WO2013063923A1 - Radio frequency front-end module, multimode terminal, and signal sending method of the multimode terminal - Google Patents

Abstract

A radio frequency front-end module, a multimode terminal, and a signal sending method of the multimode terminal. The radio frequency front-end module comprises a control module, and a power amplifier and a switch circuit that are connected to the control module. The control module is configured to send, according to a control signal from a baseband chip, a working mode indication signal to the power amplifier, and a switch indication signal to the switch circuit; the power amplifier is configured to, under the work mode indicated by the work mode indication signal sent by the control module, amplify an input time division access signal and output the amplified signal to the switch circuit; the switch circuit is configured to switch the time division access signal output by the power amplifier to a public passageway according to the switch indication signal sent by the control module. Compared with the existing dual-mode terminal, the dual-mode terminal with the above architecture has the following advantages: at least one chip is reduced and the circuit connection is greatly simplified, which is meaningful for the development of miniaturization of dual-mode terminals.

Description

 Method for transmitting signals by RF front-end module, multi-mode terminal and multi-mode terminal

Technical field

 The present invention relates to mobile communication technologies, and in particular, to a method for transmitting signals by a radio frequency front end module, a multimode terminal, and a multimode terminal. BACKGROUND OF THE INVENTION Currently, there are many different wireless communication systems in the field of telecommunications, and their respective communication standards are respectively adopted, and different working frequencies and working modes are different under different communication standards, such as second generation communication which has been widely used all over the world. The standard Global System for Mobile Communication (GSM), and the third-generation communication standard Wideband Code Division Multiple Access (WCDMA) system being promoted worldwide. In order for the terminal to be used worldwide, it must support a variety of different communication standards. Currently, the most commonly used terminals support both GSM and WCDMA.

 Currently, in the architecture scheme of the WCDMA/GSM dual-mode mobile phone, a common implementation method is as shown in FIG. 1. The baseband chip 100, the radio frequency front end circuit 200, the WCDMA/GSM radio frequency transceiver 300, the GSM power amplifier 310, and the WCDMA are required. A power amplifier 410, at least one GSM receive filter (RX SAW) 320 and at least one WCDMA duplexer 420.

 All of the above architecture schemes require the use of more than seven chips, which complicates the circuit structure and occupies a large amount of printed circuit board (PCB) area, which is not conducive to cost reduction, and is not conducive to miniaturization of the terminal. Summary of the invention

 The embodiment of the invention provides a method for transmitting signals by a radio frequency front-end module, a multi-mode terminal and a multi-mode terminal, so as to solve the problem that the existing multi-mode terminal occupies a large PCB area.

The embodiment of the present invention provides a radio frequency front end module, which is applied to a multimode terminal, where the radio frequency front end module includes a control module and a power amplifier and a switch circuit connected to the control module, where: The control module is configured to: send an operation mode indication signal to the power amplifier according to a control signal from the baseband chip and send a switching indication signal to the switch circuit; the power amplifier is set to: work sent by the control module In the working mode indicated by the mode indication signal, the input time division access signal is amplified and output to the switch circuit; the switch circuit is configured to: output the power amplifier according to a switching instruction signal sent by the control module The time division access signal is switched to the common path.

 Preferably, the switch circuit is further configured to: switch the code division access signal of the common path to the corresponding transceiver path according to the switching indication signal sent by the control module.

 Preferably, the radio frequency front end module further includes:

 The filtering module is configured to: connect to the switch circuit, receive a time division access signal sent by the switch circuit, filter the time division access signal, and output the signal.

 Preferably, the time division access signal is a Global System for Mobile Communications (GSM) signal, a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) signal or a Personal Handyphone System (PHS) signal; Wideband Code Division Multiple Access (WCDMA) signals or Code Division Multiple Access (CDMA) signals.

 Embodiments of the present invention provide a multimode terminal, including a baseband chip, a radio frequency transceiver, and a radio frequency front end module, which are sequentially connected, where:

 The radio frequency front end module uses the above radio frequency front end module.

 Preferably, the multimode terminal further includes a time division access signal filter connected to the radio frequency front end module, and the time division access signal filter is located in the radio frequency transceiver.

 An embodiment of the present invention provides a multimode terminal, including a baseband chip, a radio frequency transceiver, and a radio frequency front end module, which are sequentially connected, wherein

 The radio frequency front end module uses the above radio frequency front end module.

 An embodiment of the present invention provides a method for transmitting a signal by a multimode terminal, where the method includes: receiving, by a radio frequency front end module, a control signal sent by a baseband chip;

 The RF front-end module amplifies and inputs the input time-division input signal in an operation mode indicated by the control signal.

Preferably, the method further includes: The radio frequency front end module filters and receives the received time division access signal. Preferably, the time division access signal is a Global System for Mobile Communications (GSM) signal, a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) signal or a Personal Handyphone System (PHS) signal.

 The dual-mode terminal of the above architecture reduces at least one chip compared with the existing dual-mode terminal, and the circuit connection is greatly simplified, which makes sense for the miniaturization of the dual-mode terminal. BRIEF abstract

 FIG. 1 is a schematic diagram of an existing WCDMA/GSM dual mode mobile phone architecture;

 2 is a schematic structural diagram of an embodiment of a radio frequency front end module according to the present invention;

 3 is a schematic structural diagram of Embodiment 1 of a dual mode terminal according to the present invention;

 4 is a schematic structural diagram of Embodiment 2 of a dual mode terminal according to the present invention. Preferred embodiment of the invention

 In order to make the objects, the technical solutions and the advantages of the present invention more clearly, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments of the present application may be arbitrarily combined with each other.

 2 is a schematic structural diagram of an embodiment of a radio frequency front end module according to the present invention. The radio frequency front end module includes a control module and a power amplifier and a switch circuit connected to the control module, where: the control module is configured to a control signal of the baseband chip transmits an operation mode indication signal to the power amplifier and a switching indication signal to the switch circuit;

 The power amplifier is configured to: when the working mode indication signal sent by the control module is in an operation mode, the input time division access signal is amplified and output to the switch circuit;

 The switch circuit is configured to switch the time division access signal output by the power amplifier to a common path according to a switching indication signal sent by the control module.

In addition, the switch circuit is further configured to switch the code division access signal of the common path to the corresponding transceiver path according to the handover indication signal sent by the control module. For example, the WCDMA signal is switched to the TRX1 path. That is, the power of at least one path of the antenna switch integrated by the above RF front-end module The capacity meets the requirements of WCDMA signals.

 The switch circuit is further configured to switch the time division access signal of the common path to the corresponding receiving path according to the switching indication signal sent by the control module, for example, to switch the received signal of the GSM to the RX1 path.

 The time division access signal may be a Global System for Mobile Communications (GSM) signal, a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) signal or a Personal Handyphone System (PHS) signal; the above code division access signal may be a broadband code division Multiple Access (WCDMA) signals or Code Division Multiple Access (CDMA) signals.

As shown in FIG. 3, it is a schematic structural diagram of Embodiment 1 of a dual mode terminal according to the present invention. The dual mode terminal includes the following six parts: a baseband chip 100, a dual mode RF transceiver 300, a WCDMA power amplifier 410, and a WCDMA duplexer 420. The GSM receives the SAW (GSM RX SAW) 320 and the RF front end module 201 shown in FIG.

 The GSM receiving SAW described above can also be integrated into the dual mode RF transceiver 300.

 The above dual-mode RF transceiver performs transmission and reception processing of WCDMA and GSM signals. The WCDMA power amplifier completes the linear amplification of WCDMA, and the WCDMA duplexer completes the duplex transmission and reception of the WCDMA signal. The RF front-end module integrates an antenna switch and a GSM power amplifier. The GSM power amplifier module of the RF front end completes the amplification of the GSM signal; the switching circuit not only completes the transmission of the GSM transceiving signal, but also completes the transmission of the WCDMA bidirectional signal, wherein the WCDMA transmission signal is a high power signal, which is compatible with the existing commonly used radio frequency front end. In comparison, the power capacity of the at least one path of the antenna switch integrated with the RF front end of the present invention satisfies the requirements of the WCDMA signal.

 In the receiving link of the dual-mode terminal of the above architecture, the electromagnetic wave signal enters the switching circuit in the RF front-end module 201 through the common path through the common path, and under the control of the baseband chip 100, the switching circuit selects the corresponding receiving communication network, and the RF signal is The receiving loop that is sent to the corresponding frequency band. The filtered RF signal enters the dual mode RF transceiver 300. The dual-mode radio frequency transceiver 300 uses a zero-IF receiving scheme to directly convert the received RF signal to a baseband I/Q signal, and sends it to the baseband chip 100, and performs demodulation and decoding processing by the baseband chip 100. The original signal.

In the transmitting link of the dual-mode terminal of the above architecture, the baseband chip 100 performs the encoding, modulation, and the like processing of the original signal, and obtains the I/Q signal of the GSM or WCDMA, and sends the dual-mode radio frequency transceiver. In the transmitter 300, the transmitting portion of the dual-mode radio frequency transceiver 300 uses a directly-converted up-conversion scheme to perform a change processing on the input I/Q signal to obtain a radio-frequency modulated signal. The GSM radio frequency modulated signal enters the power amplifying module of the radio frequency front end module 201 (the GSM power amplifying module in this embodiment); meanwhile, the baseband chip sends out the control signal, so that the GSM power amplifying module in the radio frequency front end module 201 is in a saturated working state, and the power is amplified. The post-RF signal is sent to the switching circuit in the RF front-end module 201. The switching circuit is controlled by the baseband chip 100 to select the GSM transmission path, and the RF signal is sent to the main antenna of the mobile phone through the common path; the WCDMA RF modulation signal enters the WCDMA power. At the same time, the baseband chip sends a control signal to make the WCDMA power amplifier 410 in a linear working state, and the power amplified RF signal is sent to the switching circuit in the RF front end module 201 after passing through the 420 in the WCDMA duplexer, and the switching circuit is subjected to The control of the baseband chip 100 selects the WCDMA path and sends the RF signal to the main antenna of the mobile phone through the common path.

 In the above embodiment, the WCDMA power amplifier 410 and the WCDMA duplexer 420 are not limited to two independent devices, and can be integrated into one functional module as needed.

 The dual mode architecture in the above embodiment is not limited to WCDMA/GSM dual mode, and may also be CDMA/GSM dual mode. The GSM part is not limited to the GSM standard, and may be a time division access mode such as TD-SCDMA or Personal Handyphone System (PHS); the WCDMA part is not limited to the WCDMA standard, and may be a code division access mode of CDMA or the like.

 The dual-mode terminal of the above architecture reduces one chip compared with the existing dual-mode terminal, and the circuit connection is greatly simplified, which is meaningful for the miniaturization of the dual-mode terminal.

Further, the radio frequency front end module shown in FIG. 2 may further include: a filtering module, connected to the switch circuit, configured to receive a time division access signal sent by the switch circuit, and filter the time division access signal to output; The dual mode terminal including the above-mentioned structure RF front end module is shown in FIG. 4, and the terminal includes the following five parts: a baseband chip 100, a dual mode radio frequency transceiver 300, a WCDMA power amplifier 410, a WCDMA duplexer 420, and a radio frequency front end module 202. .

 The difference between this embodiment and the embodiment shown in Fig. 3 is that the filtering module of the GSM system is integrated in the radio frequency front end module 202.

In the receiving link of the dual-mode mobile phone architecture of the above embodiment, the electromagnetic wave signal is passed through the antenna. Using the path to enter the antenna switch in the RF front-end module 202, under the control of the baseband chip 100, the antenna switch selects the corresponding receiving path, and directly sends the GSM RF signal back to the dual-mode RF transceiver 300; the WCDMA signal is sent to the WCDMA duplex. The 420 is filtered and sent back to the dual mode RF transceiver 300. The dual-mode radio frequency transceiver 300 uses a zero-IF receiving scheme to directly convert the received RF signal to a baseband I/Q signal, and sends it to the baseband chip 100, and performs demodulation, decoding, etc. processing by the baseband chip 100. The original signal.

 In the transmitting link of the dual-mode mobile phone architecture of the foregoing embodiment, the baseband chip 100 performs the encoding, modulation, and the like processing of the original signal, and obtains the I/Q signal of the GSM or WCDMA, and sends the I/Q signal to the dual-mode RF transceiver 300. The transmitting portion of the analog RF transceiver 300 uses a directly transformed upconversion scheme to perform a change processing on the input I/Q signal to obtain a radio frequency modulated signal. The GSM radio frequency modulation signal enters the GSM power amplification module of the RF front end module 202. At the same time, the baseband chip sends out the control signal, so that the GSM power amplification module of the RF front end module 202 is in a saturated working state, and the power amplified RF signal is sent to the antenna switch in the RF front end module 202, and the antenna switch is controlled by the baseband chip 100. The GSM transmission path sends the RF signal to the main antenna of the mobile phone through the common channel; the WCDMA RF modulation signal enters the WCDMA power amplifier 410, and the baseband chip sends the control signal to make the WCDMA power amplifier 410 in a linear working state, after power amplification The RF signal is sent to the antenna switch in the RF front-end module 202 after passing through the 420 in the WCDMA duplexer. The antenna switch is controlled by the baseband chip 100, selects the WCDMA channel, and sends the RF signal to the main antenna of the mobile phone through the common path.

 In the above embodiment, the WCDMA power amplifier 410 and the WCDMA duplexer 420 are not limited to two independent devices, and can be integrated into one functional module as needed.

 The dual mode architecture in the embodiment of the present invention is not limited to WCDMA/GSM dual mode, and may also be CDMA/GSM dual mode. The GSM part is not limited to the GSM standard, and may be a time division access mode such as TD-SCDMA or Personal Handyphone System (PHS); the WCDMA part is not limited to the WCDMA standard, and may be a code division access mode of CDMA or the like.

 The dual-mode terminal of the above architecture reduces two chips compared with the existing dual-mode terminal, and the circuit connection is greatly simplified, which is meaningful for the miniaturization of the dual-mode terminal.

One of ordinary skill in the art will appreciate that all or part of the steps in the above methods may be passed through the program. To complete the instruction related hardware, the above program may be stored in a computer readable storage medium such as a read only memory, a magnetic disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

 The above embodiments are only intended to illustrate the technical solutions of the present invention and are not to be construed as limiting the invention. It should be understood by those skilled in the art that the present invention may be modified or equivalently substituted without departing from the spirit and scope of the invention.

Industrial applicability

 The dual-mode terminal of the above architecture reduces at least one chip compared with the existing dual-mode terminal, and the circuit connection is greatly simplified, which makes sense for the miniaturization of the dual-mode terminal.

Claims

Claim  An RF front-end module for a multi-mode terminal, the RF front-end module comprising a control module and a power amplifier and a switch circuit connected to the control module, wherein:  The control module is configured to: send an operation mode indication signal to the power amplifier according to a control signal from the baseband chip, and send a switching indication signal to the switch circuit;  The power amplifier is configured to: when the working mode indication signal sent by the control module is in an operation mode, the input time division access signal is amplified and output to the switch circuit; the switch circuit is set as: The switching indication signal sent by the control module switches the time division access signal output by the power amplifier to a common path.  2. The radio frequency front end module according to claim 1, wherein  The switch circuit is further configured to: switch the code division access signal of the public path to the corresponding transceiver path according to the switching indication signal sent by the control module.  3. The radio frequency front end module according to claim 2, wherein the radio frequency front end module further comprises:  The filtering module is configured to: connect to the switch circuit, receive a time division access signal sent by the switch circuit, filter the time division access signal, and output the signal.  4. The radio frequency front end module according to claim 3, wherein  The time division access signal is a Global System for Mobile Communications (GSM) signal, a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) signal or a Personal Handyphone System (PHS) signal;  The code division access signal is a Wideband Code Division Multiple Access (WCDMA) signal or a Code Division Multiple Access (CDMA) signal.  5. A multimode terminal comprising a baseband chip, a radio frequency transceiver, and an RF front end module, which are sequentially connected, wherein  The radio frequency front end module uses the radio frequency front end module according to claim 1 or 2 or 4. The multimode terminal according to claim 5, wherein the multimode terminal further comprises a time division access signal filter connected to the radio frequency front end module, where The time division access signal filter is located in the radio frequency transceiver. 7. A multimode terminal comprising a baseband chip, a radio frequency transceiver, and an RF front end module, which are sequentially connected, wherein  The radio frequency front end module uses the radio frequency front end module according to claim 3 or 4. 8. A method of transmitting a signal by a multimode terminal, the method comprising:  The RF front end module receives the control signal sent by the baseband chip;  The RF front-end module amplifies and inputs the input time-division input signal in an operation mode indicated by the control signal.  9. The method according to claim 8, wherein the method further comprises:  The radio frequency front end module filters and receives the received time division access signal.  10. The method according to claim 8 or 9, wherein  The time division access signal is a Global System for Mobile Communications (GSM) signal, a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) signal, or a Personal Handyphone System (PHS) signal.