WO2013075539A1 - Dispositif de duplexage par répartition en fréquence et terminal mobile correspondant - Google Patents

Dispositif de duplexage par répartition en fréquence et terminal mobile correspondant Download PDF

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Publication number
WO2013075539A1
WO2013075539A1 PCT/CN2012/081420 CN2012081420W WO2013075539A1 WO 2013075539 A1 WO2013075539 A1 WO 2013075539A1 CN 2012081420 W CN2012081420 W CN 2012081420W WO 2013075539 A1 WO2013075539 A1 WO 2013075539A1
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Prior art keywords
band
capacitor
filter
receiving
frequency
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PCT/CN2012/081420
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English (en)
Chinese (zh)
Inventor
白剑
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惠州Tcl移动通信有限公司
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Publication of WO2013075539A1 publication Critical patent/WO2013075539A1/fr

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    • 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
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver

Definitions

  • the present invention relates to the field of communications, and in particular, to a frequency division duplexer and a mobile terminal.
  • the duplexer is an indispensable device. It usually consists of two or more bandpass filters of different frequencies, and isolates the received signal and the transmitted signal to prevent the transmission signal of the mobile terminal from being transmitted to the receiver.
  • the insertion loss of the duplexer under the current state of the art is very large, for the following reasons:
  • the parameters of the bandpass filter need to be the center frequency of 1950MHz and the transition band of 20MHz.
  • Such a band stop filter is not only very difficult to implement, but also has a large insertion loss.
  • WCDMA uses a duplexer with a frequency of 1900MHz, and its insertion loss is above 2.5dB.
  • the receiving path requires that the signal can work under extremely weak signals, which is typically -110 dBm; and the transmitting path requires the transmission power to be increased as much as possible to ensure other mobile terminals.
  • the receiving effect is typically 28dB.
  • a transmission power of up to 28 dB inevitably leads to strong spurious interference. If these spurious interferences are directly fed into the receiving path, the sensitivity of the receiving path is affected, and the received signal is directly flooded. .
  • the transmit path will output -132 dBm/Hz of noise, and the input noise required by the receive path must be below -173 dBm/Hz. Therefore, a typical duplexer must provide 41 dB of isolation. The insertion loss of the duplexer is very large.
  • the amplifier of the previous stage of the duplexer must increase the output power, thereby causing an increase in the power consumption of the mobile terminal, which increases the load on the battery of the mobile terminal.
  • the technical problem to be solved by the present invention is to provide a frequency division duplexer and a mobile terminal, which can effectively reduce the insertion loss of the duplexer.
  • a technical solution adopted by the present invention is to provide a mobile terminal, including: a wireless transceiver, a transmitting surface acoustic filter, a power amplifier, a frequency division duplexer, an antenna, and a matching network; a wireless transceiver for receiving or transmitting a signal, one end is connected to the input end of the transmitting surface acoustic filter, the other end is connected to the receiving end of the frequency division duplexer; and the acoustic surface filter is used for selecting the emission a frequency, an output terminal is connected to an input end of the power amplifier; a power amplifier, an output end is connected to a transmitting end of the frequency division duplexer; a frequency division duplexer includes a receiving path and a transmitting path, and the transmitting path is adopted a low pass filter or a band limiting filter, the external terminal being connected to the antenna, wherein the low pass filter is a capacitive inductive filter; the matching network device is configured to implement impedance
  • the capacitive inductive filter includes a plurality of sets of LC ⁇ type filter circuits.
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor, and a second capacitor.
  • the first capacitor has one end grounded end, and the other end is connected to one end of the inductor. Connected, the other end of the inductor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the first group of LC ⁇ type filter circuits
  • the second capacitor, the second group of LC ⁇ type filter circuits and the third group of LC ⁇ type filter circuits share the second capacitor of the second group of LC ⁇ type filter circuits, and so on.
  • the receiving band noise level of the receiving path is -173 dBm/Hz.
  • the suppression degree of the receiving frequency band is below 20 dB.
  • the wireless transceiver has a maximum output power of 6.5 dBm in the frequency bands 1, 4, 5, and 8, a minimum output power of -76 dBm, a receiving band noise of -140 dBm/Hz, and a maximum output power of 7 dBm in the frequency band 2,
  • the minimum output power is -76dBm
  • the receiving band noise is -139dBm/Hz
  • the insertion acoustic surface filter has an insertion loss of 2.5dB in each frequency band, and the receiving band attenuation is 30dB; the power amplifier transmits in each frequency band.
  • the amplification gain of the band is 24dB, the amplification gain in the receiving band is 18dB, and the noise of the total output receiving band is -151dBm/Hz; the insertion loss of the frequency division duplexer in the bands 1, 4, 5, 8 is 0.5dB.
  • the insertion loss in band 2 is 1 dB, the noise attenuation in the receiving band is 20 dB in each frequency band, and the noise in the output receiving band is -173.5 dBm/Hz.
  • a frequency division duplexer which includes: a receiving path and a transmitting path, and the transmitting path adopts a low pass filter or a band limiting filter.
  • the low pass filter is a capacitive inductive filter.
  • the capacitive inductive filter includes a plurality of sets of LC ⁇ type filter circuits
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor, and a second capacitor, wherein the first capacitor is grounded at one end, and the other end is connected to one end of the inductor.
  • the other end of the inductor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the first group of LC ⁇ type filter circuits.
  • the second capacitor, the second group of LC ⁇ type filter circuits and the third group of LC ⁇ type filter circuits share the second capacitor of the second group of LC ⁇ type filter circuits, and so on.
  • a mobile terminal including: a wireless transceiver, a transmitting surface acoustic filter, a power amplifier, a frequency division duplexer and an antenna; and a wireless transceiver For receiving or transmitting a signal, one end is connected to the input end of the transmitting surface acoustic filter, the other end is connected to the receiving end of the frequency division duplexer; and the acoustic surface filter is used for selecting the transmitting frequency and outputting
  • the terminal is connected to the input end of the power amplifier; the power amplifier has an output connected to the transmitting end of the frequency division duplexer; the frequency division duplexer includes a receiving path and a transmitting path, and the transmitting path adopts low-pass filtering. Or band limiting filter, the external terminal is connected to the antenna.
  • the low pass filter is a capacitive inductive filter.
  • the capacitive inductive filter includes a plurality of sets of LC ⁇ type filter circuits.
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor, and a second capacitor.
  • the first capacitor has one end grounded end, and the other end is connected to one end of the inductor. Connected, the other end of the inductor is connected to one end of the second capacitor, the other end of the second capacitor is grounded, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the first group of LC ⁇ type filter circuits
  • the second capacitor, the second group of LC ⁇ type filter circuits and the third group of LC ⁇ type filter circuits share the second capacitor of the second group of LC ⁇ type filter circuits, and so on.
  • the terminal further includes: a matching network device, configured to implement impedance matching between the wireless transceiver and the antenna, one end is connected to the output end of the frequency division duplexer, and the other end is connected to the antenna.
  • a matching network device configured to implement impedance matching between the wireless transceiver and the antenna, one end is connected to the output end of the frequency division duplexer, and the other end is connected to the antenna.
  • the receiving band noise level of the receiving path is -173 dBm/Hz.
  • the suppression degree of the receiving frequency band is below 20 dB.
  • the wireless transceiver has a maximum output power of 6.5 dBm in the frequency bands 1, 4, 5, and 8, a minimum output power of -76 dBm, a receiving band noise of -140 dBm/Hz, and a maximum output power of 7 dBm in the frequency band 2,
  • the minimum output power is -76dBm
  • the receiving band noise is -139dBm/Hz
  • the insertion acoustic surface filter has an insertion loss of 2.5dB in each frequency band, and the receiving band attenuation is 30dB; the power amplifier transmits in each frequency band.
  • the amplification gain of the band is 24dB, the amplification gain in the receiving band is 18dB, and the noise of the total output receiving band is -151dBm/Hz; the insertion loss of the frequency division duplexer in the bands 1, 4, 5, 8 is 0.5dB.
  • the insertion loss in band 2 is 1 dB, the noise attenuation in the receiving band is 20 dB in each frequency band, and the noise in the output receiving band is -173.5 dBm/Hz.
  • the invention has the advantages that the insertion loss of the prior art duplexer is very large, and the present invention provides a frequency division duplex duplexer whose transmission path adopts a low-pass filter with low insertion loss or The band limit filter replaces the band gap filter with high insertion loss, and re-determines the parameters of each component according to the noise level of the receiving band and the suppression degree of the receiving band, thereby effectively reducing the insertion loss of the duplexer and reducing The heat generated by the mobile terminal.
  • FIG. 1 is a circuit diagram of an embodiment of a frequency division duplexer of the present invention
  • FIG. 3 is a schematic structural diagram of an embodiment of a mobile terminal according to the present invention.
  • FIG. 4 is a schematic structural diagram of another embodiment of a mobile terminal according to the present invention.
  • the duplexer is an indispensable device in the mobile terminal.
  • the duplexer can easily distinguish the received information from the transmitted information by dividing two different frequency intervals so that the receiving path and the transmitting path operate in different frequency intervals. .
  • today's duplexers are usually implemented with band-stop filters. Due to the operating frequency of the mobile terminal, the transition band of the band rejection filter can only be 20 MHz, and must provide isolation of up to 41 dB, which results in a very large insertion loss of the duplexer.
  • the present invention provides a frequency division duplexer including a receiving path and a transmitting path.
  • the transmission path uses a low-pass filter or a band-limited filter with low insertion loss instead of a high insertion loss band-stop filter.
  • a capacitive inductive filter is one of the low pass filters.
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor and a second capacitor.
  • the first capacitor has one end grounded, the other end is connected to one end of the inductor, the other end of the inductor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded. .
  • the capacitor inductor filter comprises a plurality of sets of LC ⁇ type filter circuits, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the second capacitor of the first group of LC ⁇ type filter circuits, and the second group of LC ⁇
  • the type filter circuit shares the second capacitance of the second group of LC type filter circuits with the third group of LC type filter circuits, and so on.
  • the first capacitor of the first group of LC ⁇ type filter circuits has a value of 4.2 pF, an inductance value of 4.1 nH, and a second capacitor value of 4.3 pF.
  • the inductance of the second group of LC-type filter circuits is 6.2 nH, and the value of the second capacitor is 4.3 pF.
  • the inductance of the LC mode filter circuit of the third group is 6.2 nH, and the value of the second capacitor is 4.3 pF.
  • the inductance of the LC filter of the fourth group is 5.6 nH, and the value of the second capacitor is 4.3 pF.
  • the inductance of the LC-type filter circuit of the fifth group is 5.6 nH, and the value of the second capacitor is 4.3 pF.
  • the inductance of the LC filter of the sixth group is 5.1 nH, and the value of the second capacitor is 3.3 pF.
  • the connection between the first capacitor and the inductor of the first group of LC-type filter circuits is taken as the input, and the connection between the second capacitor and the inductor of the sixth group of LC-type filter circuits is used as an output, and the capacitor inductance filter can be obtained by simulation technology.
  • the insertion loss characteristic curve, as shown in Fig. 2 can be found that the maximum insertion loss of the modified capacitor filter is 0.3 dB, which is much lower than the typical insertion loss of the duplexer using a band-stop filter of 2.5 dB.
  • the present invention provides a frequency division duplexer whose transmission path replaces the original high insertion loss with a low-pass filter or a band-limited filter with low insertion loss.
  • the band-stop filter effectively reduces the insertion loss of the duplexer.
  • the present invention also provides a mobile terminal, as shown in FIG. 3, comprising: a wireless transceiver 110, a transmitting surface acoustic filter 120, a power amplifier 130, a frequency division duplexer 140, a matching network 150, and an antenna 160.
  • the wireless transceiver 110 is configured to receive or transmit a signal, one end of which is coupled to the input of the transmitting surface acoustic filter 120, and the other end of which is coupled to the receiving end of the frequency division duplexer 140.
  • the output of the transmitted acoustic surface filter 120 is coupled to the input of the power amplifier 130.
  • the input electrical signal is converted into an acoustic signal by an input transducer, the acoustic signal propagates along the surface of the piezoelectric substrate, and is converted into an electrical signal at the output transducer, by selecting an appropriate substrate material, and transducing the two
  • the device performs weighting to implement the frequency selection function. By transmitting the selection of the acoustic surface filter 120, the transmitted signal can be limited to a particular frequency and the interfering signal at the non-operating frequency can be filtered.
  • the output of power amplifier 130 is coupled to the transmit end of frequency division duplexer 140. After the transmitted signal is amplified by the power amplifier 130, sufficient power is obtained to be transmitted through the antenna 160 into the space to be received by the next receiving end, such as the base station and the mobile terminal, as much as possible.
  • the frequency division duplexer 140 includes a receiving path and a transmitting path. And the transmission path uses a low-pass filter or a band-limited filter with low insertion loss instead of a high insertion loss band-stop filter.
  • a capacitive inductive filter is one of the low pass filters.
  • the LC ⁇ type filter circuit includes a first capacitor, an inductor and a second capacitor.
  • the first capacitor has one end grounded, the other end is connected to one end of the inductor, the other end of the inductor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded. .
  • the capacitor inductor filter comprises a plurality of sets of LC ⁇ type filter circuits, and the first group of LC ⁇ type filter circuits and the second group of LC ⁇ type filter circuits share the second capacitor of the first group of LC ⁇ type filter circuits, and the second group of LC ⁇
  • the type filter circuit shares the second capacitance of the second group of LC type filter circuits with the third group of LC type filter circuits, and so on.
  • the first capacitor of the first group of LC ⁇ type filter circuits has a value of 4.2 pF, an inductance value of 4.1 nH, and a second capacitor value of 4.3 pF.
  • the inductance of the second group of LC-type filter circuits is 6.2 nH, and the value of the second capacitor is 4.3 pF.
  • the inductance of the LC mode filter circuit of the third group is 6.2 nH, and the value of the second capacitor is 4.3 pF.
  • the inductance of the LC filter of the fourth group is 5.6 nH, and the value of the second capacitor is 4.3 pF.
  • the inductance of the LC-type filter circuit of the fifth group is 5.6 nH, and the value of the second capacitor is 4.3 pF.
  • the inductance of the LC filter of the sixth group is 5.1 nH, and the value of the second capacitor is 3.3 pF.
  • the connection between the first capacitor and the inductor of the first group of LC-type filter circuits is taken as the input, and the connection between the second capacitor and the inductor of the sixth group of LC-type filter circuits is used as an output, and the capacitor inductance filter can be obtained by simulation technology.
  • the insertion loss characteristic curve, as shown in Fig. 2 can be found that the maximum insertion loss of the modified capacitor filter is 0.3 dB, which is much lower than the typical insertion loss of the duplexer using a band-stop filter of 2.5 dB.
  • the matching network device 150 is used to implement impedance matching between the wireless transceiver 110 and the antenna 160, one end of which is connected to the output of the frequency division duplexer 140, and the other end of which is connected to the antenna 160.
  • the antenna 160 is a printed antenna printed on the circuit board, and both the received signal and the transmitted signal are transmitted and received through the antenna 160.
  • a strip antenna made of metal or the like may be used, which is not limited in the present invention.
  • the mobile terminal of the present invention can be applied to various types of mobile communication technologies such as CDMA, WCDMA, GSM, and the like.
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GSM Global System for Mobile communications
  • WCDMA has nine working frequency bands: Working frequency Frequency (MHz) Working country Band 1 2,100 Band 2 1,900 Band 3 1,800 Band 4 2,100/1,700 Band 5 850 United States Band 6 850 Japan Band 7 2,500 Band 8 900 Band 9 1,700 Japan
  • the mobile terminal provided by the present invention is freely selectable to operate in the frequency bands 1, 2, 4, 5, 8. Therefore, the mobile terminal is provided with multiple branches, and each branch has a transmitting surface acoustic filter. 220, power amplifier 230, frequency division duplexer 240, matching network 250.
  • Each of the transmitted acoustic surface filters 220 has a different selected operating frequency and can be set to operate in the frequency bands 1, 2, 4, 5, 8, respectively.
  • the signal selected by the transmitted acoustic surface filter 220 is amplified by the power amplifier 230, transmitted to the matching network 250 via the transmission path of the frequency division duplexer 240, and then transmitted to the antenna 260 via the multi-way operating switch 270. If the antenna 260 receives the received signal, it is transmitted to the matching network 250 via the multi-way switch 270 and then transmitted to the wireless transceiver 210 through the receive path of the frequency duplexer 240.
  • the mobile terminal uses the low-pass filter to reduce the insertion loss of the frequency division duplexer 240, the suppression of the receiving frequency band is deteriorated due to the nature of the low-pass filter itself, and the power is increased in order to ensure the quality of the communication.
  • Noise suppression requirements of amplifier 230 and wireless transceiver 210 Adding noise suppression to power amplifier 230 and wireless transceiver 210 is difficult to achieve under the prior art. Thus, it is necessary to reallocate the parameters of the various parts of the mobile terminal such that the degree of suppression of the received frequency band operates within an acceptable range.
  • the receiving band noise level of the receiving path of the mobile terminal is -173 dBm/Hz, and the maximum suppression degree of the receiving band is 20 dB.
  • the maximum output power of the wireless transceiver 210 in the frequency bands 1, 4, 5, 8 is 6.5 dBm, the minimum output power is -76 dBm, and the receiving band noise is -140 dBm/Hz, in the frequency band 2
  • the maximum output power is 7dBm, the minimum output power is -76dBm, and the noise in the receiving band is -139dBm/Hz.
  • the transmission acoustic surface filter 220 has an insertion loss of 2.5 dB in each frequency band and an attenuation of 30 dB in the reception band.
  • the power amplifier 230 has an amplification gain of 24 dB in the transmission band of each frequency band, an amplification gain of 18 dB in the receiving band, and a noise of -151 dBm/Hz in the total output receiving band.
  • the insertion loss of the frequency division duplexer 240 in the frequency bands 1, 4, 5, and 8 is 0.5 dB, the insertion loss in the frequency band 2 is 1 dB, and the noise attenuation in the receiving frequency band is 20 dB in each frequency band, and the noise in the output receiving frequency band is -173.5dBm/Hz.
  • the insertion loss of the multi-way switch 270 is 0.8 dB at a high frequency and 0.5 dB at a low frequency.
  • the insertion loss of the transmission line is: high frequency 0.7dB, low frequency 0.5dB.
  • the insertion loss of the frequency division duplexer 240 corresponding to the frequency bands 2, 8 is reduced from 2.5 dB to 1 dB, saving 70 mA of current, which significantly reduces the heat generation of the mobile terminal.
  • the insertion loss of the frequency division duplexer 240 corresponding to other frequency bands is reduced from 1.5 dB to 0.5 dB, which also saves 50 mA of current, which significantly reduces the heat generation of the mobile terminal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

La présente invention se rapporte à un dispositif de duplexage par répartition en fréquence et à un terminal mobile correspondant. Le dispositif de duplexage par répartition en fréquence selon l'invention comprend une voie de réception et une voie de transmission, la voie de transmission utilisant un filtre passe-bas ou un filtre à bande limitée. Le terminal mobile selon l'invention comprend : un appareil émetteur-récepteur radio ; un filtre d'émission à ondes acoustiques de surface ; un amplificateur de puissance ; un dispositif de duplexage par répartition en fréquence ; et une antenne. L'appareil émetteur-récepteur radio est utilisé afin de recevoir ou de transmettre un signal ; un côté de l'appareil émetteur-récepteur radio est raccordé à une extrémité d'entrée du filtre d'émission à ondes acoustiques de surface ; et l'autre côté de l'appareil émetteur-récepteur radio est raccordé à une extrémité de réception du dispositif de duplexage par répartition en fréquence. Le filtre d'émission à ondes acoustiques de surface est utilisé afin de sélectionner une fréquence de transmission ; une extrémité de sortie du filtre d'émission à ondes acoustiques de surface est raccordée à une extrémité d'entrée de l'amplificateur de puissance ; et une extrémité de sortie de l'amplificateur de puissance est raccordée à un côté de transmission du dispositif de duplexage par répartition en fréquence. Le dispositif de duplexage par répartition en fréquence comprend une voie de réception et une voie de transmission ; la voie de transmission utilise un filtre passe-bas ou un filtre à bande limitée ; et une extrémité sur le côté externe du dispositif de duplexage par répartition en fréquence est raccordée à l'antenne. La solution technique décrite dans la présente invention permet : de réduire efficacement la perte d'insertion du duplexeur ; et de réduire la quantité de chaleur produite par le terminal mobile.
PCT/CN2012/081420 2011-11-23 2012-09-14 Dispositif de duplexage par répartition en fréquence et terminal mobile correspondant WO2013075539A1 (fr)

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CN201110376650.2 2011-11-23
CN201110376650.2A CN102420686B (zh) 2011-11-23 2011-11-23 一种频分双工器及移动终端

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CN110690582A (zh) * 2018-07-04 2020-01-14 昆山展腾电子科技有限公司 天线装置

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CN102420686B (zh) * 2011-11-23 2015-07-29 惠州Tcl移动通信有限公司 一种频分双工器及移动终端
US9692392B2 (en) 2012-09-11 2017-06-27 Qualcomm Incorporated Filters for multi-band wireless device
CN106100652B (zh) * 2016-05-31 2018-11-27 广东欧珀移动通信有限公司 杂散抑制装置及方法
CN106452471B (zh) * 2016-09-29 2019-10-11 宇龙计算机通信科技(深圳)有限公司 一种gsm射频电路及包括该电路的终端
CN107104685B (zh) 2017-05-27 2020-11-13 惠州Tcl移动通信有限公司 一种扩展lte b41频段带宽的移动终端及其方法

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