WO2012079309A1

WO2012079309A1 - Quad-band global system for mobile communicaiton (gsm) transceiving device and wireless terminal

Info

Publication number: WO2012079309A1
Application number: PCT/CN2011/071463
Authority: WO
Inventors: 于娟; 葛虎
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-12-17
Filing date: 2011-03-02
Publication date: 2012-06-21
Also published as: CN201976093U

Abstract

The present utility model discloses a quad-band Global System for Mobile communication (GSM) transceiving device and a wireless terminal. The GSM transceiving device includes an antenna, wherein the transceiving device also includes: a dual-band antenna switch respectively connected with the antenna and two radio frequency integrated devices; the two radio frequency integrated devices whose input ends are respectively connected with two receiving band channels which the dual-band antenna switch corresponds to, wherein each radio frequency integrated device is a device in which a single-pole double-throw switch and a filter corresponding to two bands are integrated; a radio frequency transceiving chip with two receiving channels, wherein each receiving channel is respectively connected with output ends of a radio frequency integrated device. The technical solution provided by the present utility model can reduce the difficulties of wiring layout, lower the hardware cost of the quad-band GSM solution greatly.

Description

TECHNICAL FIELD The present invention relates to communication or, in particular, to a quad-band global mobile communication.

(Global system for Mobile Communication, abbreviated as GSM) Transceiver and wireless terminal. BACKGROUND OF THE INVENTION Due to the popularity of terminal products such as GSM mobile phones and the advantages of low cost, the market share is relatively high. Currently, the relatively low-end mobile phones are basically GSM dual-band mobile phones, which is due to the current design of GSM quad-band mobile phones. Higher cost. Currently, a quad-band GSM mobile phone requires a single-pole six-four Zheng antenna switch, a quad-band transmit function and port RF power amplifier (PA), and a surface acoustic wave (SAW) filter in each of the four frequency bands. Finally, the four receiving channels can be seen in Figure 1 and Figure 2. FIG. 1 is a structural diagram of hardware design of a four-band transmitter and receiver in the related art. FIG. 2 is a diagram showing the relationship between the general four-band transmission and receiver logic control configuration shown in FIG. 1. As can be seen from Figure 2, the transmitter has two transmit lines and four receive lines, so that the antenna switch is a single-pole six-throw, and there are six states required, that is, the antenna switch has six logic states. And the receiver also needs four sets of differential pairs to complete the reception of four frequency bands. Therefore, it can be concluded that according to the scheme of Figure 1, the antenna switch will have many states, and the transmitter and receiver will have many pins, which will not only increase the cost of the transmitter and receiver hardware, but also because Many pins and traces that are transmitted and received cause difficulty in layout routing. The utility model provides a quad-band GSM transceiver and a wireless terminal, and the utility model provides a quad-band GSM transmitter and receiver with a large number of pins, which causes difficulty in layout routing and an increase in hardware cost. Solve at least one of the above problems. According to an aspect of the present invention, a four-band GSM transceiver is provided. The quad-band GSM transceiver according to the present invention includes: an antenna, the transceiver further includes: a dual-frequency antenna switch, respectively connected to the antenna and two RF integrated devices; two RF integrated devices, the input ends of which are respectively connected in the double The two antenna receiving channels corresponding to the frequency antenna switch, wherein each of the RF integrated devices is a device integrating a single-pole double-throw switch and a filter corresponding to two frequency bands; and an RF transceiver chip having two receiving channels, wherein Each receive channel is coupled to an output of a radio frequency integrated device. The above RF integrated device comprises: a single pole double throw switch connected to a receiving frequency band channel corresponding to the dual frequency antenna switch; a first single frequency surface acoustic wave (SAW) filter, the input end thereof and the single pole double throw switch One end is connected; the second single-band SAW filter has an input end connected to the second end of the single-pole double 4 Zheng switch. The above RF integrated device comprises: a single pole double throw switch connected to a receiving band channel corresponding to the dual frequency antenna switch; a dual band SAW filter whose input end is connected with the single pole double throw switch. The filter corresponding to the two frequency bands in one RF integrated device is a high frequency band filter, wherein the frequency band corresponding to the high frequency band filter is higher than a predetermined threshold; and the filter corresponding to the two frequency bands in the other RF integrated device is a low frequency band a filter, wherein a frequency band corresponding to the low frequency band filter is lower than a predetermined threshold. The radio frequency transceiver chip includes: a low frequency LNA and a high frequency LNA; the high frequency band filter is connected to the high frequency LNA through a receiving channel of the radio frequency transceiver chip; the low band filter is connected to the low frequency LNA through another receiving channel of the radio frequency transceiver chip. . The frequency bands corresponding to the above high frequency band filter are GSM 1800 frequency band and GSM 1900 frequency band; the frequency bands corresponding to the low frequency band filter are GSM 850 frequency band and GSM 900 frequency band. The transceiver device further includes: a radio frequency power amplifier located on a transmitting channel between the dual-frequency antenna switch and the radio frequency transceiver chip; the dual-frequency antenna switch and the radio frequency power amplifier are integrated in one radio frequency transmitting module. The above antenna is a passive device having a four-frequency transceiving function. According to another aspect of the present invention, the present invention also provides a wireless terminal. The wireless terminal according to the present invention includes any of the aforementioned four-band GSM transceivers. Through the utility model, the GSM quad-band scheme is implemented by selecting a suitable SAW filter by using a dual-frequency antenna switch and a radio frequency integrated device, and the pins of the quad-band GSM transmitter and the receiver in the related art are solved, which leads to layout routing. Difficulties and increased hardware costs can further reduce the difficulty of layout routing and maximize the hardware cost of the quad-band GSM solution. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate, FIG. Improperly qualified. In the drawings: FIG. 1 is a hardware design architecture diagram of a four-band transmission and receiver in the related art; FIG. 2 is a diagram showing a relationship between a four-band transmission and receiver logic control configuration shown in FIG. 1; FIG. 4 is a schematic structural diagram of a radio frequency integrated device integrated with a high frequency band filter according to a preferred embodiment of the present invention; FIG. 5 is a schematic structural diagram of a radio frequency integrated device integrated with a high frequency band filter according to a preferred embodiment of the present invention; FIG. 6 is a schematic diagram of a logical control configuration of a quad-band GSM transceiver according to a preferred embodiment of the present invention. FIG. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. According to an embodiment of the present invention, a four-band GSM transceiver is provided. 3 is a hardware design architecture diagram of a four-band GSM transceiver device according to an embodiment of the present invention. As shown in FIG. 3, the four-band GSM transceiver includes, in addition to the antenna 1, a dual-frequency antenna switch 3, two radio frequency integrated devices 4 and 5, and a radio frequency transceiver chip 6 having two receiving channels. among them, The dual-frequency antenna switch 3 is respectively connected to the antenna 1 and the two RF integrated devices 4 and 5, wherein each of the RF integrated devices is a device integrating a single-pole double-throw switch and a filter corresponding to two frequency bands; The RF integrated devices 4 and 5 have their input terminals respectively connected to the two receiving frequency band channels corresponding to the dual frequency antenna switch; the RF transceiver chip 6 having two receiving channels, wherein each receiving channel is respectively associated with a radio frequency integrated device The outputs are connected. In the above device, a dual-frequency antenna switch (for example, a single-pole four-throw switch) and two single-pole double-throw switches are used to select a suitable filter to implement a GSM quad-band scheme, and the related art has been solved in the related art. There are many pins on the receiver, which leads to difficulties in layout routing and increased hardware cost, which can reduce the difficulty of layout routing and minimize the hardware cost of the quad-band GSM solution. The antenna may be a passive device with a quad-frequency transceiver function. The above-mentioned four-band GSM transceiver device may further include: a radio frequency power amplifier located on a transmission channel between the dual-frequency antenna switch 3 and the radio frequency transceiver chip 2, in the specific implementation process, the dual-frequency antenna switch 3 and the radio frequency power amplifier 2 can be integrated into one RF transmitter module, or it can be laid out independently. Preferably, the components integrated in the radio frequency integrated device include but are not limited to: a single pole double throw switch connected to a receiving frequency band channel corresponding to the dual frequency antenna switch; the first single frequency band SAW filter, the input end thereof and the single knife The first end of the double throw switch is connected; the second single frequency SAW filter has an input end connected to the second end of the single pole double throw switch. Preferably, the components integrated in the radio frequency integrated device include but are not limited to: a single pole double throw switch connected to a receiving band channel corresponding to the dual frequency antenna switch; a dual band SAW filter, the input end and the single pole double The throw switch is connected. The above two integration methods of the RF integrated device are provided. In the specific implementation process, a single-pole double-throw switch and two single-band SAW filters can usually be integrated into the above RF integrated device. It is also possible to integrate a single pole double throw switch and a dual band SAW filter into the above RF integrated device. The switching of the single-pole double-throw switch allows the filter to switch between the two bands. Preferably, the two frequency bands described above may be set to one of the high frequency bands and the other to the low frequency bands. That is, the filter corresponding to the two frequency bands in one of the two radio frequency integrated devices may be set as a high frequency band filter, wherein the frequency band corresponding to the high frequency band filter is higher than a predetermined threshold; the above two radio frequency integration The filter corresponding to the two frequency bands in another RF integrated device in the device may be a low band filter, wherein the frequency band corresponding to the low band filter is lower than a predetermined threshold. The frequency bands corresponding to the high-band filter are usually GSM 1800 band and GSM 1900 band. For details, see Figure 4. The frequency bands corresponding to the above-mentioned band filter are usually GSM 850 band and GSM 900 band, as shown in FIG. 5 . Figure 4 depicts the RF integrated device with the high-band filter integrated as shown in Figure 3. The device integrates a dual-frequency SAW filter with switch selection. The device consists of a single-pole, double-throw switch.

The GSM1800/GSM1900 two-band common SAW filter chip and the matching circuit with its differential output are composed of three parts, and the electrical characteristics should also meet the previous basic frequency response limit requirements. Figure 5 depicts the RF integrated device with integrated low-band filter as shown in Figure 3. The dual-frequency SAW filter with switch is selected by a single-pole, double-throw switch, GSM850/GSM900 for two-band common SAW filtering. The chip and the matching circuit combining its differential output are composed of three parts, and the electrical characteristics should meet the requirements of the previous basic frequency response. Preferably, the radio frequency transceiver chip includes, but is not limited to: a low frequency LNA and a high frequency LNA; wherein the high frequency band filter can be connected to the high frequency LNA through a receiving channel of the radio frequency transceiver chip; the low frequency band filter passes the radio frequency transceiver chip. The other receiving channel is connected to the low frequency LNA. In the preferred implementation process, a single-pole double-throw switch can be added to the frequency-frequency receiving channel to select GSM850 and GSM900 to enter different SAW filters, and their differential output channels are combined and then enter the RF transceiver chip low-frequency LNA. One-step processing; a single-pole double-throw switch is also added to the high-frequency receiving channel, and GSM1800 and GSM1900 are selected to enter different SAW filters. Their differential output channels are combined and then enter the RF transceiver chip high-frequency LNA for further processing. . The above preferred embodiment is described below in conjunction with the example of FIG. 6. 6 is a logic control configuration diagram of a four-band GSM transceiver according to an example of the present invention. As shown in FIG. 6, the four-band GSM transceiver includes, in addition to the antenna 1 and the radio frequency power amplifier (PA) 2, a single-pole four-throw dual-frequency antenna switch 3, two radio frequency integrated devices 4 and 5, and A radio frequency transceiver chip 6 having two receiving channels. The single-pole four-throw dual-frequency antenna switch 3 is respectively connected with an antenna, an RF power amplifier and two RF integrated devices; two RF integrated devices 4 and 5, whose input ends are respectively connected to two receiving bands corresponding to the dual-frequency antenna switch On the channel, the first RF integrated device 4 is a device integrating a single-pole double-throw switch and two single-frequency filters (GSM850 filter and GSM900 filter), and the second RF integrated device 5 is integrated with one Single-pole dual 4 Zheng switch and two single-frequency filters (GSM 1800 filter and GSM 1900 filter). As can be seen from Fig. 6, the single-pole double-four-turn switch is integrated in the front end of the single-frequency filter. Through this processing, the function requirements of the four-frequency are easily realized, and the layout trace is more simplified; the RF transceiver chip with two receiving channels 6 , wherein each receiving channel is respectively connected to an output end of a radio frequency integrated device. It should be noted that, as shown in FIG. 6, the transmitting channel of the RF transceiver chip is connected to the PA 2, and the RF transceiver chip sends the signal through the PA and the antenna. For details, refer to the description in the related art, and details are not described herein. Further, by adding two new RF integrated devices on the receiving channel of the single-pole four-throw dual-frequency antenna switch and the RF transceiver chip, the frequency band can be selected. Specifically, the single-pole double-throw switch in the RF integrated device on the low-frequency receiving channel selects GSM850 and GSM900 to enter different SAW filters in the RF integrated device, and their differential output channels are combined and enter the RF transceiver chip low-frequency LNA. Perform the next step; single-pole double-throw switch in the RF integrated device on the high-frequency receiving channel, select GSM1800 and GSM1900, and enter different SAW filters in the RF integrated device. Their differential output channels are combined and then input into the RF transceiver. The chip high frequency LNA is processed in the next step. According to an embodiment of the present invention, there is also provided a wireless terminal, including but not limited to the above-described four-band GSM transceiver. The four-band GSM transceiver can be referred to the description of FIG. 3 to FIG. 6, and is not mentioned here. In summary, with the above embodiments provided by the present invention, the GSM quad-band scheme can be implemented relatively easily by using the new radio frequency integrated device in the quad-band GSM transceiver. The new RF integrated device selects the accurate SAW filter receiving channel with appropriate logic control to achieve strict filtering before entering the RF transceiver chip, ensuring that the receiving performance of the terminal meets the design requirements. In terms of circuit implementation, layout and routing are also simplified, and valuable space is gained for increasing integration requirements. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed among multiple computing devices. On the network, optionally, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made in the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

The present invention provides a four-band global mobile communication GSM transceiver, comprising: an antenna, the transceiver further comprising:

a dual-frequency antenna switch is respectively connected to the antenna and two radio frequency integrated devices; the two RF integrated devices have their input ends respectively connected to two receiving frequency band channels corresponding to the dual-frequency antenna switch, wherein Each of the radio frequency integrated devices is a device integrating a single-pole double-throw switch and a filter corresponding to two frequency bands; a radio frequency transceiver chip having two receiving channels, wherein each receiving channel and one of the radio frequency integrated devices respectively The outputs are connected. The transceiver device according to claim 1, wherein the radio frequency integrated device comprises: a single-pole double-twist switch connected to a receiving frequency channel corresponding to the dual-frequency antenna switch;

a first single-band surface acoustic wave SAW filter having an input coupled to a first end of the single pole double throw switch;

A second single-band SAW filter having an input coupled to the second end of the single-pole double-throw switch. The transceiver device according to claim 1, wherein the radio frequency integrated device comprises: a single-pole double-twist switch connected to a receiving frequency channel corresponding to the dual-frequency antenna switch;

A dual band SAW filter with an input connected to the single pole double throw switch. The transceiver device according to claim 1, wherein

The filter corresponding to the two frequency bands in the radio frequency integrated device is a high frequency band filter, wherein a frequency band corresponding to the high frequency band filter is higher than a predetermined threshold;

The filter corresponding to the two frequency bands in the other radio frequency integrated device is a low frequency band filter, wherein a frequency band corresponding to the low frequency band filter is lower than the predetermined threshold. The transceiver device according to claim 4, wherein the radio frequency transceiver chip comprises: a low frequency LNA and a high frequency LNA; The high frequency band filter is connected to the high frequency LNA through a receiving channel of the radio frequency transceiver chip;

The low band filter is coupled to the frequency band LNA through another receive channel of the radio frequency transceiver chip.

6. The transceiver of claim 4, wherein

The frequency band corresponding to the high frequency band filter is a GSM 1800 frequency band and a GSM 1900 frequency band;

The frequency bands corresponding to the low-band filter are the GSM 850 band and the GSM 900 band.

7. The transceiver device according to claim 1, wherein

The transceiver device further includes: a radio frequency power amplifier located on a transmitting channel between the dual-frequency antenna switch and the radio frequency transceiver chip;

The dual frequency antenna switch and the radio frequency power amplifier are integrated in a radio frequency transmitting module.

The transceiver device according to claim 1, wherein the antenna is a passive device having a quad-frequency transceiving function.

A wireless terminal, comprising the quad-band GSM transceiver of any one of claims 1 to 8.