CN103595433A - Device and method for improving performance consistence of radio frequency SIM card in different mobile phones - Google Patents
Device and method for improving performance consistence of radio frequency SIM card in different mobile phones Download PDFInfo
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- CN103595433A CN103595433A CN201310595048.7A CN201310595048A CN103595433A CN 103595433 A CN103595433 A CN 103595433A CN 201310595048 A CN201310595048 A CN 201310595048A CN 103595433 A CN103595433 A CN 103595433A
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Abstract
A device for improving the performance consistence of a radio frequency SIM card in different mobile phones comprises an antenna and a non-contact front end chips which are called a CLF chip and a safety module chip for short. The device is characterized in that the CLF chip comprises a radio frequency radiating circuit, an impedance matching network and a voltage amplitude detection and judgment circuit are additionally provided, the voltage amplitude detection and judgment circuit detects the amplitude of outer signals of the radio frequency radiating circuit, and the impedance matching network is composed of equivalent capacitors. The impedance matching network formed in a capacitor array mode is added to the CLF chip, the automatic detection circuit is added, through detection on the amplitude of powered emitted signals, a network parameter corresponding to the maximum amplitude value serves as a final parameter, the radiating power of radio frequency radiation circuits in the different mobile phones is adjusted to the maximum, and therefore the influence on the wireless communication performance of the radio frequency SIM card from variation of the mobile phone environment is lowered.
Description
Technical field
The present invention relates to radio-frequency SIM card, particularly a kind of raising radio-frequency SIM card is in the conforming method of different mobile phone performances.
Technical background
Mobile phone radio frequency SIM card is a kind of SIM card that can carry out mobile payment, and the function of its existing SIM card, can realize wireless near field communication again.The functions such as it can integrated mass transit card, bank card and access card, part payment daily life service, facilitates citizens' activities shopping.In recent years, mobile phone radio frequency SIM card develops very fast at home, and after the middle mobile 2.4G Payment Card of releasing, operator and Unionpay have released again the radio-frequency SIM card of a series of 13.56MHz now.
As shown in Figure 1, mobile phone radio frequency SIM card generally comprises three parts: antenna 101, non-contact front-end (Contactless Frontend, referred to as CLF) chip 102, security module (Security Element, referred to as SE) chip 103.SE chip 103 and CLF chip 102 are processed the instruction of receiving by antenna 101, and result is returned to by antenna 101 again.
The area of SIM cards of mobile phones is limited, on a little area, making an antenna 101 that can adapt to a lot of mobile phone environments is very large challenges, and in actual applications, the characteristic of mobile phone is ever-changing, the pattern of SIM card draw-in groove on mobile phone, the material of mobile phone back of the body lid, the factors such as relative position of battery of mobile phone and SIM card all can have a strong impact on the performance of antenna 101.
The maximum characteristic parameter of antenna 101 performance change is variations of antenna 101 sense values.When same radio-frequency SIM card is placed in different mobile phones, the intensity of variation maximum of its antenna 101 sense values can reach more than 2 times.
When the variation of antenna 101 sense values, by
the resonance frequency determining changes, thereby causes meeting in part mobile phone the radio-frequency SIM card of condition of resonance, and in other mobile phones, impedance matching sharply worsens, and has a strong impact on signal transmitting and receiving.While finally causing radio-frequency SIM card to be applied in different mobile phones, consistency of performance variation, affects the handset compatibility of radio-frequency SIM card.
Summary of the invention
The problem that quasi-solution of the present invention is determined is: provide a kind of raising radio-frequency SIM card in the conforming method of different mobile phone performances, overcome SIM antenna sense value and change the correlation impact of radiating circuit transmitting power frequently.
Technical solution of the present invention is as follows:
A kind of raising radio-frequency SIM card is at the conforming device of different mobile phone performances, comprise antenna, non-contact front-end chip, referred to as CLF chip and security module chip, its feature is that described CLF chip comprises radio-frequency transmissions circuit, set up impedance matching network and voltage magnitude and detect and decision circuit, described voltage magnitude detects and decision circuit detects the output signal amplitude of described radio-frequency transmissions circuit, and described impedance matching network consists of equivalent electric capacity.
Described impedance matching network is series network, parallel network or the series-parallel network that electric capacity forms.
Voltage magnitude detection and decision circuit described after powering on detect the amplitude of transmitting of the output of described radio-frequency transmissions circuit, the variation of judgement antenna sense value, and select suitable network parameter according to the actual sense value of antenna, impedance matching network parameter corresponding to the amplitude maximum of usining adaptively, as final argument, makes the maximizes power of radio-frequency transmissions circuit transmitting.
It is to adopt dichotomy automatic search optimum Match electric capacity that described voltage magnitude detection and decision circuit are selected suitable network parameter according to the actual sense value of antenna, and concrete grammar is as follows:
The first step, hunting zone β
2∈ [0.5,0.7], β
2get minimum value-0.5 in hunting zone, record voltage magnitude is now V
1;
Second step, β
2get the maximum 0.7 in hunting zone, record voltage magnitude V now
2;
The 3rd step, voltage magnitude detects and decision circuit (105) compares V
1and V
2if, V
1be greater than V
2, the peak value of the voltage capacitor curve 111 shown in Fig. 5 is in the position of taking back so, and now constriction hunting zone is β
2∈ [0.5,0.1], with seasonal maximum amplitude V
max=V
1; If V
maxequal V
2, now constriction hunting zone is β
2∈ [0.1], with seasonal maximum amplitude V
max=V
1; If V
1be less than V
2, now constriction hunting zone is β
2∈ [0.1,0.7], with seasonal maximum amplitude V
max=V
2;
The 4th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get minimum value wherein, record voltage magnitude is now V
a;
The 5th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get median wherein, record voltage magnitude is now V
b;
The 6th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get maximum wherein, record voltage magnitude is now V
c;
The 7th step, makes the maximum amplitude V of this search
max=max(V
a, V
b, V
c), and by new β
2constriction scope changes to as β
2∈ [V
bcorresponding β
2value, max(V
a, V
c) corresponding β
2value];
Repeat the 4th step to the seven steps, until β
2span only till a remaining unique value, the β now obtaining
2, finalbe called the optimal coefficient after dichotomizing search, the capacitance C=C that it is corresponding
0(1+ β
2, final), C wherein
0for the fiducial value of electric capacity, be the capacitance network parameter of using when matching network adjustment finishes rear CLF chip real work.Principle of the present invention is as follows:
CLF chip of the present invention comprises: impedance matching network; Radio-frequency transmissions circuit and voltage magnitude detect and decision circuit.
Described impedance matching network, whole impedance matching network circuit selects capacitance group to become series network by control switch, parallel network, or series-parallel network.Electric current and impedance are inversely proportional to,
and for the impedance of output impedance matching networks
output impedance and antenna sense value and electric capacity have relation.
Described radio-frequency transmissions circuit comprises reference clock, and second portion is the drive circuit of frequency synthesizer and radio-frequency transmissions circuit.This three partial circuit is all custom circuit.When radio-frequency SIM card works, reference clock used comes from reader carrier wave, and when radio-frequency SIM card powers on the parameter of automatic calibration matching network, reference clock used comes from the standard time clock of mobile phone.The clock sideband of paying close attention to when the frequency of frequency synthesizer output clock depends on radio-frequency SIM card communication.
Described voltage magnitude detects and the operation principle of decision circuit is exactly more measured voltage magnitude, finds out maximum amplitude.The power of antenna is
be directly proportional to voltage magnitude, when voltage magnitude is maximum, transmitting power is also maximum.
Compared with prior art the present invention increases the impedance matching network forming with capacitor array form in CLF chip, increase automatic detection circuit, by the amplitude detection that transmits after powering on, network parameter corresponding to the amplitude maximum of usining is as final argument, the transmitting power of radio-frequency transmissions circuit in different mobile phones is adjusted to maximum, thereby reduce mobile phone environment, change the impact on radio-frequency SIM card performance for wireless communications.
Accompanying drawing explanation
Fig. 1 is the topological diagram of the whole scheme of the present invention;
Fig. 2 is the structure chart of CLF chip of the present invention;
Fig. 3 is CLF refinement of the present invention, comprises matching network figure;
Fig. 4 is the structure chart of radio-frequency transmissions circuit;
Fig. 5 is voltage capacitor curve.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described, but should not limit the scope of the invention with this.
In radio-frequency SIM card system, antenna 101 to external world environment is the most responsive.Suppose under ecotopia, the basis sense value of antenna is L
0, so, when mobile phone environment changes, the sense value of antenna can be expressed as L=L
0(1+ β
1), wherein, β
1∈ [0.25,0.5].
In a concrete application, because user changes mobile phone, there is the variation of 2 times in the sense value L of antenna 101, and the capacitor C in matching network circuit 107 need to have 2 times of above excursions could compensate the variation of antenna sense value accordingly.The fiducial value that records electric capacity is C
0, capacitance C=C
0(1+ β 2), β
2∈ [0.5,0.7].In this specific embodiment, referring to Fig. 3, matching network circuit 107 use 32 capacitor C 1, C2 ... C32 forms array, and adjusting range is each time reference capacitance value C
03.75%.
In the present embodiment, voltage magnitude detect and decision circuit 105 according to the method automatic search optimum Match electric capacity of dichotomy:
The first step, hunting zone β
2∈ [0.5,0.7], β
2get minimum value-0.5 in hunting zone, record voltage magnitude is now V
1;
Second step, β
2get the maximum 0.7 in hunting zone, record voltage magnitude V now
2;
The 3rd step, voltage magnitude detects and decision circuit 105 compares V
1and V
2if, V
1be greater than V
2, the peak value of the voltage capacitor curve 111 shown in Fig. 5 is in the position of taking back so, and now constriction hunting zone is β
2∈ [0.5,0.1], with seasonal maximum amplitude V
max=V
1; If V
maxequal V
2, now constriction hunting zone is β
2∈ [0.1], with seasonal maximum amplitude V
max=V
1; If V
1be less than V
2, now constriction hunting zone is β
2∈ [0.1,0.7], with seasonal maximum amplitude V
max=V
2;
The 4th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get minimum value wherein, record voltage magnitude is now V
a;
The 5th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get median wherein, record voltage magnitude is now V
b;
The 6th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get maximum wherein, record voltage magnitude is now V
c;
The 7th step, makes the maximum amplitude V of this search
max=max(V
a, V
b, V
c), and by new β
2constriction scope changes to as β
2∈ [V
bcorresponding β
2value, max(V
a, V
c) corresponding β
2value];
Repeat the 4th step to the seven steps, until β
2span only till a remaining unique value, the β now obtaining
2, finalbe called the optimal coefficient after dichotomizing search, the capacitance C=C that it is corresponding
0(1+ β
2, final) be matching network adjustment and finish after, the capacitance network parameter of using during the real work of CLF chip.
Claims (4)
1. one kind is improved radio-frequency SIM card at the conforming device of different mobile phone performances, comprise antenna (101), non-contact front-end chip, referred to as CLF chip (102) and security module chip (103), it is characterized in that described CLF chip (102) comprises radio-frequency transmissions circuit (104), setting up impedance matching network (106) and voltage magnitude detects and decision circuit (105), described voltage magnitude detects and decision circuit (105) detects the output signal amplitude of described radio-frequency transmissions circuit (104), described impedance matching network (106) consists of equivalent electric capacity.
2. raising radio-frequency SIM card according to claim 1, in the conforming method of different mobile phone performances, is characterized in that series network, parallel network or series-parallel network that described impedance matching network (106) forms for electric capacity.
3. utilize the raising radio-frequency SIM card described in claim 1 or 2 at the conforming device of different mobile phone performances, to carry out the method for adjustment of consistency of performance, it is characterized in that voltage magnitude described after powering on detects and decision circuit (105) detects the amplitude of transmitting of the output of described radio-frequency transmissions circuit (104), the variation of judgement antenna sense value, and select suitable network parameter according to the actual sense value of antenna, using impedance matching network corresponding to amplitude maximum (106) parameter adaptively as final argument, make the maximizes power of radio-frequency transmissions circuit transmitting.
4. method according to claim 3, is characterized in that it is to adopt dichotomy automatic search optimum Match electric capacity that described voltage magnitude detection and decision circuit (105) are selected suitable network parameter according to the actual sense value of antenna, and concrete grammar is as follows:
The first step, hunting zone β
2∈ [0.5,0.7], β
2get minimum value-0.5 in hunting zone, record voltage magnitude is now V
1;
Second step, β
2get the maximum 0.7 in hunting zone, record voltage magnitude V now
2;
The 3rd step, voltage magnitude detects and decision circuit (105) compares V
1and V
2if, V
1be greater than V
2, the peak value of the voltage capacitor curve 111 shown in Fig. 5 is in the position of taking back so, and now constriction hunting zone is β
2∈ [0.5,0.1], with seasonal maximum amplitude V
max=V
1; If V
maxequal V
2, now constriction hunting zone is β
2∈ [0.1], with seasonal maximum amplitude V
max=V
1; If V
1be less than V
2, now constriction hunting zone is β
2∈ [0.1,0.7], with seasonal maximum amplitude V
max=V
2;
The 4th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get minimum value wherein, record voltage magnitude is now V
a;
The 5th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get median wherein, record voltage magnitude is now V
b;
The 6th step, according to the new β determining in the first step to the three steps
2hunting zone, β
2get maximum wherein, record voltage magnitude is now V
c;
The 7th step, makes the maximum amplitude V of this search
max=max(V
a, V
b, V
c), and by new β
2constriction scope changes to as β
2∈ [V
bcorresponding β
2value, max(V
a, V
c) corresponding β
2value];
Repeat the 4th step to the seven steps, until β
2span only till a remaining unique value, the β now obtaining
2, finalbe called the optimal coefficient after dichotomizing search, the capacitance C=C that it is corresponding
0(1+ β
2, final), C wherein
0for the fiducial value of electric capacity, be the capacitance network parameter of using when matching network adjustment finishes rear CLF chip real work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310595048.7A CN103595433B (en) | 2013-11-22 | 2013-11-22 | Improve radio-frequency SIM card conforming device and method of performance in different mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310595048.7A CN103595433B (en) | 2013-11-22 | 2013-11-22 | Improve radio-frequency SIM card conforming device and method of performance in different mobile phone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103595433A true CN103595433A (en) | 2014-02-19 |
| CN103595433B CN103595433B (en) | 2015-09-30 |
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ID=50085436
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195120A (en) * | 2010-03-16 | 2011-09-21 | 国民技术股份有限公司 | RF (radio frequency) IC (integrated circuit) card |
| CN102810177A (en) * | 2011-06-24 | 2012-12-05 | 深圳光启高等理工研究院 | SIM (subscriber identity module) card and radio frequency identification system thereof |
| CN202677443U (en) * | 2012-07-24 | 2013-01-16 | 东信和平科技股份有限公司 | Novel smart card capable of realizing 13.56 MHz communication |
| CN103164738A (en) * | 2013-02-06 | 2013-06-19 | 厦门盛华电子科技有限公司 | Mobile phone user identification card based on mobile payment multichannel digital certificate |
| CN203025754U (en) * | 2012-12-21 | 2013-06-26 | 北京握奇数据系统有限公司 | Mobile phone card with radio frequency identification function |
-
2013
- 2013-11-22 CN CN201310595048.7A patent/CN103595433B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195120A (en) * | 2010-03-16 | 2011-09-21 | 国民技术股份有限公司 | RF (radio frequency) IC (integrated circuit) card |
| CN102810177A (en) * | 2011-06-24 | 2012-12-05 | 深圳光启高等理工研究院 | SIM (subscriber identity module) card and radio frequency identification system thereof |
| CN202677443U (en) * | 2012-07-24 | 2013-01-16 | 东信和平科技股份有限公司 | Novel smart card capable of realizing 13.56 MHz communication |
| CN203025754U (en) * | 2012-12-21 | 2013-06-26 | 北京握奇数据系统有限公司 | Mobile phone card with radio frequency identification function |
| CN103164738A (en) * | 2013-02-06 | 2013-06-19 | 厦门盛华电子科技有限公司 | Mobile phone user identification card based on mobile payment multichannel digital certificate |
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| Publication number | Publication date |
|---|---|
| CN103595433B (en) | 2015-09-30 |
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