CN103067548B - Mobile phone receives debug system and the method for the sensitivity of difference match circuit - Google Patents

Mobile phone receives debug system and the method for the sensitivity of difference match circuit Download PDF

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Publication number
CN103067548B
CN103067548B CN201110322035.3A CN201110322035A CN103067548B CN 103067548 B CN103067548 B CN 103067548B CN 201110322035 A CN201110322035 A CN 201110322035A CN 103067548 B CN103067548 B CN 103067548B
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mobile phone
lun
match circuit
difference
sensitivity
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CN103067548A (en
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阳子奇
陈奎
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BYD Co Ltd
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BYD Co Ltd
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Abstract

The invention provides the debug system that a kind of mobile phone receives the sensitivity of difference match circuit, described system comprises the mobile phone comprehensive test instrument having radio frequency and the mobile phone of baseband circuit and be connected with mobile phone radio frequency test bench, the sim card slot of described mobile phone is assigned the test card of mobile phone comprehensive test instrument, the receiving path of mobile phone comprises the duplexer, duplexer, the first Ba Lun, the second Ba Lun and the transceiver that are linked in sequence.The present invention also provides a kind of mobile phone to receive the adjustment method of difference match circuit sensitivity.In the debug system that mobile phone provided by the invention receives the sensitivity of difference match circuit and method, the difference match circuit in prior art between duplexer and transceiver is removed, two Ba Lun are linked in sequence between duplexer and transceiver.Owing to have employed two Ba Lun interoperability tests, obtain the limiting snesibility value that pcb board can reach, based on this limiting snesibility value, to the debugging of difference match circuit, there is directive significance, avoid debugging blindly and emulation.

Description

Mobile phone receives debug system and the method for the sensitivity of difference match circuit
Technical field
The invention belongs to communication field, particularly relate to debug system and method that a kind of mobile phone receives the sensitivity of difference match circuit.
Background technology
The receiving sensitivity of wireless transmission is similar to hearing when people link up talk, and the receiving sensitivity improving signal can make wireless product have the ability of catching weak signal more strongly.Like this, along with the increase of transmission range, Received signal strength will die down, but highly sensitive wireless product still can receive data, remain stable and will connect, significantly improve transmission range.The transmission of radio wave is " crossing the Rubicon ", and when the signal energy of receiving terminal is less than the receiving sensitivity of nominal, receiving terminal can not receive any data, and that is receiving sensitivity is that receiving terminal can the minimum threshold of Received signal strength.
At present, mobile communication terminal radio-frequency performance receives much concern, and the performance of complete machine receiving sensitivity can objectively respond final emitting performance and the receptivity of mobile terminal.
The integrated level of mobile terminal radio frequency chip used is more and more higher, design also greatly simplifies, for receiving path, mainly comprise duplexer, duplexer, difference match circuit and transceiver, and low noise amplifier, frequency mixer are in a transceiver integrated, Surface Acoustic Wave Filter has been integrated in duplexer or duplexer.Under this receiving path structure, how to improve receiving sensitivity, its emphasis is just how to debug out best difference match circuit.
BER(Bit Error Ratio, is called for short bit error rate), be used to the metering method weighing receiver sensitivity.Please refer to shown in Fig. 1, the general principle of BER is, tester 11 produces the fixing pseudo noise code (PRBS-15) of signal strength signal intensity, mobile phone 12 is transmitted to after encoded modulation, data demodulates is decoded after receiving by mobile phone 12, then send to tester 11 by transmitter after encoded modulation, tester 11 carrys out mistake in computation Bit quantity by the data comparing transmitting and receiving after data demodulates being decoded, thus calculates BER.
The sensitivity of receiver can weigh the quality of its receptivity by test total noise of centrifuge coefficient (NF), and NF is showed by the height of BER.
Minimum receiving sensitivity S min=-174+10log(BW)+NF+S/N.
Wherein ,-174: thermal noise density.
Background noise is also thermal noise, thermal noise is produced by the random motion of electronics in transmission medium, in a communications system, the noise that resistance device noise and receiver produce all can be equivalent to thermal noise, its power spectral density is all equally distributed in whole frequency range, because its noise power Spectral structure close to white light is also known as white noise.
BW: signal bandwidth.
NF: receiver total noise of centrifuge coefficient.
S/N: receiver minimum demodulating thresholding 6dB, S/N=(E b/ N 0)/(R/B), wherein E bfor the power of per bit code in channel, N 0for noise spectral density, R is message transmission rate, and B is transmission bandwidth.
By analyzing above and can finding: for receiving sensitivity, after signal bandwidth (BW) and demodulation threshold (S/N) determined by system, it is adjustable just only has receiver total noise of centrifuge coefficient (NF).Therefore, how optimizing NF to improve receiving sensitivity is need the problem of solution badly; And the quality of difference match circuit will have influence on NF in receiving path structure.
Please refer to shown in Fig. 2, a typical low noise amplifier difference match circuit comprises the first electric capacity C1, the second electric capacity C2 and inductance L.The input of WCDMA high channel receiving terminal low noise amplifier applies differential configuration as connection, and the both positive and negative polarity of its difference match circuit connects two pins of the Differential Input of transceiver 22 respectively; And the path of WCDMA receiving terminal be from duplexer 21 through the impedance transfer circuit of 50 ohm of an optimum Match to the input port of difference low noise amplifier.
Summary of the invention
The object of this invention is to provide the debug system that a kind of mobile phone receives the sensitivity of difference match circuit, achieve the test to the limiting snesibility that pcb board can reach, so just can get rid of other couplings to affect improperly, when existing typesetting (Layout) and device layout, obtain the receptivity that pcb board self is best.Based on this limiting snesibility value, to the debugging of difference match circuit, there is directive significance, avoid debugging blindly and emulation.
The object of the invention is to be achieved through the following technical solutions:
A kind of mobile phone receives the debug system of difference match circuit sensitivity, described system comprises the mobile phone comprehensive test instrument having radio frequency and the mobile phone of baseband circuit and be connected with mobile phone radio frequency test bench, the sim card slot of described mobile phone is assigned the test card of mobile phone comprehensive test instrument, the receiving path of mobile phone comprises the duplexer, duplexer, the first Ba Lun, the second Ba Lun and the transceiver that are linked in sequence.
The present invention also provides a kind of mobile phone to receive the adjustment method of difference match circuit sensitivity, adopts aforesaid mobile phone to receive the debug system of difference match circuit sensitivity, said method comprising the steps of:
S1, starting hand-set described mobile phone is completed look for net registration by arranging mobile phone comprehensive test instrument;
S2, utilize the BER of mobile phone comprehensive test instrument testing mobile phone, obtain receiving sensitivity value;
S3, utilize network analyzer, the input and output impedance of test docking first Ba Lun and the second Ba Lun;
S4, by simulation software, obtain the value of the first electric capacity in difference match circuit, the second electric capacity and inductance.
In the debug system that mobile phone provided by the invention receives the sensitivity of difference match circuit and method, the difference match circuit in prior art between duplexer and transceiver is removed, two Ba Lun are linked in sequence between duplexer and transceiver.Owing to have employed two Ba Lun interoperability tests, obtain the limiting snesibility value that pcb board can reach, so just can get rid of other couplings to affect improperly, when existing typesetting (Layout) and device layout, obtain the receptivity that pcb board self is best.Based on this limiting snesibility value, to the debugging of difference match circuit, there is directive significance, avoid debugging blindly and emulation.
Accompanying drawing explanation
Fig. 1 is the calculating BER schematic flow sheet that prior art provides.
Fig. 2 is the low noise amplifier difference match circuit structural representation that prior art provides.
Fig. 3 is docking provided by the invention debugging difference match circuit structural representation.
Fig. 4 is equivalent differential matching network structural representation provided by the invention.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Please refer to shown in Fig. 3, a kind of mobile phone receives the debug system of difference match circuit sensitivity, described system comprises the mobile phone comprehensive test instrument having radio frequency and the mobile phone of baseband circuit and be connected with mobile phone radio frequency test bench, the sim card slot of described mobile phone is assigned the test card of mobile phone comprehensive test instrument, the receiving path of mobile phone comprises the duplexer, duplexer 31, first Ba Lun 32, second Ba Lun 33 and the transceiver 34 that are linked in sequence.
Mobile phone provided by the invention receives in the debug system of difference match circuit sensitivity, difference match circuit in prior art between duplexer and transceiver is removed, two Ba Lun (BALance to UNbalance is called for short balanced-unbalanced transformer) are linked in sequence between duplexer and transceiver.Owing to have employed two Ba Lun interoperability tests, obtain the limiting snesibility value that pcb board can reach, so just can get rid of other couplings to affect improperly, when existing typesetting (Layout) and device layout, obtain the receptivity that pcb board self is best.Based on this limiting snesibility value, to the debugging of difference match circuit, there is directive significance, avoid debugging blindly and emulation.
As concrete execution mode, described first Ba Lun 32 is identical with the model of the second Ba Lun 33, and model specifically can be selected to be the Ba Lun of LDB181G9510C-110, ensures the impedance transfer of 50 ohm thus.
As concrete execution mode, got up by connector docking between described first Ba Lun 32 and single-ended (Single-end) of the second Ba Lun 33, be connected by radio-frequency (RF) coaxial line between the difference output end of described duplexer 31 and the difference port of the first Ba Lun 32, between the difference port of the second Ba Lun 33 and the input of transceiver 34 radio band.Adopt radio-frequency (RF) coaxial line to connect, the matched well between duplexer and two Ba Lun can be ensured, simultaneously coaxial line to try one's best short, reduce Insertion Loss.As a kind of embodiment, the pad that the difference output pin of duplexer 31 is nearest welds two flexible radio frequency coaxial lines (Cable), the pad that the WCDMA 1900 frequency range input pin of transceiver is nearest also welds two flexible radio frequency coaxial lines (Cable), the first Ba Lun of docking and two pairs of difference ports of the second Ba Lun are connected on two groups of flexible radio frequency coaxial lines (Cable).Similarly, also can connect by radio-frequency (RF) coaxial line between described mobile phone comprehensive test instrument and mobile phone radio frequency test bench.
The present invention also provides a kind of mobile phone to receive the adjustment method of difference match circuit sensitivity, adopts aforesaid mobile phone to receive the debug system of difference match circuit sensitivity, said method comprising the steps of:
S1, starting hand-set described mobile phone is completed look for net registration by arranging mobile phone comprehensive test instrument;
S2, utilize the BER of mobile phone comprehensive test instrument testing mobile phone, obtain receiving sensitivity value;
S3, utilize network analyzer, the input and output impedance of test docking first Ba Lun and the second Ba Lun;
S4, by simulation software, obtain the value of the first electric capacity in difference match circuit, the second electric capacity and inductance.
Mobile phone provided by the invention receives in the adjustment method of difference match circuit sensitivity, difference match circuit in prior art between duplexer and transceiver is removed, two Ba Lun (BALance to UNbalance is called for short balanced-unbalanced transformer) are linked in sequence between duplexer and transceiver.Owing to have employed two Ba Lun interoperability tests, obtain the limiting snesibility value that pcb board can reach, so just can get rid of other couplings to affect improperly, when existing typesetting (Layout) and device layout, obtain the receptivity that pcb board self is best.Based on this limiting snesibility value, to the debugging of difference match circuit, there is directive significance, avoid debugging blindly and emulation.
In described step S1, the model of described mobile phone comprehensive test instrument is Agilent8960; Certainly, those skilled in the art according to actual needs, can also select the comprehensive test instrument of other model, such as CMU200.Below will for WCDMA1900, adjustment method mobile phone being received to the sensitivity of difference match circuit is described in detail.
As embodiment, specifically comprise the steps: in described step S1
S11, Agilent8960 mobile phone comprehensive test instrument to be resetted, and be switched to WCDMA interface.
S12, first by operation mode(operator scheme) be set to cell off(close base station).
S13, by cell parameter(base station parameter) in BCCH Update Page(Broadcast Control Channel upgrade paging) to be set to Auto(automatic); PS Domain Information(PS domain information) to be set to Present(online); IMSI Attach Flag State(IMSI connects flag states) be set to Set(setting).
S14, by Call Parms(calling parameter) in RLC Reestablish(radio link control reset) be set to Off(close).
S15, by Call Parms(calling parameter) in Cell Power(base station power) be set to-65.
S16, by Call Parms(calling parameter) in UE Target Power(end objectives power) be set to 24.
S17, finally by operation mode(operator scheme) be set to Active cell(and open base station).
So far, complete starting hand-set and described mobile phone completed look for the step of net registration by arranging mobile phone comprehensive test instrument.
As embodiment, in described step S2, select Band(frequency range) the DL channel(down channel of 2) test receives BER, specifically comprises the steps:
S21, by UARFCN Parms(channel number parameter) in DL channel(down channel) be set to 9662.
S22, by Call Control(Call-Control1) be set to Originate Call(original call).
S23, by Measurement Selection(measure select) be set to the Loopback BER(winding error rate).
S24, progressively turn Call Parms(calling parameter down), and record the Cell Power(base station power when BER is less than pre-set threshold value) value, using the Sensitirity va1ue of described base station power value under present channel.
Further, BER described in step S24 is less than pre-set threshold value and is specially:
BER is less than 2.439% in gsm networks;
BER is less than 0.1% in a wcdma network.
So far, complete the BER utilizing mobile phone comprehensive test instrument testing mobile phone, obtain the step of receiving sensitivity value.
As embodiment, specifically comprise the steps: in described step S3
S31, the start-stop frequency of network analyzer is set, is specially Start(and plays dot frequency) be set to 1.8GHz; Stop(stops frequency) be set to 2.2GHz.
The 4-port cal(4 port calibration of S32, calibration network analyzer).
S33, by Analysis(analyze) be set to Fixture Simulator(fixed-analog);
By Topology(topological structure) be set to Bal-Bal(Ba Lun-Ba Lun);
By BalUn(Ba Lun) in ON(open) be set to the whole track of BalUn ON All Traces(Ba Lun and open);
By Port ZConversion(port Z-transformation) be set to ON(and open);
By Diff ZConversion(difference port Z-transformation) be set to ON(and open), Port1(bal) Real(port one) be set to 100 Ω, Port2(bal) Real(port 2) be set to 100 Ω.
S34, by Format(design) in the former figure of Smith(Smith) be set to R+jX.
S35, by Measurement(measure) be set to Sdd11.
S36, by Measurement(measure) be set to Sdd22.
So far, complete the test of docking Ba Lun input and output impedance, obtain input impedance Z swith output impedance Z lvalue.
As embodiment, please refer to shown in Fig. 4, specifically comprise the steps: in described step S4
S41, in the schematic diagram of simulation software ADS, set input/output port and corresponding impedance, be specially:
Select File(file) in New Design(newly design), in the tab ejected, select Sparameter(S parameter).
S42, in schematic diagram, add Smith Chart Matching(Smith chart coupling) control, and relevant frequency and input and output impedance parameter are set, are specially:
S421, at schematic(schematic diagram) in select Smith Chart Matching(Smith chart coupling);
S422, connection Term(condition) and Smith Chart Matching component(Smith chart coupling components and parts);
S423, double-click smith chart matching component(Smith chart coupling components and parts) and arrange:
Fp(frequency) be set to 1960MHz;
SourceType(Source Type)=Complex Impedance(complex impedance);
Zg(source impedance) be set to input impedance Z swith, Zl(load impedance) be set to output impedance Z l;
SourceImpType(source complex data type)=Source Impedance(source impedance);
Loadtype(loadtype)=complex impedance(complex impedance);
Loadenable(load is enable)=true(opens).
S43, in principle diagram design window, open Smith Chart Utility(Smith chart program), import corresponding Smith Chart Matching(Smith chart coupling) relevant parameter of control or input relevant parameter, be specially:
Select update smartcomponent from smith chart utility(more new element in Smith chart program);
Select Fre and Zo(normalized impedance);
Click Define Source/Load Network Termination(and define source/laod network terminal).
S44, in Smith Chart Utility(Smith chart program) in select device to complete coupling.
The schematic diagram of S45, generation coupling, is welded to value of the first electric capacity C1, the second electric capacity C2 and inductance L in this group difference match circuit obtained on checking mobile phone circuit pcb board, obtains the value of sensitivity.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. the debug system of mobile phone reception difference match circuit sensitivity, it is characterized in that, described system comprises the mobile phone comprehensive test instrument having radio frequency and the mobile phone of baseband circuit and be connected with mobile phone radio frequency test bench, the sim card slot of described mobile phone is assigned the test card of mobile phone comprehensive test instrument, the receiving path of mobile phone comprises the duplexer, duplexer, the first Ba Lun, the second Ba Lun and the transceiver that are linked in sequence; Described first Ba Lun and the second Ba Lun single-ended between docked by connector, be connected by radio-frequency (RF) coaxial line between the difference output end of described duplexer and the difference port of the first Ba Lun, between the difference port of the second Ba Lun and the input of transceiver radio band; Tested the input and output impedance of docking first Ba Lun and the second Ba Lun by network analyzer, and then utilize simulation software to obtain the value of the first electric capacity in difference match circuit, the second electric capacity and inductance.
2. mobile phone according to claim 1 receives the debug system of difference match circuit sensitivity, and it is characterized in that, described first Ba Lun is identical with the model of the second Ba Lun.
3. mobile phone receives an adjustment method for difference match circuit sensitivity, it is characterized in that, adopts the mobile phone according to any one of claim 1-2 to receive the debug system of difference match circuit sensitivity, said method comprising the steps of:
S1, starting hand-set described mobile phone is completed look for net registration by arranging mobile phone comprehensive test instrument;
S2, utilize the BER of mobile phone comprehensive test instrument testing mobile phone, obtain receiving sensitivity value;
S3, utilize network analyzer, the input and output impedance of test docking first Ba Lun and the second Ba Lun;
S4, by simulation software, obtain the value of the first electric capacity in difference match circuit, the second electric capacity and inductance.
4. mobile phone according to claim 3 receives the adjustment method of difference match circuit sensitivity, and it is characterized in that, in described step S1, the model of described mobile phone comprehensive test instrument is Agilent8960.
5. mobile phone according to claim 3 receives the adjustment method of difference match circuit sensitivity, and it is characterized in that, described step S2 comprises:
Progressively calling parameter value is turned down by mobile phone comprehensive test instrument, and record the base station power value when BER is less than pre-set threshold value, using the Sensitirity va1ue of described base station power value under present channel.
6. mobile phone according to claim 5 receives the adjustment method of difference match circuit sensitivity, and it is characterized in that, described BER is less than pre-set threshold value and is specially:
BER is less than 2.439% in gsm networks;
BER is less than 0.1% in a wcdma network.
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CN109041094A (en) * 2018-07-18 2018-12-18 Oppo广东移动通信有限公司 Radio circuit adjustment method and relevant apparatus

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Publication number Priority date Publication date Assignee Title
CN106341831B (en) * 2015-07-07 2019-08-30 中国移动通信集团公司 A kind of measurement method and device of sensitivity
CN109041095B (en) * 2018-07-18 2021-06-25 Oppo广东移动通信有限公司 Radio frequency circuit debugging method and related device

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CN1633766A (en) * 2001-08-30 2005-06-29 安立股份有限公司 Protable radio terminal testing apparatus using single self-complementary antenna

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US7463875B2 (en) * 2004-09-24 2008-12-09 Samsung Electronics Co., Ltd. Wireless device minimizing use of external bandpass filter between low-noise amplifier and first mixer

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CN1633766A (en) * 2001-08-30 2005-06-29 安立股份有限公司 Protable radio terminal testing apparatus using single self-complementary antenna

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Publication number Priority date Publication date Assignee Title
CN109041094A (en) * 2018-07-18 2018-12-18 Oppo广东移动通信有限公司 Radio circuit adjustment method and relevant apparatus

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