ES2644019T3 - Mesh made of wire rings and mesh making method made of wire rings - Google Patents

Abstract

A tunable inductor arrangement, which can be arranged on a chip or a substrate, the tunable inductor comprising a first winding part (W1) connected at one end to a first input (INP) of the tunable inductor arrangement; a second winding part (W2) connected at one end to the other end of the first winding part (W1); a third winding part (W3) connected at one end to a second input (INN) of the tunable inductor arrangement; a fourth winding part (W4) connected at one end to the other end of the third winding part (W3); in which the first, second, third and fourth winding parts (W1-W4) are interleaved in chip or substrate, such that the magnetic fields of the windings (W1-W4) are common; and a switch arrangement arranged to tune the tunable inductor arrangement to selectively provide a circuit comprising the first and fourth winding parts (W1, W4) in parallel and the second and third winding parts (W2, W3) in parallel, with parallel couplings (W1, W4; W2, W3) connected in series between the first and second inputs (INP, INN); or a circuit comprising the first, second, fourth and third winding parts (W1-W4) in series between the first and second inputs (INP, INN).

Description

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DESCRIPTION

Arrangement, transceiver, procedure and computer program of tunable inductor Technical sector

The present invention relates, in general, to a tunable inductor arrangement, a radio frequency transceiver with a resonator having said arrangement, a method for tuning the arrangement and a computer program for tuning.

Background

As radio transceivers support more bands, bands that can span a wide range of frequencies, such as from 600 MHz to 3800 MHz, these can be implemented by a set of resonators. It is known that tuning an LC resonator (inductor-capacitor) more than one octave is difficult, which results in multiple resonators being necessary. This problem is aggravated when there is carrier aggregation, that is, the communication is carried out on several different carriers simultaneously, carriers that can be extended in any way over the wide frequency range.

LC resonators consume chip space when implemented on a chip, and are very expensive when implemented outside the chip. Therefore, there is a desire to provide more flexible resonators.

US patent application 2012/0286889 A1 discloses a reconfigurable network for a voltage controlled oscillator. The reconfigurable network comprises a series of capacitors, a series of inductors and a series of switches. Said series of capacitors, inductors and switches collectively form a resonant LC tank circuit.

WO 03/052780 A1 discloses an inductive component comprising exactly one coil, which has a total inductance with two intake contacts in the coil and a control circuit. The effective inductance of the coil can be adjusted by means of the control circuit.

WO 2007/006867 A1 discloses that the inductance of a monolithic plane inductor is distributed in smaller parts of inductor (L11, L21, L22, L12). The minor inductor parts (L11, L21, L22, L12) are arranged in a cascade configuration, such that they make the inductor function as a differential inductor device. Some of the inductor parts are arranged to be connected by shortcuts or bridges (S1) symmetrically, in relation to the common point in one or more stages, for operation in one or more upper radiofrequency bands. By means of the switchable symmetric shortcut, a controllable inductance stage can be arranged. The common mode signal is affected by the same inductance regardless of the control state.

Compendium

An objective of the invention is, at the very least, to mitigate the problem indicated above. The present invention is based on the understanding that it is necessary to tune both the capacitance and the inductance of an LC resonator to achieve the desired flexibility. Accordingly, a tunable inductor arrangement is disclosed. The inventor has also understood the requirements that it is necessary for the self-resonant frequency to be set high enough for high frequency modes, the Q factor must be high enough not to degrade the gain or increase the current consumption in a usable implementation, and the inductance ratio has to be high enough to also cover the low bands. This is achieved by a switch arrangement in the tunable inductor arrangement, which performs signal routing so that the insertion loss is reduced.

According to a first aspect, a tunable inductor arrangement that can be arranged on a chip or a substrate is disclosed. The tunable inductor comprises a first winding part connected at one end to a first input of the tunable inductor arrangement; a second winding part connected at one end to the other end of the first winding part; a third winding part connected at one end to a second input of the winding part of the tunable inductor connected at a first end to a second input of the tunable inductor arrangement; a fourth winding part connected at a first end to a second end of the third winding part; and a switch arrangement arranged to tune the tunable inductor arrangement by selectively providing any of a circuit comprising the first and fourth winding parts in parallel and the second and third winding parts in parallel, the couplings being in parallel connected in series between the first and second inputs; and a circuit comprising the first, second, fourth and third parts of series winding between the first and second inputs.

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The switch arrangement may comprise a first switch connected between a second end of the second winding part and a virtual ground; a second switch connected between the second end of the fourth winding part and the virtual ground; a third switch connected between the first end of the second winding part and the virtual ground; a fourth switch connected between the first end of the fourth winding part and the virtual ground; a fifth switch connected between the first input and a second end of the fourth winding part; and a sixth switch connected between the second input and the second end of the second winding part. The tunable inductor arrangement can then be tunable by closing the third, fourth, fifth and sixth switches and having the first and second switches open, or closing the first and second switches, and having the third, fourth, fifth and sixth open. switches

The switch arrangement may comprise a first switch connected between a second end of the second winding part and a second end of the fourth winding part; a second switch connected between the second end of the first winding part and the second end of the third winding part; a third switch connected between the first input and the second input of the fourth winding part; and a fourth switch connected between the second input and the second end of the second winding part. The tunable inductor arrangement can then be tunable by closing the second, third and fourth switches and having the first switch open, or closing the first switch and having the second, third and fourth switches open.

The first, the second, the third and the fourth winding parts may be interspersed in the chip or the substrate, such that the magnetic fields of the windings are essentially common.

The tunable inductor arrangement may comprise another winding part, where the other winding part is arranged to cancel the electromagnetic coupling with the first to fourth winding parts.

Two or more of the winding parts may be arranged in a series of conductive layers on the chip or the substrate.

The virtual mass can be a DC power source that, at AC, such as radiofrequency, acts as a mass for AC signals, or it can be a mass or a DC reference voltage node.

According to a second aspect, a radio frequency transceiver comprising a resonator is disclosed, in which the resonator comprises a tunable inductor arrangement in accordance with the first aspect, where the tunable inductor arrangement is tunable to allow the resonator to selectively work in a of a series of resonant frequencies.

According to a third aspect, a multiband radio frequency receiver is disclosed which comprises a first path of the receiver arranged to receive a radio signal in a first frequency band; a second path of the receiver arranged to receive a radio signal in a second frequency band, where the first frequency band operates at a frequency greater than the second frequency band, and each of the first and second paths of the receiver are arranged to selectively operate at a desired frequency band between a series of frequency bands; and comprises a resonator comprising a tunable inductor arrangement according to the first aspect, resonator that is arranged to be tuned for the selected frequency band.

According to a fourth aspect, a communication device comprising a radio frequency transceiver according to the second aspect or a multiband radio frequency receiver according to the third aspect is disclosed, and a processor arranged to interact with the radio frequency transceiver or with the multi-band radio frequency receiver, where the processor is arranged to control the arrangement of switches in order to select a tuning mode of the tunable inductor arrangement.

According to a fifth aspect, a method of a tunable inductor arrangement including winding parts and switches for tuning, according to the first aspect, is disclosed. The method comprises determining a tuning setting for the tunable inductor arrangement; assign switching states for respective switches for tuning adjustment; and control the switches according to the assigned switching states.

In accordance with a sixth aspect, a computer program comprising computer-executable instructions is disclosed that when executed by a programmable controller of a radio frequency transceiver or multi-band radio frequency receiver comprising a resonator comprising a tunable inductor arrangement, make that the controller carry out the procedure of the fifth aspect.

From the following detailed description, the attached dependent claims as well as the drawings, other objectives, features and advantages of the present invention will become apparent. In general, all terms used in the claims should be interpreted according to their ordinary meaning in the technical sector, unless otherwise explicitly defined herein. References to "a / an / the [element,

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device, component, medium, stage, etc.] "must be interpreted in an inclusive manner as referring to at least one case of said element, device, component, medium, stage, etc., unless explicitly stated otherwise, the steps of any procedures disclosed herein do not have to be carried out in the exact order disclosed, unless explicitly stated.

Brief description of the drawings

The foregoing, as well as other objectives, features and advantages of the present invention, will be better understood by the following illustrative and non-limiting detailed description of preferred embodiments of the present invention, referring to the attached drawings.

Figure 1 schematically shows a tunable inductor arrangement according to one embodiment.

Figure 2 shows a winding distribution of a tunable inductor arrangement, together with a schematic indication of the switch arrangement according to one embodiment.

Figure 3 shows a winding distribution of a tunable inductor arrangement, when the switches are in a first state, as shown in the corresponding scheme on the right, according to an embodiment.

Figure 4 shows a winding distribution of a tunable inductor arrangement, when the switches are in a second state, as shown in the corresponding scheme on the right, according to one embodiment.

Figure 5 shows a detail of a winding distribution of a tunable inductor arrangement, according to one embodiment.

Figure 6 schematically shows a radio front, where the tunable inductor arrangements are applicable, according to the embodiments.

Fig. 7 is a block diagram schematically showing a communication device, according to an embodiment.

Fig. 8 is a flow chart schematically showing a process of a tunable inductor arrangement, according to one embodiment.

Figure 9 schematically shows an informatic program and a processor to implement the procedure. Detailed description

Figure 1 schematically shows a tunable inductor arrangement according to one embodiment. The inductor arrangement is preferably arranged on a chip or a substrate, as will be shown below. The tunable inductor arrangement comprises a first winding part W1 connected at one end to a first INP input of the tunable inductor arrangement, a second winding part W2 connected at one end to the other end of the first winding part W1, a third winding part W3 connected at one end to a second INN end of the tunable inductor arrangement and a fourth winding part W4 connected at one end to the other end of the third winding part. A switch arrangement is arranged to tune the tunable inductor arrangement, selectively providing for this a circuit comprising the first and fourth winding parts W1, W4 in parallel and the second and third winding parts W2, W3 in parallel, and then coupling the respective parallel couplings W1, W4; W2, W3 in series between the first and second inputs INP, INN, or a circuit comprising the first, second, fourth and third winding parts W1, W2, W4, W3 in series between the first and second INP, INN. The switch arrangement comprises a first switch S1 connected between the other end of the second winding part W2 and a virtual ground VDD, a second switch S2 connected between the other end of the fourth winding part W4 and the virtual ground VDD. The virtual mass can be a DC power supply, called in this case VDD, which, to AC, such as radiofrequency, acts as a mass for AC signals, or it can be a mass or a reference voltage node of CC. If the central socket is not used, the first and second switches can be replaced by a single switch S12 that provides the same function as the first and second switches S1, S2. The switch arrangement further comprises a third switch S3 connected between the other end of the first winding part W1 and the virtual ground VDD, and a fourth switch S4 connected between the other end of the third winding part W3 and the virtual ground VDD . Similarly, when the central socket is not used, the third and fourth switches can be replaced by a single switch S34 that provides the same function as the third and fourth switches S3, S4. Thus, the tunable inductor arrangement is tunable by closing the first and second switches S1, S2 (or the single switch S12), such that a circuit is formed from the first INP input through the first winding part W1, the second winding part W2, the first closed switch S1, the second

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closed switch S2 (or the single switch S12), the fourth winding part W4 and the third winding part W3 up to the second INN input, that is, all the W1-W4 windings are coupled in series.

To ensure that all windings can operate in both modes, the switch arrangement further comprises a fifth switch S5 connected between one end of the first winding part W1 and the other end of the fourth winding part W4, and a sixth switch S6 connected between one end of the third winding part W3 and the other end of the second winding part W2. In this way, the tunable inductor arrangement can also be tuned by closing the fifth and sixth switches S5, S6 when the third and fourth switches S3, S4 are closed. In that case, a circuit is formed from the first INP input through the fifth closed switch S5, the fourth winding part W4, the fourth closed switch S4, the third closed switch S3, the second winding part W2 and the sixth switch closed S6 until the second INN input.

Thus, selectively providing a circuit comprising the first and fourth winding parts W1, W4 in parallel and the second and third winding parts W2, W3 in parallel, and then coupling the respective parallel couplings W1, W4 ; W2, W3 in series between the first and second inputs INP, INN, or a circuit comprising the first, second, fourth and third winding parts W1, W2, W4, W3 in series between the first and second INP, INN inputs, the tunable inductor arrangement is allowed to provide different inductances, where all windings can operate in both modes.

Although the tunable inductor arrangement shown above can operate all the windings in all their operating modes, it can also be combined with additional inductor arrangements that do not. Such combinations can provide more tuning capacity. To achieve a good Q factor, all winding parts with mutual magnetic interaction are preferably in operation in all states. One or more circuits such as the one shown above can be used as constitutive blocks to achieve a tunable inductor arrangement.

Figure 2 shows a winding distribution of a tunable inductor arrangement, together with a schematic indication of the switch arrangement according to one embodiment. The circuit corresponds to those shown with reference to Figure 1, and the operation to provide different inductances is the same.

Figure 3 shows a winding distribution of a tunable inductor arrangement when the switches are in a first state, as shown in the corresponding diagram above on the right, according to one embodiment. Below on the right is the equivalent circuit drawn for a simple understanding of the result of the circuit. The circuit corresponds to one obtained by having the only switch S12 (or the first and second switches S1 and S2) of Figures 1 and 2 closed, and having the other switches S34 (or S4, S4), S5, S6 open. In this case, it can be seen that the serial coupling provides a winding that goes from the INP terminal through all the conductive tracks and ends at the INN terminal.

The windings are arranged on a substrate or chip. The substrate can also be a printed circuit board. A virtual mass node can also be applied, which will be explained below also referring to Figure 4. The virtual mass can be used, which can be a DC VDD power supply that, to AC, such as radiofrequency , acts as a mass for AC signals, or it can be a mass or a DC reference voltage node. When in the first state, switch S12 (or S1, S2) connects to the virtual ground node.

Figure 4 shows a winding distribution of a tunable inductor arrangement when the switches are in a second state, as shown in the corresponding diagram above on the right, according to one embodiment. The equivalent circuit is drawn on the bottom right, for a simple understanding of the circuit result. The circuit corresponds to that obtained by having the single switch S12 open (or the first and second switches S1 and S2) of Figures 1 and 2, and the other switches closed. In this case, it can be seen that a first parallel coupling that starts from the INP terminal provides a winding that meets a second parallel coupling at point A, which runs all the way to the INN terminal. In the coupling of point A, a virtual ground (not shown), such as a power supply, can be connected. The virtual mass can be a DC power source, which at AC, such as radiofrequency, acts as a mass for AC signals, or it can be a mass or a DC reference voltage node. When in the second state, switch S34 (or S3, S4) connects to the virtual ground node. As can be seen when considering Figures 3 and 4, the virtual mass node cannot be used as the only central socket in the distribution of the windings of Figures 3 and 4. However, for some distributions, that is, when S12 (or S1, S2) and S34 (or S3, S4) are placed in juxtaposition, which depends on the number of turns and the application of the turns in multiple metal layers, the distribution of the virtual mass node can be maintained in a area of the substrate or chip.

Figure 5 shows a detail of a winding distribution of a tunable inductor arrangement, according to one embodiment. It is possible, therefore, to obtain crossings of the conductive tracks that form the windings. Two o

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more of the winding parts may be arranged in a series of conductive layers on the chip or the substrate. In the illustrations, the tracks are arranged in juxtaposition on the substrate and the crosses using layered conductors. However, the tracks can also use layered conductors and be placed one above the other, or in a combination of arrangements in different layers and in juxtaposition. The shape of the windings has also been shown as an octagon, but other shapes are also possible, such as circular, square or other form of n sides, where 3 or more are worth, or combinations thereof, which form windings that enclose a magnetic field that is the objective of the windings in order to form an inductance. The inductance can be adapted in a conventional manner for differential purposes or for single termination purposes.

Figure 6 schematically shows a radio front, where the tunable inductor arrangements according to the embodiments are applicable. In a radio front circuit used, for example, in a 3GPP LTE radio, multiple bands can be used. In addition, if for example carrier aggregation where independent bands meet and use simultaneously in different communications, versatility is a key to a viable front end solution. Also, if the front should also be usable for other radio access technologies, such as GSM, UMTS, WLAN, GNSS, etc., the demands for versatility increase even more. In this way, the received signal can be in multiple frequencies and have a wide or narrow bandwidth, and for example a band selection filter, or other circuit that may require a resonator, may have to be configurable for this depending on of the current operating mode. Normally, the variable capacity in such band selection filters contributes a lot, for example using capacitor banks in which the capacity can be switched at will, but using a tunable inductor such as the one shown above, the versatility can be improved, as well as the performance of circuits that include resonators. For example, using said resonators for band selection filters in multiband receivers, the greater tuning capacity of the filters can make the band selection filter usable for any band of the multiband receiver. Using one or more tunable inductor arrangements 602, 604 as shown above, the versatility demands can be met. Flexible band combinations are thus allowed.

An example in which the front arrangement shown above can be used is a multi-band radio frequency receiver 600. The receiver 600 comprises a first path of the receiver arranged to receive a radio signal in a first frequency band and a second path of the receiver arranged to receive a radio signal in a second frequency band, where the first frequency band operates at a frequency greater than the second frequency band, ie a high-low band arrangement where both high and low bands can be received simultaneously. Each of the first and second paths of the receiver may be arranged to operate selectively at a frequency band selected from a series of frequency bands, for example, the first high band path may select to operate in one of the 1800 frequency bands MHz, 1900 MHz, 2100 MHz and 2700 MHz, while the second low band path may select to operate in one of the frequency bands of 750 MHz, 850 MHz, 900 MHz and 1500 MHz, simultaneously. These frequency bands are shown only as examples, and other frequency bands and groupings between high and low frequency bands are equally possible. Each receiver path comprises a resonator comprising a tunable inductor arrangement 602, 604 as shown above, where the resonators are arranged to be tuned for the selected frequency band in a respective receiver path. Arrangements with more than two such receiver paths are also possible. Therefore, flexible combinations of frequency bands are allowed, which, for example, is advantageous in carrier aggregation solutions, since each filter can be activated to cover any frequency within the total frequency range of the receiver 600 due to the greater viability of the filters.

Figure 6 shows an example in which the resonator is used to tune an LNA output. Of course, the resonator with tunable inductor arrangement can also be used for other purposes, such as filters, impedance matching, etc., in which a tunable inductance can be used.

Figure 7 is a block diagram schematically showing the communication device 700, according to an embodiment. The communication device comprises a receiver or transceiver 702, which may be connected to an antenna 704, and other circuits 706, such as a processor arranged in interaction with the receiver or transceiver 702, input and output interfaces of the communication device 700, etc. The receiver or transceiver 702 comprises a resonator 710, wherein the resonator comprises one or more arrangements of tunable inductor, according to any of the claims shown above. The tunable inductor arrangement can be tuned to allow resonator 710 to operate at a series of resonant frequencies. The receiver or transceiver may also comprise a controller 708 that may be arranged to control the tuning of the resonator 710, that is, also the disposable inductor arrangement. The receiver 702 may be, for example, the multi-band radio frequency receiver 600 shown with reference to Figure 6.

Fig. 8 is a flow chart schematically showing a method of a tunable inductor arrangement according to an embodiment. The method comprises determining 801 a tuning setting for the

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Tunable inductor arrangement. This can be done by receiving a frequency assignment from a remote entity or from an entity within a communication apparatus having the disposable inductor arrangement. On the basis, for example, 802 switching states are assigned to the frequency assignment information for the respective switch or switches for tuning adjustment, and 803 switches are controlled according to the assigned switching states. After a new assignment, the procedure can be repeated.

The method according to the present invention is suitable for implementation with the help of processing means, such as computers and / or processors, especially in the case where a digital controller controls the transceiver. Therefore, computer programs are disclosed, comprising instructions arranged to make the processing means, the processor or the computer carry out the steps of any of the procedures according to any of the embodiments described with reference to Figure 8. The computer programs preferably comprise program code that is stored in a computer-readable medium 900, as shown in Figure 9, which can be loaded and executed by a processing means, a processor or a computer 902 to cause this carries out the procedures, respectively, according to the embodiments of the present invention, preferably according to any of the described embodiments referring to Figure 8. Computer 902 and computer program product 900 may be arranged to execute the program code sequentially, where the actions of any of the procedures are carried out Step by Step. The processing means, the processor or the computer 1002 are preferably what is normally called an integrated system. Therefore, it should be interpreted that the computer readable medium 900 and the computer 902 depicted in Figure 9 are for illustrative purposes only to provide a compression of the essential, and are not a direct illustration of the elements.

The invention has been described primarily in the foregoing with reference to a few embodiments. However, as one skilled in the art would readily appreciate, other embodiments than those disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims.

Claims (11)

5 10 fifteen twenty 25 30 35 40 Four. Five fifty 55 60 65 1. A tunable inductor arrangement, which can be arranged on a chip or a substrate, the tunable inductor comprising a first winding part (W1) connected at one end to a first input (INP) of the tunable inductor arrangement; a second winding part (W2) connected at one end to the other end of the first winding part (W1); a third winding part (W3) connected at one end to a second input (INN) of the tunable inductor arrangement; a fourth winding part (W4) connected at one end to the other end of the third winding part (W3); in which the first, second, third and fourth winding parts (W1-W4) are interleaved in chip or substrate, such that the magnetic fields of the windings (W1-W4) are common; Y a switch arrangement arranged to tune the tunable inductor arrangement to selectively provide a circuit comprising the first and fourth winding parts (W1, W4) in parallel and the second and third winding parts (W2, W3) in parallel, with the parallel couplings (W1, W4; W2, W3) connected in series between the first and second inputs (INP, INN); or a circuit comprising the first, second, fourth and third winding parts (W1-W4) in series between the first and second inputs (INP, INN). 2. The tunable inductor arrangement according to claim 1, wherein the switch arrangement comprises a first switch (S1) connected between the other end of the second winding part (W2) and a virtual ground (VDD); a second switch (S2) connected between the other end of the fourth winding part (W4) and the virtual ground (VDD); a third switch (S3) connected between the other end of the first winding part (W1) and the virtual ground (VDD); a fourth switch (S4) connected between the other end of the third winding part (W3) and the virtual ground (VDD); a fifth switch (S5) connected between the first input (INP) and the other end of the fourth winding part (W4); Y a sixth switch (S6) connected between the second input (INN) and the other end of the second winding part (W2), wherein the tunable inductor arrangement is tunable by closing the third, fourth, fifth and sixth switches (S3-S6) and having the first and second switches open (S1, S2), or by closing the first and second switches (S1, S2) and having the third, fourth, fifth and sixth switches open (S3-S6). 3. The tunable inductor arrangement according to claim 1, wherein the switch arrangement comprises a first switch (S12) connected between the other end of the second winding part (W2) and the other end of the fourth winding part (W4); a second switch (S34) connected between the other end of the first winding part (W1) and the other end of the third winding part (W3); a third switch (S5) connected between the first input (INP) and the other end of the fourth winding part; Y 5 10 fifteen twenty 25 30 35 40 Four. Five fifty 55 60 a fourth switch (S6) connected between the second input (INN) and the other end of the second winding part, wherein the tunable inductor arrangement is tunable by closing the second, third and fourth switches (S34, S5, S6) and having the first switch open (S12), or closing the first switch (S12) and having the second, third and fourth switches (S34, S5, S6). 4. The tunable inductor arrangement according to any one of claims 1 to 3, which comprises another winding part, wherein another winding part is arranged to cancel the electromagnetic coupling with the first to fourth winding parts. 5. The tunable inductor arrangement according to any one of claims 1 to 4, wherein two or more winding parts are arranged in a series of conductive layers on the chip or the substrate. 6. A radio frequency transceiver (702) comprising a resonator (710), wherein the resonator (710) comprises a tunable inductor arrangement according to any one of claims 1 to 5, wherein the tunable inductor arrangement is tunable to allow that the resonator (710) operates selectively on one of a series of resonant frequencies. 7. A multi-band radio frequency receiver (600) comprising a first path of the receiver arranged to receive a radio signal in a first frequency band; a second path of the receiver arranged to receive a radio signal in a second frequency band, in which the first frequency band operates at a frequency greater than the second frequency band, and each the first and second paths of the receiver it is arranged to operate selectively at a selected frequency band, from among a series of frequency bands; Y it comprises a resonator comprising a tunable inductor arrangement (602, 604) according to any one of claims 1 to 5, a resonator that is arranged to be tuned to the selected frequency band. A communication device (700) comprising a radio frequency transceiver (702) according to claim 6 or a multi-band radio frequency receiver (702) according to claim 7, and a processor (708) arranged to interact with the radio frequency transceiver or the multi-band radio frequency receiver (702), in which the processor (708) is arranged to control the arrangement of switches in order to select a tuning mode of the tunable inductor arrangement. 9. A method for tuning into a tunable inductor arrangement that includes winding parts and switches, according to any one of claims 1 to 5, the method comprising determine (801) a tuning setting for the tunable inductor arrangement; assign (802) switching states to the respective switches for tuning adjustment; Y control (803) the switches according to the assigned switching states. 10. A method according to claim 9, wherein a computer program comprises computer-executable instructions which, when executed by a programmable controller (708, 902) of a radio frequency transceiver (702) or multi-band radio frequency receiver (600) comprising a resonator (710) comprising a tunable inductor arrangement, cause the controller (708, 902) to carry out the procedure. 11. A computer program product comprising a computer-readable medium containing a computer program comprising program instructions, the computer program being able to be loaded into a data processing unit and being adapted to cause the execution of the method according to claim 9 when the computer program is executed by the data processing unit.