US20070183348A1 - High-frequency circuit apparatus and communication apparatus using the same - Google Patents

High-frequency circuit apparatus and communication apparatus using the same Download PDF

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Publication number
US20070183348A1
US20070183348A1 US11/478,849 US47884906A US2007183348A1 US 20070183348 A1 US20070183348 A1 US 20070183348A1 US 47884906 A US47884906 A US 47884906A US 2007183348 A1 US2007183348 A1 US 2007183348A1
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Prior art keywords
signal
communication system
frequency
send
duplexer
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Abandoned
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US11/478,849
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English (en)
Inventor
Takao Totsuka
Takashi Shiba
Osamu Hikino
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Hitachi Media Electronics Co Ltd
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Hitachi Media Electronics Co Ltd
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Assigned to HITACHI MEDIA ELECTRONICS CO., LTD. reassignment HITACHI MEDIA ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIKINO, OSAMU, SHIBA, TAKASHI, TOTSUKA, TAKAO
Publication of US20070183348A1 publication Critical patent/US20070183348A1/en
Priority to US11/976,955 priority Critical patent/US7570622B2/en
Priority to US11/976,954 priority patent/US7760691B2/en
Priority to US11/976,956 priority patent/US20080137560A1/en
Abandoned legal-status Critical Current

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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
    • H04B1/005—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
    • H04B1/0057—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 diplexing or multiplexing filters for selecting the desired band
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H9/72—Networks using surface acoustic waves
    • H03H9/725—Duplexers
    • 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
    • H04B1/48—Transmit/receive switching in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter

Definitions

  • the present invention relates to a high-frequency circuit apparatus and a communications apparatus using this device.
  • JP-A-2005-210460 discloses therein a so-called dual-support radiocommunication terminal device which has the functional supportability to a plurality of modulation methods.
  • a high-frequency circuit apparatus responsive to send and received signals of a first modulation method and a second modulation method, the apparatus having:
  • DPX 1 a duplexer for performing wave separation of send and received signals as input thereto
  • LPF 1 a filter for filtering the input send signal
  • the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer (DPX 1 ), and
  • the received signal of the second modulation method is wave-separated by the duplexer (DPX 1 ) whereas the send signal of the second modulation method is filtered by the filter (LPF 1 ).
  • a high-frequency circuit apparatus responsive to send and received signals of a first modulation method and a second modulation method having:
  • a duplexer for performing wave separation of a send signal and a received signal of the first modulation method and for performing separation of a received signal of the second modulation method;
  • a filter for filtering the send signal of the second modulation method.
  • SW 2 a second high-frequency switch for switching an input send signal between a transmission path of a first communication system of the TDMA method and a transmission path of a seventh communication system of the CDMA method;
  • a first low-pass filter LPF 1 for causing attenuation of an unnecessary signal from one send signal as switched by the second high-frequency switch
  • a first duplexer having a first port, a second port and a third port, for outputting to the second port a remaining send signal which is input from the first port and switched by the second high-frequency switch while applying thereto wave separation with a received signal different in frequency from the send signal and for outputting to the third port a received signal of the first communication system to be input from the second port and a received signal of the seventh communication system, which are in the same frequency band;
  • SW 1 for switching a received signal as input from an antenna terminal (ANT) to the second port of the first duplexer (DPX 1 ) and for switching to the antenna terminal both the send signal which is wave-separated by the first duplexer and is output from the second port and a send signal as output from the first low-pass filter (LPF 1 ).
  • FIG. 1 is a block diagram showing a one exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 1 of the present invention.
  • FIG. 2 is a block diagram showing an exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 2 of the invention.
  • FIG. 3 is a block diagram of an exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 3 of the invention.
  • FIG. 4 is a block diagram of an exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 4 of the invention.
  • FIG. 5 is a block diagram of an exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 5 of the invention.
  • FIG. 6 is a block diagram of an exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 6 of the invention.
  • FIG. 7 is a block diagram of an exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 7 of the invention.
  • FIG. 8 is a block diagram of an exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 8 of the invention.
  • FIG. 9 is a block diagram of an exemplary configuration of a high-frequency circuit apparatus in accordance with Embodiment 9 of the invention.
  • FIG. 10 is a block diagram showing one example of an internal configuration of a high-frequency circuit apparatus adaptable for use in a mobile telephone system in accordance with Embodiment 10 of the invention.
  • FIG. 11 is a block diagram of an exemplary configuration of a high-frequency circuit unit in known mobile phone systems.
  • TDMA time division multiple access
  • EGSM extended global system for mobile
  • DCS digital cellular system
  • GSM850 800 MHz-band global system for mobile communications 850
  • PCS personal communication services
  • WCDMA wideband code division multiple access
  • operating frequency is different depending upon regions using the same—for example, Band5 (B5) with a frequency band of 800 MHz, Band1 (B1) of a 2 GHz band, and Band2 (B2), which are mainly used in North America, Europe and Japan.
  • the mobile phone radiocommunication system employs a dual-band cellular phone using in combination the EGSM and DCS or a triple-band cellular phone with EGSM and DCS plus PCS combined together for providing enhanced usability in respective region.
  • a dual-mode mobile phone which combines together TDMA and WCDMA methods.
  • the dual-mode mobile phone is generally made up of an antenna module, an antenna resonator unit, a radio frequency integrated circuit (RFIC) unit, and a base-band unit. Due to co-existence of communication systems, circuit configuration becomes complicated with an increase in parts or components required therefor.
  • RFIC radio frequency integrated circuit
  • FIG. 11 is a block diagram of one exemplary high-frequency circuit unit which is used in a dual-mode mobile phone system having supportability to GSM850, EGSM and DCS of the TDMA method and also to B1, B2 and B5 of the WCDMA method.
  • This mobile phone system includes switches SW 1 and SW 2 which perform switching to either circuitry for the TDMA method or circuitry for WCDMA.
  • a circuit configuration is separated per communication method so that signal reception paths are different from each other. Accordingly, it becomes necessary to use a number of SAW filters or duplexers, which corresponds to the number of such different communication systems. This results in a likewise increase in total number of components in the entirety of the mobile phone system and an increase in manufacturing cost thereof.
  • FIG. 1 A high-frequency circuit apparatus in accordance with Embodiment 1 of this invention is shown in FIG. 1 in block diagram form.
  • This apparatus has functional supportability to different types of communications systems, e.g., GSM850 of TDMA method, and B5 of WCDMA method.
  • ANT is used to indicate an antenna terminal.
  • a high-frequency switch SW 1 switches a signal that is input from the antenna terminal ANT to a duplexer DPX 1 as will be described later and switches to a signal transmission side low-pass filter LPF 1 , which is connected to a high-frequency switch SW 2 to be later described.
  • the high-frequency switch SW 2 performs switching between signal transmission paths in a way depending upon a presently selected communication system. More specifically, the high-frequency switch SW 2 switches to either a transmission path of GSM850 or a transmission path of B5.
  • the duplexer DPX 1 performs the wave separation and selective routing of a frequency-different signal. In other words, letting an output signal of the high-frequency switch SW 1 pass through the duplexer DPX 1 results in removal of an unnecessary signal or signals, whereby a received signal having its frequency band of 869 MHz to 894 MHz which is an inbound signal band within the frequency band (824 MHz to 894 MHz) of GSM850 and a received signal with its frequency band of 869 MHz to 894 MHz which is an inbound signal band within the frequency band (824 MHz to 894 MHz) of B5 are output to a GSM850/B5 Rx terminal while causing an output signal of the high-frequency switch SW 2 to pass through the duplexer DPX 1 to thereby remove unnecessary signals therefrom for output to the switch SW 1 .
  • An example of the signal that is output from the high-frequency switch SW 2 and then input to the duplexer DPX 1 may be a signal of B5.
  • the received signal of WCDMA method and the received signal of TDMA method which are of the same frequency band, are made identical to each other in signal reception path or channel. This makes it possible to singularize the SAW filter or the duplexer, which has traditionally been required for each signal reception path.
  • the signal reception paths of the received signal of WCDMA method and the received signal of TDMA method can be made the same in this way because of the fact that an overlapping signal reception frequency band is present in respective methods. More specifically, in the WCDMA method, there are a plurality of signal bands of B1, B2 and B5; in the TDMA (GSM), there are a plurality of signal bands of PCS, DCS, EGSM and GSM850.
  • the illustrative embodiment is the one that utilizes the overlapping existence of the signal band of B5 of WCDMA method and the signal band of GSM850 of TDMA (GSM).
  • the following embodiments also are principally based on this concept.
  • FIG. 2 A high-frequency circuit apparatus in accordance with Embodiment 2 of the invention is depicted in FIG. 2 in block diagram form.
  • This apparatus offers supportability to different communication systems, one of which employs the TDMA technology—e.g., GSM850, DCS—and the other of which uses the WCDMA method, such as B5.
  • This embodiment is similar in circuit configuration to the first embodiment stated supra, except that the former employs a diplexer (DIP) between the antenna terminal ANT and the high-frequency switch SW 1 .
  • DIP diplexer
  • DIP is the diplexer that is connected to the antenna terminal ANT.
  • the diplexer DIP performs the wave separation of a signal having its frequency band of 824 MHz to 894 MHz of GSM850 as input from the antenna terminal ANT and a signal with a first frequency which is in a low frequency band including the signal of 824 MHz to 894 MHz band of B5 (Band 5) of WCDMA method and also a signal of a second frequency that is a high frequency band including the signal of 1710 MHz to 1880 MHz of DCS.
  • the diplexer DIP makes it possible to secure establishment of the channels for a plurality of frequency-different communication systems.
  • Use of the diplexer DIP at a post-stage of the antenna terminal ANT suppresses or prevents the signal of the first frequency, which is in the low frequency band, from attempting to leak into the signal path of the second frequency in the high frequency band. Furthermore, any unnecessary signals which are generated from the high-frequency switch SW 1 that is a nonlinear device are reduced by letting them pass through the diplexer DIP.
  • FIG. 3 A high-frequency circuit apparatus in accordance with a third embodiment of the invention is shown in FIG. 3 in block diagram form.
  • This apparatus has the supportability to a TDMA communication system, e.g., GSM850, DCS, and also to a WCDMA communication system, such as B5.
  • a TDMA communication system e.g., GSM850, DCS
  • WCDMA communication system such as B5.
  • This embodiment is similar in circuit arrangement to the second embodiment of the invention, except that the former uses, in a signal path of the second frequency as wave-separated by the diplexer DIP, a high-frequency switch SW 3 and a signal reception side surface acoustic wave (SAW) filter SAW 1 and also a low-pass filter LPF 2 , which will be described below.
  • SAW signal reception side surface acoustic wave
  • the high-frequency switch SW 3 switches a signal of the second frequency which is in the high frequency band as has been wave-separated by the diplexer DIP to the signal-receive side SAW filter SAW 1 that is connected to a DCS Rx terminal or, alternatively, switches to the diplexer DIP a sending signal which is output from the transmission side low-pass filter LPF 2 that is connected to a DCS Tx terminal.
  • FIG. 4 A high-frequency circuit apparatus in accordance with a fourth embodiment of this invention is illustrated in FIG. 4 .
  • the circuit apparatus as shown herein has the supportability to a TDMA communication system, e.g., GSM850, and also to a WCDMA communication system, such as B1 (Band1), B5.
  • a circuit configuration of this embodiment is similar to that of the second embodiment of the invention, except that the former uses a duplexer DPX 2 , to be later described, in the signal path of the second frequency including the frequency band of B1, which was wave-separated by the diplexer DIP.
  • the duplexer DPX 2 performs the wave separation of a frequency-different signal. More specifically, letting a signal of second frequency that was wave-separated by diplexer DIP to be later described pass through the duplexer DPX 2 results in removal of an unnecessary signal(s), whereby a received signal having its frequency of 2110 MHz to 2170 MHz which is an inbound signal frequency band within the frequency band (1920 MHz to 2170 MHz) of B1 is output to a B1 Rx terminal, while causing a send signal as input from a B1 Tx terminal to pass through the duplexer DPX 2 to thereby remove unnecessary signals therefrom for output to the diplexer DIP.
  • FIG. 5 A high-frequency circuit apparatus in accordance with a fifth embodiment of this invention is shown in FIG. 5 .
  • This apparatus has the supportability to a TDMA communication system, e.g., GSM850, PCS, and also to a WCDMA communication system, e.g., B2, B5.
  • a TDMA communication system e.g., GSM850, PCS
  • WCDMA communication system e.g., B2, B5.
  • This embodiment is similar in circuit configuration to the second embodiment of the invention, except that the former employs in PCS/B2 signal path a high-frequency switch SW 3 as will be described later, a duplexer DPX 3 to be later described, a low-pass filter LPF 2 , and a high-frequency switch SW 4 to be set forth later.
  • the duplexer DPX 3 performs the wave separation of a frequency-different signal. More specifically, a signal that is output from the high-frequency switch SW 3 as will be described later is guided to pass through the duplexer DPX 3 so that unnecessary signals are removed away therefrom, whereby a received signal having its frequency band of 1930 MHz to 1960 MHz that is an inbound signal band within the frequency band (1830 MHz to 1960 MHz) of B2 and a received signal with its frequency band of 1930 MHz to 1990 MHz that is an inbound signal frequency band within the frequency band (1850 MHz to 1990 MHz) of PCS are output to a PCS/B2 Rx terminal while an output signal of the high-frequency switch SW 4 passes through the duplexer DPX 3 so that unnecessary signals are removed therefrom for output to the high-frequency switch SW 3 .
  • the high-frequency switch SW 3 switches the signal of the second frequency that is in a high frequency band, which signal was wave-separated by the diplexer DIP, to the duplexer DPX 3 and switches to the diplexer DIP the send or outbound signal that is output from the low-pass filter LPF 2 .
  • the high-frequency switch SW 4 performs switching between signal transmission paths pursuant to a presently activated communication system. In other words, the high-frequency switch SW 4 switches a signal as input thereto to either the transmission path of PCS or the transfer path of B2 that is the WCDMA method.
  • FIG. 6 A high-frequency circuit apparatus in accordance with a sixth embodiment of this invention is shown in FIG. 6 .
  • This apparatus is operatively associated with an increased number of telecommunication systems when compared to Embodiment 5.
  • the illustrative circuit apparatus has the supportability to many different types of communication systems, such as GSM850, EGSM, DCS and PCS of the TDMA method and B1, B2 and B5 of the WCDMA technology.
  • the diplexer DIP performs the wave separation of a signal having its frequency band of 824 MHz to 894 MHz of GSM850 which is input from the antenna terminal ANT, a first frequency signal of low frequency band which contains therein a signal with its frequency band of 880 MHz to 960 MHz of EGSM and a signal with a frequency band of 824 MHz to 894 MHz of B5, a signal of a frequency band of 1710 MHz to 1880 MHz of DCS, a signal of a frequency band of 1850 MHz to 1990 MHz of PCS, and a second frequency signal of high frequency band which includes a signal with its frequency band of 1920 MHz to 2170 MHz of B1 and a signal of 1830 MHz-1960 MHz band of B2.
  • the high-frequency switch SW 2 performs the switching of a transmission path per communication system. More precisely, when transmitting an outbound signal of either GSM850 or EGSM of those send signals of GSM850, EGSM, B5 low-frequency band communication systems, which signals are input from a GSM850/EGSM/B5 terminal, the high-frequency switch SW 2 switches the outbound signal to the low-pass filter LPF 1 . When transmitting an outbound signal of B5 that is the WCDMA method, the switch SW 2 switches it to the duplexer DPX 1 .
  • the high-frequency switch SW 4 performs switching between transmission paths on a per-communication system basis. More precisely, the high-frequency switch SW 4 switches to the low-pass filter LPF 2 a send signal of DCS or PCS of those send signals of high-frequency band communication systems of DCS, PCS, B1 and B2, which signals are input from a DCS/PCS/B1/B2 terminal. This switch SW 4 also switches a send signal of B1 to the duplexer DPX 2 and switches a send signal of B2 to the duplexer DPX 3 .
  • the duplexer DPX 1 performs the wave separation of a frequency-different signal in such a way that an output signal of the high-frequency switch SW 1 passes through the duplexer DPX 1 so that unnecessary signals are removed away therefrom and then a received signal of B5 and a received signal of GSM850, which are of the same frequency band, are output together to a GSM850/B5 Rx terminal.
  • the duplexer DPX 3 performs wave separation of a frequency-different signal in a way such that an output signal of the high-frequency switch SW 3 is guided to pass through the duplexer DPX 3 so that unnecessary signals are removed therefrom and then a received signal of B2 having a frequency of 1930 MHz to 1960 MHz and a received signal of PCS with its frequency of 1930 MHz to 1990 MHz, which are in the same frequency band, are output to a PCS/B2 Rx terminal.
  • the duplexer DPX 2 performs the wave separation of a frequency-different signal in a way such that an output signal of the high-frequency switch SW 3 passes through the duplexer DPX 3 so that unnecessary signals are removed away therefrom whereby the resultant signal is output to a B1 Rx terminal.
  • the high-frequency switch SW 1 switches the first frequency signal of low frequency band which was wave-separated by the diplexer DIP to either the duplexer DPX 1 or the signal-receive side SAW filter SAW 2 that is connected to an EGSM Rx terminal, and switches to the diplexer DIP a send signal which is output from the transmission side low-pass filter LPF 1 that is connected to the switch SW 2 .
  • the high-frequency switch SW 3 switches a signal of the second frequency of high frequency band which was wave-separated by the diplexer DIP to any one of the duplexer DPX 2 and the duplexer DPX 3 and the signal-receive side SAW filter SAW 1 that is connected to the B1 Rx terminal while switching to the diplexer DIP a send signal which is output from the transmission side low-pass filter LPF 2 that is connected to the switch SW 4 stated supra.
  • FIG. 7 A high-frequency circuit apparatus in accordance with a seventh embodiment of the invention is shown in FIG. 7 .
  • This apparatus is similar to that of the sixth embodiment except that the diplexer DIP at the post-stage of the antenna terminal ANT and the high-frequency switches SW 1 and SW 2 are deleted, and a switch SW 5 which operates to switch between signal-sending/receiving paths is provided for selective connection to the antenna terminal ANT, duplexer DPX 1 , signal receive side SAW filter SAW 2 , low-pass filter LPF 1 , signal receive side SAW filter SAW 1 , low-pass filter LPF 2 , duplexer DPX 3 and duplexer DPX 2 .
  • FIG. 8 A high-frequency circuit apparatus in accordance with an eighth embodiment of the invention is depicted in FIG. 8 in block diagram form.
  • This circuit apparatus is similar to that of Embodiment 6 with the duplexers DPX 1 -DPX 3 and signal-receive side SAW filters SAW 1 - 2 being modified so that an output terminal of each is a single output. With such an arrangement, the output terminals required decrease in number, resulting in the circuit configuration becoming simplified.
  • FIG. 9 A high-frequency circuit apparatus in accordance with a ninth embodiment of the invention is shown in FIG. 9 .
  • This apparatus has several matching circuits for taking matching with external circuitry, i.e., a matching circuit # 1 which is connected between the duplexer DPX 1 and GSM850/B5 Rx terminal, a matching circuit # 2 that is coupled between the signal receive side SAW filter SAW 2 and EGSM Rx terminal, a matching circuit # 3 between the signal receive side SAW filter SAW 1 and DCS Rx terminal, a matching circuit # 4 between the duplexer DPX 3 and PCS/B2 Rx terminal, and a matching circuit # 5 between the duplexer DPX 2 and B1 Rx terminal.
  • Each matching circuit is made up of more than one inductor and more than one capacitor. Letting the inductor and capacitor be small in inductance and capacitance thereof makes it possible to embed the matching circuits in a multilayered circuit board or substrate.
  • FIG. 10 A mobile cellular phone telecommunications system is shown in FIG. 10 , which has multiple functionalities, such as over-the-air voice communications, data communications, local area network (LAN) connectivity and others.
  • This system includes a high-frequency circuit apparatus, which is any one of Embodiments 1 to 9, and a built-in SAW filter or duplexer that is disposed between an antenna and an RFIC.
  • a receiver unit receives an inbound signal which is received by the antenna. This received signal is input to the high-frequency circuit apparatus. A signal processed by this apparatus is then input to a baseband unit via the RFIC. A signal as processed thereby is output from an output unit, such as a voice/audio output unit, data output unit or interface (I/F) unit. A transmitter unit permits an outbound signal that is output from the baseband unit to pass through the high-frequency circuit apparatus via the RFIC and/or a high-power amplifier (PHA) for output from the antenna.
  • PPA high-power amplifier
  • CMOS complementary metal oxide semiconductor
  • HEMT high electron mobility transistor
  • MEMS micro-electromechanical systems
  • Embodiments 1 to 10 which offer the supportability to a combination of TDMA communication systems of GSM850, EGSM, DCS and PCS and WCDMA communication systems of B1, B2 and B5 by way of example, this invention should not be limited thereto. Similar results are obtainable in high-frequency circuit apparatuses with a combination of a plurality of systems, such as a personal digital cellular (PDC) access method and WCDMA, WCDMA and narrow-band CDMA, etc., in case inbound signals received are substantially substantially the same in frequency band as each other.
  • PDC personal digital cellular
  • the high-frequency circuit apparatus in accordance with any one of the above-stated embodiments is utilizable for mobile telephones with the co-existence of various types of telecommunications systems, including but not limited to TDMA, CDMA and WCDMA technologies.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Transceivers (AREA)
  • Time-Division Multiplex Systems (AREA)
US11/478,849 2006-02-08 2006-07-03 High-frequency circuit apparatus and communication apparatus using the same Abandoned US20070183348A1 (en)

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US11/976,955 US7570622B2 (en) 2006-02-08 2007-10-30 High-frequency circuit apparatus and communication apparatus using the same
US11/976,954 US7760691B2 (en) 2006-02-08 2007-10-30 High-frequency circuit apparatus and communication apparatus using the same
US11/976,956 US20080137560A1 (en) 2006-02-08 2007-10-30 High-frequency circuit apparatus and communication apparatus using the same

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JP2006030418A JP4637026B2 (ja) 2006-02-08 2006-02-08 高周波回路装置及びこれを搭載した通信装置。
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US11/976,955 Expired - Fee Related US7570622B2 (en) 2006-02-08 2007-10-30 High-frequency circuit apparatus and communication apparatus using the same
US11/976,956 Abandoned US20080137560A1 (en) 2006-02-08 2007-10-30 High-frequency circuit apparatus and communication apparatus using the same
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US11/976,954 Expired - Fee Related US7760691B2 (en) 2006-02-08 2007-10-30 High-frequency circuit apparatus and communication apparatus using the same

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Cited By (8)

* Cited by examiner, † Cited by third party
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US20080068109A1 (en) * 2006-07-07 2008-03-20 Edgar Schmidhammer Transceiver circuit
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US20080068109A1 (en) * 2006-07-07 2008-03-20 Edgar Schmidhammer Transceiver circuit
US20100254366A1 (en) * 2007-05-23 2010-10-07 Comba Telecom System (China) Ltd. DCS/WCDMA Dual Frequency Synthesizer And A General Dual Frequency Synthesizer
US8680943B2 (en) * 2007-05-23 2014-03-25 Comba Telecom System (China) Ltd. DCS/WCDMA dual frequency synthesizer and a general dual frequency synthesizer
US8804579B2 (en) * 2008-02-25 2014-08-12 Nxp B.V. Methods, systems and devices for wireless devices having multiple wireless modules
US20100309825A1 (en) * 2008-02-25 2010-12-09 Nxp B.V. Methods, systems and devices for wireless devices having multiple wireless modules
US8879439B2 (en) * 2009-09-21 2014-11-04 Cambridge Silicon Radio Limited Multiplexer
US20110069645A1 (en) * 2009-09-21 2011-03-24 Cambridge Silicon Radio Limited Multiplexer
US9287850B2 (en) 2011-08-22 2016-03-15 Taiyo Yuden Co., Ltd. Communication module comprised of multiple interdigital transducer duplexers for wireless communication unit
US11387851B2 (en) * 2020-03-13 2022-07-12 Murata Manufacturing Co., Ltd. Radio frequency module and communication device
US11394407B2 (en) * 2020-03-27 2022-07-19 Murata Manufacturing Co., Ltd. Radio frequency module and communication device
US11394406B2 (en) * 2020-03-27 2022-07-19 Murata Manufacturing Co., Ltd. Radio frequency module and communication device
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CN101018068A (zh) 2007-08-15
JP4637026B2 (ja) 2011-02-23
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US20080070514A1 (en) 2008-03-20
US7570622B2 (en) 2009-08-04

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