is a balun transformer.

5. A radio communication apparatus comprising at least one transformer filter arrangement, each transformer filter arrangement including:
a transformer having a first winding and a second winding formed by conducting and isolation layers of one of a chip and printed circuit board, winding loops of both the first and the second windings, when considered in a plane of the first winding and the second winding of the transformer, enclose an area of the one of said chip and printed circuit board; and
at least one reactive sub circuit including at least a first one reactive sub circuit and at least a second one reactive sub circuit, each comprising at least one inductor;
the first winding of the transformer is divided into a first plurality of winding segments;
the at least the first one of the at least one reactive sub circuit and the at least the second one of the at least one reactive sub circuit:
being connected in series with the winding segments of the first winding between two such winding segments; and
having at least one of the at least one inductor located in said area; and the transformer and the at least one reactive sub circuit being tuned such that the transformer filter arrangement is configured to pass signals at a fundamental frequency and to suppress signals at least at one interfering frequency;
the second winding of the transformer is divided into a second plurality of winding segments;
at least a third one of the at least one reactive sub circuit:
being connected in series with the winding segments of the second winding between two such winding segments; and
having another of the at least one inductor located in said area.

6. A transformer filter arrangement, comprising:
a transformer having a first winding and a second winding formed by conducting and isolation layers of one of a chip and printed circuit board, winding loops of both the first and the second windings, when considered in a plane of the first winding and the second winding of the transformer, enclose an area of the one of said chip and printed circuit board; and
at least one reactive sub circuit including at least a first one reactive sub circuit and at least a second one reactive sub circuit, each comprising at least one inductor;
the first winding of the transformer is divided into a first plurality of winding segments;
the at least the first one of the at least one reactive sub circuit and the at least the second one of the at least one reactive sub circuit:
being connected in series with the winding segments of the first winding between two such winding segments; and
having at least one of the at least one inductor located in said area; and
the transformer and the at least one reactive sub circuit being tuned such that the transformer filter arrangement is configured to pass signals at a fundamental frequency and to suppress signals at least at one interfering frequency;
the second winding of the transformer is divided into a second plurality of winding segments;
at least a third one of the at least one reactive sub circuit:
being connected in series with the winding segments of the second winding between two such winding segments; and
having another of the at least one inductor located in said area.

7. A radio communication apparatus comprising at least one transformer filter arrangement, each transformer filter arrangement including:
a transformer having a first winding and a second winding formed by conducting and isolation layers of one of a chip and printed circuit board, winding loops of both the first and the second windings, when considered in a plane of the first winding and the second winding of the transformer, enclose an area of the one of said chip and printed circuit board; and
at least one reactive sub circuit, each comprising at least one inductor;
the first winding of the transformer is divided into a plurality of winding segments;
at least a first one of the at least one reactive sub circuit:
being connected in series with the winding segments of the first winding between two such winding segments; and
having at least one of the at least one inductor located in said area; and
the transformer and the at least one reactive sub circuit being tuned such that the transformer filter arrangement is configured to pass signals at a fundamental frequency and to suppress signals at least at one interfering frequency; and
said at least one interfering frequency includes at least one harmonic of the fundamental frequency.

8. A transformer filter arrangement, comprising:
a transformer having a first winding and a second winding formed by conducting and isolation layers of one of a chip and printed circuit board, winding loops of both the first and the second windings, when considered in a plane of the first winding and the second winding of the transformer, enclose an area of the one of said chip and printed circuit board; and
at least one reactive sub circuit, each comprising at least one inductor;
the first winding of the transformer is divided into a plurality of winding segments;

Assignees

• Andersson Stefan
• Mu Fenghao
• Wernehag Johan
• ERICSSON TELEFON AB L M (publ)

Inventors

• Andersson Stefan
• Mu Fenghao
• Wernehag Johan

Classifications

• H01P1/212

  suppressing or attenuating harmonic frequencies (H01P1/215 takes precedence) · CPC title

• H03H7/0115

  comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence) · CPC title

• H03H7/427

  Common-mode filters (H02J3/01 and H02M1/126 takes precedence) · CPC title

• H03H7/1791

  Combined LC in shunt or branch path · CPC title

• H03H7/425

  Balance-balance networks · CPC title