CN101094480A - Circuit structure for improving influence on CDMA sensitivity from GSM switch in dual modes handset - Google Patents

Circuit structure for improving influence on CDMA sensitivity from GSM switch in dual modes handset Download PDF

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Publication number
CN101094480A
CN101094480A CNA2007101380099A CN200710138009A CN101094480A CN 101094480 A CN101094480 A CN 101094480A CN A2007101380099 A CNA2007101380099 A CN A2007101380099A CN 200710138009 A CN200710138009 A CN 200710138009A CN 101094480 A CN101094480 A CN 101094480A
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frequency
port
radio
switch
path
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CN100579269C (en
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秦宇
程守刚
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ZTE Corp
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ZTE Corp
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Abstract

The invention comprises: a RF amplifier and a receiving filter. It also comprises: a duplexer whose public end is connected to the antenna; two circulators each having public port, transmitting path port and receiving path port, and wherein each public port is respectively connected to the low frequency port and high frequency port of the duplexer; two RF switch groups respectively connected between the two circulators and the receiving path, and wherein each port at each RF switch side is respectively connected to the transmitting path port and the receiving path port of each circulator, and the other port at RF switch side is respectively connected to the output port of RF amplifier and the input end of the filer.

Description

Improve the circuit structure that the GSM switch influences CDMA sensitivity in the dual-mode handset
Technical field
The present invention relates to a kind of circuit structure of GSM/CDMA dual-mode handset GSM switch that be used for improving to the influence of CDMA sensitivity.
Background technology
The GSM/CDMA dual-mode handset is the mobile communication terminal of standby simultaneously of two kinds of standards of a kind of GSM of support, CDMA even communication simultaneously.Owing to there is the phase mutual interference in the contiguous reason of frequency, the certain influence of wireless performance generation to separately is called for short GC and disturbs mutually this class dual-mode handset when the wireless module of two kinds of standards is worked simultaneously.
GC disturbs mutually and has polytype, and the present invention pays close attention to is significantly type of the more hidden and interference effect of a kind of interference channel.We find under study for action, and sensitivity has the influence of burst to CDMA in the switching meeting of its front radio-frequency switch during the GSM standby, as long as CDMA is in high-power emission state, even GSM transmitting power this moment is very little, this burst effect does not weaken.Simultaneously we find, bursty interference and GSM, the lasting interference when the CDMA radio circuit is worked simultaneously during this GSM standby come from a kind of mechanism.
For weakening the phase mutual interference between GSM and the CDMA, the general method of using of designer is the isolation that improves between GSM antenna and the CDMA antenna.The raising of isolation between antennas is effectively for weakening that GC disturbs mutually, but under antenna for mobile phone technical merit at present, improves the not a duck soup of isolation between antennas own.Generally speaking, the size restrictions of mobile phone the isolation between antennas highest level that can reach.Therefore for above-mentioned bursty interference,, can weaken in theory by increasing isolation between antennas, but practical application to get up not be very effective.
As can be seen, increasing isolation between antennas is to weaken harmful effect by increasing transmission path loss, does not fundamentally address this problem.By intensive experiment and analysis, found the generation mechanism that the type is disturbed:
One, a part of power of transmitting of CDMA is coupled to the GSM antenna by antenna, enters the GSM radio circuit;
Two, the impedance conversion of radio frequency path has caused transmit spread spectrum in the GSM circuit of CDMA in the work that determined of GSM circuit structure;
Three, returned by the emission path of the CDMA signal behind the spread spectrum through GSM, and pass through the GSM aerial radiation to aerial, and received by the CDMA antenna again, drop on CDMA and receive the reception path that the interior power of frequency range enters CDMA, become interference noise, influence the receiving sensitivity of CDMA.
If the transmitting power of CDMA is little, then the amplitude of consequent interference noise is very little, tangible influence can not arranged to the receiving sensitivity of CDMA.If opposite CDMA is with high-power emission, the amplitude of consequent interference noise increases with the width of cloth, can produce significantly obviously influence to the CDMA receiving sensitivity.
At present the radio frequency structure of GSM mobile handset mainly contains two kinds, and a kind of is to use duplexer module (being called for short ASM) (as shown in Figure 1) below the antenna, and another kind is to use front-end module (being called for short FEM) (as shown in Figure 2) below the antenna.ASM is the combination of duplexer and radio-frequency (RF) switch.Duplexer is used for separating the height frequency range, and (for convenience of explanation, this paper is referred to as low-frequency range to 850M frequency range and 900M frequency range where necessary; 1800M frequency range and 1900M frequency range are referred to as high band), and all show as passband and do not have the restriction of direction for the 850M that is all low-frequency range and 900M frequency range, to the 1800M that is all high band and 1900M frequency range equally without any restriction.
Radio-frequency (RF) switch is the single-pole double-throw switch (SPDT) that switches between transmitting-receiving two paths.ASM down is exactly the circuit that receives and launch again.FEM mainly is the combination of radio-frequency (RF) switch and radio-frequency (RF) power amplification, and the radio-frequency (RF) switch here is the single pole multiple throw that switches between the reception of each frequency range and emission path.FEM down is exactly each reception and emission path again.These circuit structures have caused directly falling on the radio-frequency (RF) switch from the CDMA signal that antenna receives.And the GSM circuit is in communication process, and radio-frequency (RF) switch is switched between each path of transmitting-receiving, has caused the moment conversion of the impedance of radio frequency path.From the frequency domain angle, the switching of radio-frequency (RF) switch contains abundant harmonic wave, these harmonic waves are modulated on the CDMA that receives transmits, and the frequency that is equivalent to CDMA is transmitted is carried out bilateral expansion, produced than the CDMA signal spectrum also wide Duo, envelope is the frequency spectrum of raised cosine in shape.
Experiment confirm, because the transmitting-receiving frequency of CDMA850M frequency range is spaced apart 45MHz, and the transmitting-receiving frequency of CDMA1900M frequency range is spaced apart 80MHz, so this interference type is more more obvious than 1900M frequency range to the influence of sensitivity in the 850M frequency range.
Summary of the invention
In order to overcome the problems of the prior art, the invention provides a kind of circuit structure that dual-mode handset GSM switch influences CDMA sensitivity that is used to solve, fundamentally solve dual-mode handset when the high-power emission of CDMA, the The noise that the CDMA receiving sensitivity is returned by the GSM circuit.
According to the present invention, a kind of circuit structure is provided, be used for improving of the influence of GSM/CDMA dual-mode handset GSM switch to CDMA sensitivity, comprise radio-frequency (RF) power amplification and receiving filter, also comprise: duplexer, its common port is connected to antenna; Two circulators have public port, emission access port respectively and receive access port, and wherein each above-mentioned public port is connected respectively to the low-frequency range port and the high band port of above-mentioned duplexer; And two radio-frequency (RF) switch groups, be connected in series in respectively between two above-mentioned circulators and the transmitting-receiving path, wherein one of each above-mentioned radio-frequency (RF) switch routine port is connected respectively to the emission access port of each above-mentioned circulator and receives access port, and the opposite side port of each above-mentioned radio-frequency (RF) switch is connected respectively to the output port of above-mentioned radio-frequency (RF) power amplification and the input port of above-mentioned receiving filter.
Duplexer can be the double frequency duplexer.The direction of the signal flow in the circulator can for from above-mentioned emission access port to above-mentioned public port, and from above-mentioned public port to above-mentioned reception access port.
In addition, the radio-frequency (RF) switch group can be a radio frequency linked switch group, comprise two radio-frequency (RF) switch by same signal control, when one of them above-mentioned radio-frequency (RF) switch is connected the emission path, another above-mentioned radio-frequency (RF) switch disconnects and receives path, and above-mentioned radio-frequency (RF) switch is when connecting above-mentioned reception path, and another above-mentioned radio-frequency (RF) switch disconnects above-mentioned emission path.
Wherein, the working frequency range that is connected to the above-mentioned circulator of above-mentioned low-frequency range port can be 824MHz~960MHz.In addition, the working frequency range that is connected to the above-mentioned circulator of above-mentioned high band port can be 1710MHz~1990MHz.
Thereby, adopt circuit structure of the present invention, efficiently solve the generation root of interference.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the GSM mobile handset radio circuit of ASM of the prior art;
Fig. 2 is the schematic diagram of the GSM mobile handset radio circuit of FEM of the prior art;
Fig. 3 is the generalized schematic of structure in a circuit according to the invention; And
Fig. 4 is the particular circuit configurations schematic diagram of the GSM mobile handset radio circuit of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
The switching of the radio-frequency (RF) switch that has its source in of aforesaid this class interference type.For the GSM signal,, therefore can not produce extra frequency in the switch handoff procedure because of the switching of switch because the transmitting-receiving path is closed.And transmitting for CDMA, since between switch and the antenna without any the measure that suppresses and isolate, transmitting of CDMA directly fallen on the radio-frequency (RF) switch of GSM, the impedance conversion that produces in the moment that switch switches causes the spread spectrum of CDMA, has no the ground of obstruction again and is launched by the GSM antenna.Therefore, the countermeasure that we take is to increase a kind of isolating device, the impedance of stablizing radio frequency path between the antenna of GSM and radio-frequency (RF) switch.
Fig. 3 is the schematic diagram according to GSM mobile handset radio circuit of the present invention.As shown in Figure 3, be used for improving GSM/CDMA dual-mode handset GSM switch the circuit structure 300 of the influence of CDMA sensitivity is comprised radio-frequency (RF) power amplification 302 and receiving filter 304, in addition, also comprise: duplexer 306, its common port is connected to antenna; Two circulator 308a, 308b have public port, emission access port respectively and receive access port, and wherein each public port is connected respectively to low-frequency range port and the high band port of duplexer 306a, 306b; And two radio-frequency (RF) switch groups 310, be connected in series in respectively between two circulator 308a, 308b and the transmitting-receiving path, wherein a side ports of each radio-frequency (RF) switch is connected respectively to the emission access port of each circulator 308 and receives access port, and the opposite side port of each radio-frequency (RF) switch is connected respectively to the output port of radio-frequency (RF) power amplification 302 and the input port of receiving filter 304.
Wherein, duplexer 306 is double frequency duplexers.
And, the direction of the signal flow among circulator 308a, the 308b be from the emission access port to public port, and from public port to receiving access port.
In addition, radio-frequency (RF) switch group 310 is radio frequency linked switch groups, comprise two radio-frequency (RF) switch by same signal control, when one of them radio-frequency (RF) switch is connected the emission path, another radio-frequency (RF) switch disconnects and receives path, and radio-frequency (RF) switch connecting when receiving path, and another radio-frequency (RF) switch disconnects emission path.
Wherein, the working frequency range that is connected to the circulator of low-frequency range port is 824MHz~960MHz.
And the working frequency range that is connected to the circulator of high band port is 1710MHz~1990MHz.
Fig. 4 is the schematic diagram of particular circuit configurations of the GSM mobile handset radio circuit of the embodiment of the invention.As shown in Figure 4, for guaranteeing the compatibility of GSM to four frequencies, the duplexer 406 under the GSM antenna is four frequency duplexers, and the height frequency range is separated.Public port connects antenna, and the low-frequency range port is received the low-frequency range path by 850MHz and 900MHz signal, and the high band port is received the high band path by 1800MHz and 1900MHz signal.
The high and low frequency range port of duplexer 406 respectively connects the circulator 408 of one three port, and circulator 408 working frequency range on the low-frequency range path cover 824MHz~960MHz, and circulator 408 working frequency range on the high band path cover 1710MHz~1990MHz.A port of circulator 408 is received duplexer 406 as public port, and two ports are received the emission path respectively and received path in addition, as launching access port and receiving access port.Connected mode guarantees that the directions of signal flow of circulator 408 is: the emission access port is to public port, and public port is to receiving access port.
The emission access port of three port circulators 408 and reception access port are received accordingly by radio-frequency (RF) switch 410 and are transmitted and received in the path.The radio-frequency (RF) switch 410 here is a radio frequency linked switch group, and each combination comprises two radio-frequency (RF) switch, controls its switching direction by identical control signal, guarantees that receiving path when the emission path is connected disconnects, and the emission path disconnects when perhaps receiving the path connection.
Radio frequency linked switch group 410 is serially connected in the middle of circulator 408 and the transmitting-receiving path.Wherein the port of a side is received the emission access port of circulator 408 respectively and is received access port, and the port of opposite side is received the output port of radio-frequency (RF) power amplification 402 and the input port of receiving filter 404 respectively.
This circuit has utilized the characteristic of the one-way transmission of circulator 408 to make the transmitting-receiving path of GSM become reception unidirectional on the physical significance and emission path from the transmitting-receiving path on the logical meaning, has avoided the reflection of signal in the transmitting-receiving path.This circuit structure has been blocked CDMA that the GSM antenna receives on the one hand and has been transmitted and enter GSM emission path, falls on the radio-frequency (RF) switch, has avoided CDMA signal frequency spectrum on the switch of GSM emission path to be expanded, and the output through power amplifier reflects away again.On the other hand, although the reception path that has portion C DMA to transmit to enter GSM, the faint reverse signal stream of this path can effectively be blocked by circulator.
Therefore, through duplexer, contain CDMA through the GSM aerial radiation hardly to the signal in space again and transmit by the part behind the GSM switch moment spread spectrum.Fundamentally solve the type and disturbed the root that produces.The bigger CDMA of power transmits even the GSM antenna receives down, under the reverse isolation effect of circulator, being transmitted into the aerial intensity by the CDMA signal of spread spectrum by the GSM antenna is effectively suppressed, pass through the decay of antenna transmission path again, fall CDMA and receive interference signal in the path and do not cause interference the CDMA receiving sensitivity.Compare by increasing interference that isolation between antennas weakens the type in essence improvement is arranged.
In sum, by the present invention, can improve in the GSM/CDMA dual-mode handset GSM switch to the influence of CDMA sensitivity.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a circuit structure is used for improving the influence of GSM/CDMA dual-mode handset GSM switch to CDMA sensitivity, comprises radio-frequency (RF) power amplification and receiving filter, it is characterized in that, also comprises:
Duplexer, its common port is connected to antenna;
Two circulators have public port, emission access port respectively and receive access port, and wherein each described public port is connected respectively to the low-frequency range port and the high band port of described duplexer; And
Two radio-frequency (RF) switch groups, be connected in series in respectively between two described circulators and the transmitting-receiving path, wherein a side ports of each described radio-frequency (RF) switch is connected respectively to the emission access port of each described circulator and receives access port, and the opposite side port of each described radio-frequency (RF) switch is connected respectively to the output port of described radio-frequency (RF) power amplification and the input port of described receiving filter.
2. circuit structure according to claim 1 is characterized in that, described duplexer is the double frequency duplexer.
3. circuit structure according to claim 1 is characterized in that, the direction of the signal flow in the described circulator be from described emission access port to described public port, and from described public port to described reception access port.
4. circuit structure according to claim 1, it is characterized in that, described radio-frequency (RF) switch group is a radio frequency linked switch group, comprise two radio-frequency (RF) switch by same signal control, when one of them described radio-frequency (RF) switch is connected the emission path, another described radio-frequency (RF) switch disconnects and receives path, and described radio-frequency (RF) switch is when connecting described reception path, and another described radio-frequency (RF) switch disconnects described emission path.
5. according to each described circuit structure in the claim 1 to 4, it is characterized in that,
The working frequency range that is connected to the described circulator of described low-frequency range port is 824MHz~960MHz.
6. circuit structure according to claim 5 is characterized in that, the working frequency range that is connected to the described circulator of described high band port is 1710MHz~1990MHz.
CN200710138009A 2007-07-26 2007-07-26 Device for improving influence on CDMA sensitivity from GSM switch in dual modes handset Expired - Fee Related CN100579269C (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010045822A1 (en) * 2008-10-22 2010-04-29 中兴通讯股份有限公司 Dual-mode mobile phone and method for inhibiting interference of gsm/cdma
CN101442330B (en) * 2008-12-09 2012-09-26 中兴通讯股份有限公司 Radio frequency circuit and CDMA mobile terminal
WO2013189411A2 (en) * 2013-06-09 2013-12-27 中兴通讯股份有限公司 Communication terminal and method for reducing interferences for communication terminal
CN104753557A (en) * 2015-03-23 2015-07-01 深圳市华信天线技术有限公司 Wireless data transfer radio
WO2015131456A1 (en) * 2014-03-03 2015-09-11 中兴通讯股份有限公司 Multimode dual-path terminal
CN106230469A (en) * 2016-09-27 2016-12-14 广州安波通信科技有限公司 A kind of radio architectures
CN106506034A (en) * 2016-12-05 2017-03-15 中国工程物理研究院电子工程研究所 A kind of low noise switch diplexer
WO2017113693A1 (en) * 2015-12-29 2017-07-06 乐视控股(北京)有限公司 Antenna multiplexing apparatus and mobile terminal
CN109347515A (en) * 2018-10-23 2019-02-15 惠州Tcl移动通信有限公司 A kind of electronic equipment and communication means

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010045822A1 (en) * 2008-10-22 2010-04-29 中兴通讯股份有限公司 Dual-mode mobile phone and method for inhibiting interference of gsm/cdma
US8340608B2 (en) 2008-10-22 2012-12-25 Zte Corporation Dual-mode mobile phone and method of the same for inhibiting GSM/CDMA mutual interference
CN101442330B (en) * 2008-12-09 2012-09-26 中兴通讯股份有限公司 Radio frequency circuit and CDMA mobile terminal
WO2013189411A2 (en) * 2013-06-09 2013-12-27 中兴通讯股份有限公司 Communication terminal and method for reducing interferences for communication terminal
WO2013189411A3 (en) * 2013-06-09 2014-05-08 中兴通讯股份有限公司 Communication terminal and method for reducing interferences for communication terminal
WO2015131456A1 (en) * 2014-03-03 2015-09-11 中兴通讯股份有限公司 Multimode dual-path terminal
EP3116133A1 (en) * 2014-03-03 2017-01-11 ZTE Microelectronics Technology Co., Ltd. Multimode dual-path terminal
EP3116133A4 (en) * 2014-03-03 2017-04-05 ZTE Microelectronics Technology Co., Ltd. Multimode dual-path terminal
US10015701B2 (en) 2014-03-03 2018-07-03 Zte Corporation Multimode dual-path terminal
CN104753557A (en) * 2015-03-23 2015-07-01 深圳市华信天线技术有限公司 Wireless data transfer radio
WO2017113693A1 (en) * 2015-12-29 2017-07-06 乐视控股(北京)有限公司 Antenna multiplexing apparatus and mobile terminal
CN106230469A (en) * 2016-09-27 2016-12-14 广州安波通信科技有限公司 A kind of radio architectures
CN106506034A (en) * 2016-12-05 2017-03-15 中国工程物理研究院电子工程研究所 A kind of low noise switch diplexer
CN109347515A (en) * 2018-10-23 2019-02-15 惠州Tcl移动通信有限公司 A kind of electronic equipment and communication means

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