GB2396273A - RF front end for dual band wireless transceiver module - Google Patents
RF front end for dual band wireless transceiver module Download PDFInfo
- Publication number
- GB2396273A GB2396273A GB0314542A GB0314542A GB2396273A GB 2396273 A GB2396273 A GB 2396273A GB 0314542 A GB0314542 A GB 0314542A GB 0314542 A GB0314542 A GB 0314542A GB 2396273 A GB2396273 A GB 2396273A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dual
- paths
- switch
- transmitting
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000009977 dual effect Effects 0.000 title claims description 3
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
- Radio Transmission System (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A radio frequency (RF) front-end employed in a dual-mode transceiver module connects a first and second dual-band antennas, 40a,b and includes a first and a second signal receiving paths for receiving RF signals in two different frequency bands, a first and second signal transmitting paths for transmitting RF signals in the two different frequency bands, and a switch unit connecting the first and second dual-band antennas with the first and second signal transmitting and receiving paths. The switch unit includes a double pole double throw (DPDT) switch 31 and two single pole double throw (SPDT) switches 32,33. The switch unit performs an antenna selection function for both the first and second transmitting paths and the first and second receiving paths.
Description
t 2396273 FRONT END FOR DUAL BAND WIRELESS TRANSCEIVER MODULE
The present invention relates to a radio frequency (RF) front-end design, and more particularly to an RF front-end employed in a dual-band wireless transceiver module.
There are an increasing number of dual-mode wireless communication products becoming 5 available on the market today, e.g. dual-mode cellular phones, dual-mode Wireless Local Area Network (WLAN) cards and Access Points (AP).
RF front-end design is the key and most difficult part in a dual-mode wireless transceiver module design. One problem in RF front-end design is how to design an antenna selection diversity function. Generally, since transmitted signals are much stronger than received 0 signals, antenna selection diversity for receiver is more important than for transmitter. Thus, most designs only have antenna selection diversity for receiver, and there is no antenna diversity for transmitter. Antenna diversity for receiver allows the wireless transceiver module to select an antenna with better performance for the received signals. Since transmitter does not have antenna diversity, there is small insertion loss in the transmitting path. However, 15 such designs usually connect the transmitter path to the antenna directly and results in impedance match difficulty.
Due to the influence of the operating environment, an antenna diversity function in the transmitting path can help improve the quality of the transmitted signals. However, adding the antenna diversity function for transmitter would require adding more control components, 20 which will increase insertion losses in the transmitting path.
Hence, an RF front-end with antenna diversity for both transmitter and receiver and less insertion loss on both transmitter and receiver paths for a dual-mode wireless communication module is desired for overcoming the above mentioned disadvantages.
A main object of the present invention is to provide a radio frequency (RF) front-end for a 25 dual-mode wireless transceiver module.
-2 Another object is to provide a dual-mode RF front-end with antenna selection diversity for both the transmitting path and the receiving path.
An RF front-end according to an embodiment of the present invention, which is employed in a dual-mode transceiver module, includes a first and second dual-band antennas, a first and 5 second signal receiving paths for receiving RF signals in two different frequency bands, a first and second signals transmitting paths for transmitting RF signals in the same two different frequency bands, and a switch unit connecting the first and second dual-band antennas with the first and second signal transmitting and receiving paths. The switch unit includes a double pole double throw (DPDT) switch and two single pole double throw (SPDT) switches, and 0 performs an antenna selection function for both the first and second transmitting paths and the first and second receiving paths.
Otherobjects, advantages and novel features ofthe invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
Fig. I is a block diagram of a dual-mode Wireless Local Area Network (WLAN) module 5 including an RF front-end according to the present invention; and Fig. 2 is a schematic diagram showing an example of an implementation ofthe switch portions of the RF front-end of Fig. 1.
Referring to the drawings, a 802.1 1 a/b dual-mode Wireless Local Area Network (WLAN) module comprises two main parts; a radio frequency (RF) part and a Base-Band part. The RF 20 part includes two dual-band antennas, an RF front-end and an RF integrated circuit (IC). The Base-Band part includes a Base-Band (BB) IC and an interface circuit (not labelled) to the RFIC. The Base-Band part further includes an interface (not shown) to electrically connect with a laptop computer.
The coupling between the RFIC and the BB IC can be conveniently achieved based on a 25 known combined 802.11 a/b chipset solution, and the coupling between the BBIC and the
-3 interface is known to one skilled in the art, so detailed descriptions of these couplings are
omitted herein.
The dual-band antennas 40a,40b operate in the 2.4 to 2.4835 Ghz frequency band and in the 5.15 to 5.825 Ghz frequency band. The RFIC receives signals from and transmits signals to 5 the dual-band antennas via the RF front-end.
The RF front-end includes three switches, four filters, four baluns, two power amplifiers and three logic control units. The three switches control the dual-band antennas' diversity and transmitlreceive functions. The three logic control units control the ON/OFF states of the three switches and the PAs.
0 The switch is a double pole throw (DPDT) switch and comprises pins which respectively connect to the two dual-band antennas which respectively connect to the switches. The switches are single pole double throw (SPDT) switches. The switch connects the pin of the switch selectively with a first frequency band signal transmitting path, which comprises the balun, the PA and the filter, or with a first frequency band signal receiving path which 15 comprises the balun and the filter. The switch connects the pin of the switch selectively with a second frequency band signal transmitting path, which comprises the balun, the PA and the filter, or with a second frequency band signal receiving path which comprises the balun and the filter. The first frequency band can be, for instance, the 2.4-2.4835 Ghz band, and the second frequency band the 5.15 -5.825 Ghz band, or vice versa. The filters are band pass filters 20 and the filters are low pass filters.
Signals received from the dual-band antennas comprise signal fl Rx (2.4-2. 4835 Ghz) and signal f2 Rx (5.15-825 Ghz), which are selected by the combination of switches. The signal fl Rx is filtered by the BPF, and the filtered signal fl Rx is transferred into the RFIC via the balun. Similarly, the signal f2 Rx is filtered by the BPF, and the filtered signal f2 Rx is 2s transferred into the RFIC via the balun.
Signals sent to the dual-band antennas for transmission comprise a signal fl Tx (2.4-2.4835 Ghz) and a signal f2 Tx (5.15-5.825 Ghz), which are generated by the RFIC. The signal fl Tx
-4 is sent to the PA via the balun. The signal fl Tx, after it has been amplified by the PA, is filtered by the LPF, and the filtered signal fl Tx is routed to the dual-band antennas through the switches. Similarly, the signal f2 Tx is first sent to the PA via the balun. The signal f2 Tx, after it has been amplified by the PA, is filtered by the LPF, and the filtered signal f2 Tx is 5 routed to the dual-band antennas through the switches.
The #1 logic control unit is controlled by an antenna diversity control signal (ANT_Control) from the BBIC and outputs signals V1 and V2 to control the switch. When the voltage level of the signal VI is low and the voltage level of the signal V2 is high, the pins are connected and the pins are connected; when the voltage level ofthe signal VI is high and the voltage level 0 of the signal V2 is low, the pins are connected and the pins are connected. Therefore, the antenna selection function of the RF front-end is achieved by the switch and the #1 logic control unit.
The #2 logic control unit is controlled by a transmitting/receiving control signal (Tx_Rx Control) from the BBIC and controls the switches to connect the transmitting paths or the 5 receiving paths. When the transmitting paths are ON, the receiving paths are OFF; when the receiving paths are ON, the transmitting paths are OFF. By ensuring that only the transmitting paths or the receiving paths are connected at one time, good isolation between the transmitting paths and the receiving paths is ensured.
The #3 logic control unit controls the two Pas and is itself controlled by a combination of 20 signals, which include a PA power control signal (PA PWR_Control), a frequency band control signal (BAND_Control) and the Tx_Rx_Control signal from the BBIC. When the PA301 is ON, the PA 302 is OFF; when the PA 302 is ON, the PA 301 is OFF. Only one PA is enabled at a time so that when one transmitting path is selected, the associated PA is enabled to transmit signals, and the PA in the second transmitting path will be disabled.
25 When the 802.1 la/b dual-mode WEAN module transmits signals, the switches connect the transmitting paths under the control of the Tx_Rx_Control signal, and the #3 logic control unit selects which PA is turned ON to enable the corresponding transmitting path.
-5 When the 802.1 la.b dual-mode WEAN module receives signals, the switches connect the receiving paths under the control of the Tx_Rx_Control signal.
The 802. l 1 a/b dual-mode WLAN module is mounted into the laptop computer and the two dual-band antennas are located in different locations in the laptop computer. Thus, the two 5 dual-band antennas have different receiving/transmitting performances for incoming/outgoing signals. The ANT_Control signal controls the switch to select a dual-band antenna that has the better receiving/transmitting performance.
Using this design of an antenna selection function, either the receiving paths or the transmitting paths will be enabled at a given time. Thus, the receiving paths will be well lo isolated from the transmitting paths. Additionally, since only two-switch control stage is used on each transmitting or receiving path, lower insert losses are achieved in the transmitting or receiving paths.
This design can be used not only in the design of RF front-ends for 802.1 la/b dual-mode WEAN modules, but can also be used in the design of any other dual-band wireless transceiver module for wireless communication devices, such as cellular phones.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of
the structure and function of the invention, the disclosure is illustrative only, and changes may
be made in detail, especially in matters of shape, size, and arrangement of parts within the so principles of the invention to the full extent indicated by the broad general meaning of the terems in which the appended claims are expressed.
Claims (8)
1. A radio frequency (RF) front-end adapted to be employed in a dual-mode transceiver module, wherein the dual-mode transceiver module has first and second dual-band antennas, first and second signal transmitting paths and first and second signal receiving paths, 5 comprising: a double pole double throw (DPDT) switch having first and second output pins respectively coupling to the first and the second dual -band antennas, and first and second input pins; a first single pole double throw (SPDT) switch coupling the second input pin with the lo first signal transmitting and receiving paths of the dual-mode transceiver module; and a second SPDT switch coupling the first input pin with the second signal transmitting and receiving paths of the dual-mode transceiver module.
2. The RF front-end as claimed in claim 1, further comprising a first logic control unit to control the DPDT switch to select either the first output and input pins being connected and 5 the second output and input pins being connected, or the first output pin and the second input pin being connected and the second output pin and the first input pin being connected.
3. The RF front-end as claimed in claim 2, further comprising a second logic control unit to control the first and second SPDT switches to enable either the first and second signal transmitting paths or the first and second signal receiving paths.
20
4. An RF front-end adapted to be employed in a dual-mode transceiver module, comprising: first and second antennas; first and second signal receiving paths for receiving RF signals in two different frequency bands; 25 first and second signal transmitting paths for transmitting RF signals in the two different frequency bands; and
-7 a switch unit connecting the first and second antennas with the first and second signal transmitting and receiving paths, and performing an antenna selection function in both the first and second transmitting paths and the first and second receiving paths.
5. The RF front-end as claimed in claim 4, wherein the switch unit comprises a DPDT 5 switch coupling to the first and second antennas, a first SPDT switch connecting the DPDT switch with the first signal transmitting and receiving paths, and a second SPDT switch connecting the DPDT switch with the second signal transmitting and receiving paths.
6. The RF front-end as claimed in claim 4, wherein the first and second signal transmitting paths respectively comprises a first and second power amplifiers (PA).
0
7. The RF front-end as claimed in claim 6, further comprising a logic control unit to enable either the first PA or the second PA.
8. A radio frquency (RF) front-end adapted to be employed in a dual-mode transceiver module, wherein the dual-mode transceiver module has first and second dual-band antennas, first and second signal transmitting paths and first and second signal receiving paths, 5 comprising: a first switch having first and second output pins respectively coupling to the first and the second dual-band antennas, and first and second input pins; a second switch coupling the second input pin with the first signal transmitting and receiving paths of the dual-mode transceiver mdoule; 20 a third switch coupling the first input pin with the second signal transmitting and receiving paths of the dual-mode transceiver module; a first power amplifier connected to the first transmitting path; and a second power amplifier connected to the second transmitting path; wherein the transmitting paths and the receiving paths are mutually exclusive enabled, and the 25 first power amplifier and the second power amplifier are mutually exclusively enabled.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/318,249 US20040204037A1 (en) | 2002-08-21 | 2002-12-11 | RF front-end for dual-band wireless transceiver module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0314542D0 GB0314542D0 (en) | 2003-07-30 |
| GB2396273A true GB2396273A (en) | 2004-06-16 |
Family
ID=27662894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0314542A Withdrawn GB2396273A (en) | 2002-12-11 | 2003-06-23 | RF front end for dual band wireless transceiver module |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2004194340A (en) |
| KR (1) | KR20040051479A (en) |
| CN (1) | CN1507164A (en) |
| GB (1) | GB2396273A (en) |
| TW (1) | TW200410507A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006021481A1 (en) | 2004-08-24 | 2006-03-02 | Siemens Aktiengesellschaft | Baseband chip, communication module, printed circuit board comprising peripheral devices and method for controlling said type of peripheral devices |
| WO2007148261A3 (en) * | 2006-06-22 | 2008-06-19 | Nxp Bv | Dual band receiver with control means for preventing signal overloading |
| EP2110953A1 (en) | 2008-02-29 | 2009-10-21 | Research In Motion Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
| CN108683439A (en) * | 2018-04-08 | 2018-10-19 | 努比亚技术有限公司 | Antenna links scenarios method of adjustment, mobile terminal and computer readable storage medium |
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| KR100729341B1 (en) * | 2006-06-29 | 2007-06-18 | 주식회사 알에프엔진 | Wireless communication signal transmission / reception path selector |
| CN101981755A (en) * | 2008-04-10 | 2011-02-23 | 西门子公司 | Antenna module |
| CN101604993B (en) * | 2008-06-11 | 2013-02-13 | 联想(北京)有限公司 | Multiaerial system and method for radiating radio frequency signals |
| TWI387219B (en) * | 2008-10-17 | 2013-02-21 | Hon Hai Prec Ind Co Ltd | Wireless communication device |
| CN101409571B (en) * | 2008-11-27 | 2012-08-08 | 华为终端有限公司 | Switchable antenna and electronic device |
| US20100144287A1 (en) * | 2008-12-04 | 2010-06-10 | Horen Chen | Wireless communication device utilizing external processors and memories |
| CN102196517B (en) * | 2010-03-05 | 2013-11-13 | 无锡博欧电子科技有限公司 | Mobile communication base station radio frequency signal sector switching system |
| US20110319107A1 (en) * | 2010-03-05 | 2011-12-29 | Wuxi Boou Electronic Technological Ltd. | Mobile communication base station radio frequency signal sector switching system |
| CN101814928A (en) * | 2010-03-23 | 2010-08-25 | 华为终端有限公司 | Receiving device and method |
| CN101860371B (en) * | 2010-06-02 | 2013-07-03 | 惠州Tcl移动通信有限公司 | Wireless transmitting device and wireless terminal |
| WO2012027703A2 (en) * | 2010-08-26 | 2012-03-01 | Wispry, Inc. | Tunable radio front end and methods |
| KR101840879B1 (en) | 2011-12-26 | 2018-03-22 | 한국전자통신연구원 | RF front-end apparatus of wireless transceiver using RF passive elements |
| CN103516379A (en) * | 2012-06-28 | 2014-01-15 | 国基电子（上海）有限公司 | Wireless communication module |
| CN103684508A (en) * | 2012-09-12 | 2014-03-26 | 苏佳宁 | Low-energy consumption wireless transmission module structure running under complex environment |
| CN103066939B (en) * | 2012-12-26 | 2016-01-20 | 福建星海通信科技有限公司 | Asterism formula coupling network, asterism formula coupler and control method thereof |
| CN105098356A (en) * | 2015-09-09 | 2015-11-25 | 天津七一二通信广播有限公司 | Ultraviolet (UV) frequency band and S frequency band dual-mode integrated antenna system applied to communication terminal |
| CN110768693B (en) * | 2018-07-26 | 2022-01-07 | 瑞昱半导体股份有限公司 | Dual-mode wireless transceiver |
| TWI670946B (en) | 2018-07-30 | 2019-09-01 | 瑞昱半導體股份有限公司 | Transceiver control circuit for reducing operating mode transition period of transceiver |
| CN112886973B (en) * | 2021-01-28 | 2022-08-26 | 维沃移动通信有限公司 | Radio frequency circuit and electronic equipment |
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| EP0823790A2 (en) * | 1996-08-07 | 1998-02-11 | Nokia Mobile Phones Ltd. | Dual band mobile station employing cross-connected transmitter and receiver circuits |
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| EP0892459A1 (en) * | 1997-07-08 | 1999-01-20 | Nokia Mobile Phones Ltd. | Double resonance antenna structure for several frequency ranges |
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2003
- 2003-04-16 TW TW092108865A patent/TW200410507A/en unknown
- 2003-04-26 CN CNA031230210A patent/CN1507164A/en active Pending
- 2003-06-23 GB GB0314542A patent/GB2396273A/en not_active Withdrawn
- 2003-07-02 KR KR1020030044640A patent/KR20040051479A/en not_active Withdrawn
- 2003-12-11 JP JP2003413768A patent/JP2004194340A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0823790A2 (en) * | 1996-08-07 | 1998-02-11 | Nokia Mobile Phones Ltd. | Dual band mobile station employing cross-connected transmitter and receiver circuits |
| US6115585A (en) * | 1996-08-07 | 2000-09-05 | Nokia Mobile Phones Limited | Antenna switching circuits for radio telephones |
| WO1998047225A1 (en) * | 1997-04-17 | 1998-10-22 | Motorola Inc. | Dual-band filter network |
| EP0892459A1 (en) * | 1997-07-08 | 1999-01-20 | Nokia Mobile Phones Ltd. | Double resonance antenna structure for several frequency ranges |
| WO1999062195A1 (en) * | 1998-05-22 | 1999-12-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Harmonic suppression in dual band mobile phones |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006021481A1 (en) | 2004-08-24 | 2006-03-02 | Siemens Aktiengesellschaft | Baseband chip, communication module, printed circuit board comprising peripheral devices and method for controlling said type of peripheral devices |
| WO2007148261A3 (en) * | 2006-06-22 | 2008-06-19 | Nxp Bv | Dual band receiver with control means for preventing signal overloading |
| EP2110953A1 (en) | 2008-02-29 | 2009-10-21 | Research In Motion Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
| US7973725B2 (en) | 2008-02-29 | 2011-07-05 | Research In Motion Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
| US8310401B2 (en) | 2008-02-29 | 2012-11-13 | Research In Motion Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
| US8462057B2 (en) | 2008-02-29 | 2013-06-11 | Research In Motion Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
| US8599077B2 (en) | 2008-02-29 | 2013-12-03 | Blackberry Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
| US8742996B2 (en) | 2008-02-29 | 2014-06-03 | Blackberry Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
| US9954269B2 (en) | 2008-02-29 | 2018-04-24 | Blackberry Limited | Mobile wireless communications device with selective load switching for antennas and related methods |
| CN108683439A (en) * | 2018-04-08 | 2018-10-19 | 努比亚技术有限公司 | Antenna links scenarios method of adjustment, mobile terminal and computer readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004194340A (en) | 2004-07-08 |
| GB0314542D0 (en) | 2003-07-30 |
| TW200410507A (en) | 2004-06-16 |
| CN1507164A (en) | 2004-06-23 |
| KR20040051479A (en) | 2004-06-18 |
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