KR20080049567A - Multi-mode local oscillating system - Google Patents

Abstract

A multi-mode local oscillating system is provided to reduce an area of an integrated chip by using oscillation signal paths sharing a voltage controlled oscillator and a feedback loop. An oscillation circuit(310) generates a local oscillation signal. A plurality of oscillation signal paths(330,340,350) are formed to provide the non-frequency-divided local oscillation signal or the frequency-divided local oscillation signal by using an RF transmitter according to each of communication standards. A feedback loop(320) controls a frequency of the local oscillation signal. The oscillation circuit includes four oscillation signals having a phase difference of 90 degrees. The feedback loop includes a pre-scaler for previously dividing the local oscillation signal and a phase-locked loop for comparing the pre-scaled local oscillation signal with the reference frequency and controlling the frequency of the local oscillation signal.

Description

Multi-mode local oscillating system

1 is a table showing frequency allocation for a multimode wireless communication system.

2 shows a local oscillation system for a conventional WLAN / WiFi / WiMAX integrated chip.

3 is a diagram illustrating a multimode local oscillator according to an embodiment of the present invention.

4 is a diagram illustrating an example of a feedback loop of FIG. 3.

5 is a diagram illustrating another example of the feedback loop of FIG. 3.

FIG. 6 is a diagram illustrating another example of the feedback loop of FIG. 3.

7 illustrates a multimode communication device according to an embodiment of the present invention.

The present invention relates to a local oscillator and, more particularly, to a multimode local oscillator.

Recently, the trend of the wireless communication system service market is moving toward integrating the existing wireless local area network (WLAN) system in the 2.4 GHz band, the portable Internet service WiMAX (WiBRO) system, and the WiFi system, which have extended functions and ranges. have.

In fact, the frequency bands of a particular communication system are allocated differently for each country, but small countries are allocating the same frequency band as countries with large markets, such as the United States or Europe.

Referring to FIG. 1, the available frequency range of WiMAX / WiBRO is expected to operate in the 2.3-2.7GHz and 3.4-3.8GHz frequency bands. In Korea, WiBro allocates a band around 2.3 GHz, and in the US, a band around 2.5 GHz, and most countries including Europe allocate a band around 3.5 GHz for wireless broadband service.

Wireless LAN service of 2.4GHz band uses ISM band (unlicensed band) of 2.4 ~ 2.483GHz band using IEEE 802.11b / g international standard, so it uses low output to reduce frequency interference with other communication services. As a result, there is a narrow coverage problem. Accordingly, the wireless LAN service of the 2.4 GHz band is limited to indoor and narrow coverage hotspots. However, the wireless LAN system can be easily interworked with the existing wired internet network. Due to the system specifications according to international standards, the service is being provided in the form of a free service by various operators due to the advantages of low device cost and high speed data transmission. It is true.

The IEEE 802.11n research groups, referred to as Wireless Fidelity 'WiFi', are currently working on modifications and extensions to the standard for a variety of purposes, especially for high-quality, dynamic frequency selection and transmission power control of video, voice, and multimedia. Is evolving a standard to combine IEEE 802.11a implementations.

The WiBRO (Portable Internet Service) of 2.3 ~ 2.39 GHz band developed in Korea has been reassigned to the mobile Internet service by recovering the conventional WLL (Wireless Local Loop) frequency band, and various types of system schemes are being considered.

Wireless adapts to WiBro / WiMAX's multiple wireless access standards for 802.11b / g in the existing 2.4 GHz band, 802.11n and 802.11a in the 5 GHz band, which is an advanced WLAN technology, and three markets including Korea, the United States, and Europe. There is an urgent need to develop next-generation wireless systems that can be accessed. In particular, it is necessary to develop a multiband multimode transceiver to meet the market and function requirements of such a wireless system, and for a multiband multimode operation, an LO signal generator capable of providing an LO signal supporting various frequency bands and modes of operation is essential. Required.

It is very difficult to design a single local oscillator that covers all the frequency bands of three communication systems. In the past, a separate local oscillator was used for each communication system.

2 shows a local oscillation system for a conventional WLAN / WiFi / WiMAX integrated chip.

The local shredded system 200 includes a first local oscillator 210 for WLAN communication, a second local oscillator 220 for WiFi, and a third local oscillator 230 for WiMAX.

Each local oscillator 210, 220, 230 includes a voltage controlled oscillator 211, 221, 231 and a feed back loop 212, 222, 232.

Each feedback loop 212, 222, 232 determines the oscillation frequency of each voltage-controlled oscillator 211, 221, 231, it may be implemented in a conventional phase locked loop (Phase Locked Loop).

The oscillation signals 213, 223, 233 generated by the voltage controlled oscillators 211, 221, 231 are used as local oscillation signals for respective communication systems.

In general, a voltage controlled oscillator or a phase locked loop takes a large area on a chip when the circuit is complicated and implemented in a single chip. Therefore, as the number of integrated communication systems increases, the integrated chip area increases. On the other hand, it is very difficult to design a voltage controlled oscillator and a phase locked loop to cover a very wide frequency band, and its characteristics are unstable even if the actual design is possible.

Therefore, even using a voltage controlled oscillator and a phase locked loop covering a relatively narrow frequency band, it is very necessary to implement a local oscillator for an integrated chip having a small chip area.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a multimode local oscillator for an integrated chip having a small chip area.

In particular, it is an object of the present invention to provide a multimode local oscillator having a small chip area for a WLAN / WiFi / WiMAX integrated chip, which is now widely used or is in use.

In addition, another object of the present invention is to provide a communication device using a local oscillator for an integrated chip.

In order to achieve the above object, the multi-mode local oscillator according to an embodiment of the present invention, the oscillation circuit for generating a local oscillation signal, by dividing the local oscillation signal with an RF transmitter according to each communication standard without division or division A plurality of oscillation signal paths to provide, and a feedback loop for controlling the frequency of the local oscillation signal.

The oscillation circuit may generate the local oscillation signal including four oscillation signals having a phase difference of 90 degrees.

The feedback loop may include a prescaler for pre-dividing the local oscillation signal, and a phase locked loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency.

The feedback loop includes a divider for dividing the local oscillation signal, a buffer for amplifying the divided local oscillation signal, a prescaler for pre-dividing the amplified local oscillation signal, and the prescaled local oscillation signal with a reference frequency. In comparison, it may include a phase locked loop for controlling the frequency of the local oscillation signal.

The phase locked loop may be a digital phase locked loop.

The feedback loop may include a divider for dividing the local oscillation signal, and a phase locked loop for controlling the frequency of the local oscillation signal by comparing the divided local oscillation signal with a reference frequency.

The oscillation signal path of at least one of the local oscillation signal paths is divided into 2/3 by dividing the local oscillation signal by 1/3, and by mixing the local oscillation signal and the oscillation signal divided by 1/3. It may include a mixer for generating a generated oscillation signal.

In order to achieve the above object, the multi-mode local oscillator according to another embodiment of the present invention is an oscillation circuit for generating a local oscillation signal of about 4.6 ~ 5.825 GHz band, of about 5.15 ~ 5.825 GHz band of the local oscillation signal WLAN signal path that provides the oscillation signal as it is, WiBRO / WiMAX signal path which generates the oscillation signal of about 2.3 to 2.7 GHz band by dividing the oscillation signal of about 4.6 to 5.4 GHz band by 1/2 of the local oscillation signal, A WiMAX signal path directed to Europe for generating oscillation signals in the about 3.43 to 3.885 GHz band by dividing the oscillating signals in the about 5.15 to 5.825 GHz band out of the local oscillation signals by two-thirds, and a feedback loop for controlling the frequencies of the local oscillating signals. It includes.

The oscillation circuit may generate the local oscillation signal including four oscillation signals having a phase difference of 90 degrees.

The feedback loop may include a prescaler for pre-dividing the local oscillation signal, and a phase locked loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency.

The feedback loop may include a frequency divider for dividing the local oscillation signal, a buffer for amplifying the divided local oscillation signal, a prescaler for pre-dividing the amplified local oscillation signal, and the prescaled local oscillation signal. And a phase locked loop for controlling the frequency of the local oscillation signal.

The phase locked loop may be a digital phase locked loop.

The feedback loop may include a divider for dividing the local oscillation signal, and a phase locked loop for controlling the frequency of the local oscillation signal by comparing the divided local oscillation signal with a reference frequency.

The WiMAX signal path for the European may include a divider for dividing the local oscillation signal by one third, and a combination of the local oscillation signal and the oscillation signal divided by one third and the local oscillation signal in a band of about 3.43 to 3.885 GHz. It may include a mixer to generate.

In order to achieve the above object, a communication apparatus according to an embodiment of the present invention includes a plurality of RF transceivers each having a different communication standard, an oscillation circuit generating a local oscillation signal, and each of the plurality of RF transceivers. And a plurality of oscillation signal paths for providing a local oscillation signal without division or by dividing, and a feedback loop for controlling the frequency of the local oscillation signal.

The feedback loop may include a prescaler for lowering the frequency of the local oscillation signal, and a digital phase fixed loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency.

In order to achieve the above object, a communication device according to another embodiment of the present invention is a WLAN transceiver according to the WLAN standard of 5GHz band, a WiBRO / WiMAX transceiver according to the WiBRO / WiMAX standard, a European WiMAX transceiver according to the European WiMAX standard An oscillation circuit for generating a local oscillation signal in the about 4.6 to 5.825 GHz band, a WLAN signal path for providing an oscillation signal in the about 5.15 to 5.825 GHz band to the WLAN transceiver and about 4.6 to the local oscillation signal WiBRO / WiMAX signal path which divides the oscillation signal of 5.4 GHz band into 1/2 to generate the oscillation signal of about 2.3-2.7 GHz band and provides the oscillation signal of about 2.3-2.7 GHz band to the WiBRO / WiMAX transceiver, European WiMAX, which generates an oscillation signal in the about 3.43 to 3.885 GHz band and divides the oscillation signal in the about 5.15 to 5.825 GHz band into two-thirds of the local oscillation signal, and provides it to the European WiMAX transceiver. A signal path, and a feedback loop for controlling the frequency of the local oscillating signal.

The feedback loop may include a prescaler for lowering the frequency of the local oscillation signal, and a digital phase fixed loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency.

With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, embodiments of the present invention may be implemented in various forms and It should not be construed as limited to the embodiments described in.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosure form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for the components.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. Like reference numerals refer to like elements for convenience of description.

3 is a diagram illustrating a multimode local oscillator according to an embodiment of the present invention. For convenience of description, the multi-mode local oscillator will be described based on providing local oscillation signals for three communication modes.

The multi-mode local oscillator 300 provides oscillation circuits 310 for generating local oscillation signals and oscillation signal paths 330, 340 that provide local oscillation signals without division or division by RF transmitters according to respective communication standards. 350 and a feedback loop 320 for controlling the frequency of the local oscillating signal.

The oscillation circuit 310 generates a quadrature local oscillation signal in the 4.6 to 5.825 GHz band. That is, the generated local oscillation signal includes four oscillation signals having a phase difference of 90 degrees. The reason for generating the quadrature local oscillation signal is due to the RF transceiver structure of the communication system. The local oscillation signal necessary for making the baseband of I +, I-, Q +, and Q- required in the direct conversion method is generated. To provide.

The first signal path 330 is used to generate a local oscillation signal 335 for an RF transmitter in accordance with the European WiMAX standard. The first signal path 330 uses a 5.15 to 5.825 GHz band among the bands that the oscillation circuit 310 can output.

The divider 331 divides the local oscillation signal of the 5.15 to 5.825 GHz band generated by the oscillation circuit 310 by 1/3 to generate an oscillation signal divided by 1/3 of the 1.72 to 1.94 GHz band.

The mixer 332 mixes the 1/3 divided oscillation signal and the local oscillation signal to generate a 2/3 divided oscillation signal in the 3.43 to 3.885 GHz band. The mixer 332 includes a single side band mixer (SSB), which is used to suppress unwanted upconversion frequency components (4/3 divided oscillation signals).

The second signal path 340 is used to generate a local oscillation signal 345 for an RF transmitter in accordance with the WiBRO / WiMAX specification. The second signal path 340 uses a band of 4.6 to 5.4 GHz among bands that the oscillation circuit 310 can output.

The buffer 341 amplifies the local oscillation signal in the band of 4.6 to 5.4 GHz, and the divider 342 divides the local oscillation signal in the band of the amplified 4.6 to 5.4 GHz by half. On the other hand, half-divided oscillating signals in the 2.3-2.7 GHz band are used for RF transmitters conforming to the WiBRO / WiMAX specification but can also be used for RF transmitters conforming to the IEEE 802.11b / g specification.

The third signal path 350 is used to generate a local oscillation signal 355 for an RF transmitter in accordance with the IEEE 802.11 a / n standard. That is, the third signal path 350 may be referred to as a signal path for WiFi.

Unlike the first and second signal paths 330 and 340, the third signal path 350 uses a local oscillation signal without division.

The buffer 351 amplifies the local oscillating signal in the 5.15 to 5.825 GHz band.

The feedback loop 320 controls the frequency of the local oscillation signal generated by the oscillation circuit 310. Typically, the feedback loop 320 may be implemented using a phase locked loop. A detailed structure of the feedback loop 320 will be described with reference to FIGS. 4 to 6.

4 and 5 show an example of implementing a feedback loop using a digital phase locked loop.

In case of using the conventional analog phase locked loop, the phase locked loop is newly designed whenever the frequency band is changed, but it is not necessary to use the digital phase locked loop. Therefore, it is not necessary to design a new phase locked loop according to various communication standards.

Currently implemented or implementable digital phase locked loops can operate up to several hundred MHz. Therefore, an oscillation signal with a frequency of several GHz cannot be directly used for a digital phase locked loop, and a frequency must be reduced by using a prescaler.

First, referring to FIG. 4, the feedback loop 320 includes a divider 410 for dividing the local oscillation signal generated by the oscillation circuit 310, a buffer 420 for amplifying the divided local oscillation signal, and an amplified local oscillation signal. It includes a prescaler 430 for pre-dividing and a digital phase locked loop 440 for receiving the prescaled local oscillation signal and controlling the frequency of the local oscillation signal generated by the oscillator circuit 310.

The prescaler 430 currently uses an 8/9 prescaler that operates in the 2 GHz band where an IP (Intelectual Property) can be easily obtained. However, since the local oscillation signal generated by the oscillation circuit 310 is a 5 GHz band, the prescaler 430 cannot process the local oscillation signal immediately.

The divider 410 is an analog divider that can operate at very high frequencies. The divider 410 divides the local oscillation signal of the 5 GHz band by 1/2 and provides it to the prescaler 430. The buffer 420 amplifies the 1/2 divided local oscillation signal, and the prescaler 430 prescales the amplified local oscillation signal and provides it to the digital phase locked loop 440.

The digital phase locked loop 440 controls the frequency of the local oscillation signal of the 5 GHz band output by the oscillation circuit 310 by comparing the prescaled local oscillation signal with the reference frequency Fr.

Technically, the divider 410 and buffer 420 of FIG. 4 may be unnecessary if a prescaler is provided that operates at a higher frequency than currently available prescalers.

Referring to FIG. 5, the feedback loop 320 receives a prescaler 530 pre-dividing the local oscillation signal generated by the oscillation circuit 310 and a localized oscillation signal generated by the oscillation circuit 310 after receiving the prescaled local oscillation signal. And digital phase locked loop 540 to control the frequency of the signal.

The digital phase locked loop 540 compares the local oscillation signal prescaled by the prescaler 530 with the reference frequency Fr to control the frequency of the local oscillation signal of the 5 GHz band output by the oscillation circuit 310.

Unlike the feedback loops of FIGS. 4 and 5, a feedback loop may be implemented using an existing analog phase locked loop.

Referring to FIG. 6, the feedback loop 320 includes a divider 610 and an analog phase locked loop 640.

The divider 610 divides the local oscillation signal generated by the oscillation circuit 310 at a predetermined division ratio, and the analog phase locked loop 640 compares the divided local oscillation signal and the reference frequency Fr to generate the oscillation circuit ( The frequency of the local oscillation signal generated by 310 is controlled.

7 illustrates a multimode communication device according to an embodiment of the present invention.

The multi-mode communication device 700 includes a front end 710 including an antenna, a filter, and a duplexer, a first RF transceiver 720 according to a first communication standard, and a second RF transceiver 730 according to a second communication standard. And a multi-mode local oscillator 740 and a digital core 760 that provide local oscillation signals in accordance with the first and second communication standards.

The first RF transceiver 720 and the second RF transceiver 730 are direct conversion transceivers and require local oscillation signals of different bands.

For example, if the first RF transceiver 720 is a WLAN transceiver according to the WLAN standard (IEEE 802.11 a / n) and the second RF transceiver 730 is a WiBRO / WiMAX transceiver according to the WiBRO / WiMAX standard. The transceiver 720 will require a local oscillation signal in the 5 GHz band and the second RF transceiver 730 will require a local oscillation signal in the 2 GHz band.

The multi-mode local oscillator 740 thus provides local oscillation signals of various bands. To this end, the multi-mode local oscillator 740 includes a feedback loop 742 and a plurality of signal paths 743 including a phase locked loop for controlling the frequency of the oscillation circuit 741 and the local oscillation signal of the oscillation circuit 742. 744). The temperature compensation crystal oscillator 770 oscillates a reference frequency for the operation of the feedback loop 742.

The digital core 760 transmits or receives data transmitted or received through the first RF transceiver 720 and the second RF transceiver 730. The digital core 760 performs some digital processing on the received data. Similarly, the digital core 760 provides the first and second RF transceivers 720 and 730 with transmitted data that has undergone some digital processing.

Although FIG. 7 illustrates a multimode communication device including two RF transceivers 720 and 730 as an example, a multimode communication device including three or more RF transceivers is also possible.

For example, the multi-mode communication device may include a WLAN transceiver according to the WLAN communication standard of 5GHz band, a WiBRO / WiMAX transceiver according to the WiBRO / WiMAX communication standard, and a European WiMAX transceiver according to the European WiMAX communication standard. In this case, the multimode local oscillator may use the multimode local oscillator described in Figs.

Although the above embodiments have described a multimode local oscillator and a multimode communication apparatus using the same that support communication standards that are most widely used, this is exemplary. Those skilled in the art to which the present invention pertains may implement a multimode local oscillator including other communication standards with the embodiments disclosed herein.

The multimode local oscillator according to an embodiment of the present invention shares oscillation signal paths with a feedback loop and a voltage controlled oscillator implemented as a complex circuit. Thus, the multimode local oscillator for the integrated chip has a smaller chip area compared to the local oscillation system previously implemented separately.

When the multi-mode local oscillator having such a small chip area is employed, the integrated communication device can be implemented at low cost and it is easy to miniaturize.

The above embodiments are all illustrative, and those skilled in the art may variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

Claims (18)

An oscillation circuit for generating a local oscillation signal; A plurality of oscillation signal paths for providing the local oscillation signal with or without division to an RF transmitter in accordance with each communication standard; And And a feedback loop for controlling the frequency of the local oscillating signal. The multi-mode local oscillator of claim 1, wherein the oscillator circuit generates the local oscillation signal comprising four oscillation signals that are out of phase by 90 degrees. The method of claim 1, wherein the feedback loop is A prescaler for pre-dividing the local oscillation signal; And And a phase-locked loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency. The method of claim 1, wherein the feedback loop is A divider for dividing the local oscillation signal; A buffer for amplifying the divided local oscillation signal; A prescaler for pre-splitting the amplified local oscillation signal; And And a phase locked loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency. 5. The multimode local oscillator according to claim 3 or 4, wherein the phase locked loop is a digital phase locked loop. 2. The apparatus of claim 1, wherein the feedback loop comprises: a divider for dividing the local oscillation signal; And And a phase-locked loop for controlling the frequency of the local oscillating signal by comparing the divided local oscillating signal with a reference frequency. 2. The apparatus of claim 1, wherein at least one of the local oscillation signal paths comprises: a divider for dividing the local oscillation signal by one third; And And a mixer for mixing the local oscillation signal and the 1/3 divided oscillation signal to generate a 2/3 divided oscillation signal. An oscillating circuit for generating a local oscillating signal in the band of about 4.6-5.825 GHz; A WLAN signal path providing an oscillation signal in a band of about 5.15 to 5.825 GHz of the local oscillation signal as it is; A WiBRO / WiMAX signal path for generating an oscillation signal in the 2.3-2.7 GHz band by dividing the oscillation signal in the about 4.6-5.4 GHz band by 1/2 of the local oscillation signal; A European WiMAX signal path for generating an oscillation signal in the about 3.43 to 3.885 GHz band by dividing the oscillation signal in the about 5.15 to 5.825 GHz band by two thirds of the local oscillation signal; And And a feedback loop for controlling the frequency of the local oscillating signal. 9. The multimode local oscillator of claim 8, wherein the oscillator circuit generates the local oscillation signal comprising four oscillation signals that are out of phase by 90 degrees. The method of claim 8, wherein the feedback loop is A prescaler for pre-dividing the local oscillation signal; And And a phase-locked loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency. The method of claim 8, wherein the feedback loop is A divider for dividing the local oscillation signal; A buffer for amplifying the divided local oscillation signal; A prescaler for pre-splitting the amplified local oscillation signal; And And a phase locked loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency. 12. The multimode local oscillator according to claim 10 or 11, wherein the phase locked loop is a digital phase locked loop. 9. The apparatus of claim 8, wherein the feedback loop comprises: a divider for dividing the local oscillation signal; And And a phase-locked loop for controlling the frequency of the local oscillating signal by comparing the divided local oscillating signal with a reference frequency. 9. The apparatus of claim 8, wherein the European WiMAX signal path comprises: a divider for dividing the local oscillating signal by one third; And And a mixer for mixing the local oscillation signal with the one-third divided oscillation signal to generate the local oscillation signal in a band of about 3.43 to 3.885 GHz. A plurality of RF transceivers, each having a different communication standard; An oscillation circuit for generating a local oscillation signal; A plurality of oscillation signal paths for providing the local oscillation signal with or without division to each of the plurality of RF transceivers; And And a feedback loop for controlling the frequency of the local oscillating signal. The method of claim 15, wherein the feedback loop is A prescaler for lowering the frequency of the local oscillation signal; And And a digital phase fixed loop for controlling the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency. WLAN transceiver according to WLAN communication standard of 5GHz band; WiBRO / WiMAX transceivers in accordance with WiBRO / WiMAX communication specifications; European WiMAX transceivers in accordance with European WiMAX communication standards; An oscillating circuit for generating a local oscillating signal in the band of about 4.6-5.825 GHz; A WLAN signal path providing the WLAN transceiver with an oscillation signal in a band of about 5.15 to 5.825 GHz of the local oscillation signal; The oscillation signal in the about 4.6 to 5.4 GHz band is divided into 1/2 of the local oscillation signal to generate the oscillation signal in the about 2.3 to 2.7 GHz band, and the oscillation signal in the about 2.3 to 2.7 GHz band is transmitted to the WiBRO / WiMAX transceiver. Provides WiBRO / WiMAX signal paths; A European WiMAX signal path for generating an oscillation signal in the about 3.43 to 3.885 GHz band by dividing the oscillating signal in the about 5.15 to 5.825 GHz band of the local oscillation signal into 2/3, and providing the oscillating signal in the European to the WiMAX transceiver; And And a feedback loop for controlling the frequency of the local oscillating signal. 18. The system of claim 17, wherein the feedback loop is A prescaler for lowering the frequency of the local oscillation signal; And a digital phase locked loop configured to control the frequency of the local oscillation signal by comparing the prescaled local oscillation signal with a reference frequency.

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