# US 2010/0167667 A1 · Setting of a balun

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- Number: US 2010/0167667 A1
- Document ID: US20100167667A1
- Status: Published application
- Kind: A1
- Application number: 12/648,165
- Filed: 2009-12-28
- Published: 2010-07-01
- Earliest claimed: 2008-12-30
- Assignees: STMicroelectronics (Tours) SAS
- Inventors: Claire Laporte; Hilal Ezzeddine
- Web page: https://patentgrep.com/patent/US20100167667A1

## CPC

- H01F 21/12: discontinuously variable, e.g. tapped
- H01F 27/42: Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H)
- H01P 5/10: for coupling balanced lines or devices with unbalanced lines or devices
- H03H 7/42: Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
- H03H 7/422: {comprising distributed impedance elements together with lumped impedance elements}
- H01F 17/0013: {with stacked layers}
- H01F 27/40: Structural association with built-in electric component, e.g. fuse
- H03H 7/1775: {Parallel LC in shunt or branch path (H03H7/1791 takes precedence)}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)

## Abstract

A balun including on the common-mode side, an inductive element in series with a first capacitive element between a first common-mode access terminal and the ground; and on the differential-mode side, two inductive windings in series having first respective ends defining differential access terminals and having second common ends connected to ground, second capacitive elements being respectively connected in parallel on the differential-mode windings.

## Claims

### Claim 1

A balun comprising:
on the common-mode side, an inductive element in series with a first capacitive element between a first common-mode access terminal and the ground, said capacitive element being connected between said inductive element and ground; and
on the differential-mode side, two inductive windings in series having first respective ends defining differential access terminals and having second common ends connected to ground, and second capacitive elements respectively connected in parallel on the differential-mode windings.

### Claim 2 (depends on 1)

The balun of claim 1, wherein the value of the first capacitive element is selected to define the impedance ratio, between common mode access and differential mode accesses at a first frequency corresponding to the central frequency of the bandwidth.

### Claim 3 (depends on 2)

The balun of claim 2, wherein the value of the second capacitive elements is selected to define an impedance on the differential mode side at a second frequency different from said first frequency.

### Claim 4 (depends on 3)

The balun of claim 3, wherein the second frequency corresponds to the frequency of an oscillator connected on the differential mode side.

### Claim 5 (depends on 1)

The balun of claim 1, wherein the inductive elements are made in the form of planar conductive windings.

### Claim 6 (depends on 1)

The balun of claim 1, wherein the conductive windings are made in the form of several interdigited windings superposed in two conductive levels.

### Claim 7 (depends on 1)

A radio transmit circuit comprising:
at least one transmit or receive path comprising at least one balun;
at least one oscillator, wherein the balun is the balun of claim 1.

### Claim 8 (depends on 7)

A transceiver device comprising at least one circuit of claim 7.