CN103595433B - Improve radio-frequency SIM card conforming device and method of performance in different mobile phone - Google Patents
Improve radio-frequency SIM card conforming device and method of performance in different mobile phone Download PDFInfo
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- CN103595433B CN103595433B CN201310595048.7A CN201310595048A CN103595433B CN 103595433 B CN103595433 B CN 103595433B CN 201310595048 A CN201310595048 A CN 201310595048A CN 103595433 B CN103595433 B CN 103595433B
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Abstract
A kind of raising radio-frequency SIM card conforming device of performance in different mobile phone, 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 transmitter circuitry, set up impedance matching network and voltage magnitude to detect and decision circuit, described voltage magnitude detects and the output signal amplitude of decision circuit to described radio frequency transmitter circuitry detects, and described impedance matching network is made up of the electric capacity of equivalence.The present invention increases the impedance matching network formed with capacitor array form in CLF chip, increase automatic detection circuit, by the amplitude detection that transmits after powering on, using network parameter corresponding to Amplitude maxima as final argument, the transmitting power of radio frequency transmitter circuitry in different mobile phone is adjusted to maximum, thus reduces the impact that mobile phone environment changes radio frequency SIM card performance for wireless communications.
Description
Technical field
The present invention relates to radio-frequency SIM card, particularly a kind of raising radio-frequency SIM card conforming method of performance in different mobile phone.
Technical background
Mobile phone radio frequency SIM card is a kind of SIM card can carrying out mobile payment, and the function of its existing SIM card, can realize wireless near field communication again.It can the function such as integrated mass transit card, bank card and access card, and part payment daily life is served, and facilitates citizens' activities to do shopping.In recent years, mobile phone radio frequency SIM card develops very fast at home, and after the middle mobile 2.4G Payment Card released, present operator and Unionpay are proposed again the radio-frequency SIM card of a series of 13.56MHz.
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 (SecurityElement, referred to as SE) chip 103.SE chip 103 and CLF chip 102 process the instruction received by antenna 101, and result is returned to by antenna 101 again.
The limited area of SIM cards of mobile phones, it is a very large challenge that a little area makes an antenna 101 that can adapt to a lot of mobile phone environment, 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 cell phone back cover, the factors such as the 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 the change of antenna 101 inductance value.When same radio-frequency SIM card is placed in different mobile phones, the intensity of variation of its antenna 101 inductance value is maximum can reach more than 2 times.
When the change of antenna 101 inductance value, by
the resonance frequency change determined, thus cause the radio-frequency SIM card meeting condition of resonance in part mobile phone, in other mobile phones, impedance matching sharply worsens, and has a strong impact on signal transmitting and receiving.When finally causing radio-frequency SIM card to be applied in different mobile phone, consistency of performance is deteriorated, and 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 and improve radio-frequency SIM card conforming method of performance in different mobile phone, overcomes the impact of SIM antenna inductance value change radio frequency radiating circuit transmitting power.
Technical solution of the present invention is as follows:
A kind of raising radio-frequency SIM card conforming device of performance in different mobile phone, 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 transmitter circuitry, set up impedance matching network and voltage magnitude to detect and decision circuit, described voltage magnitude detects and the output signal amplitude of decision circuit to described radio frequency transmitter circuitry detects, and described impedance matching network is made up of the electric capacity of equivalence.
Described impedance matching network is series network, parallel network or the series-parallel network that electric capacity forms.
Voltage magnitude described after powering on detects and the transmit amplitude of decision circuit to the output of described radio frequency transmitter circuitry detects, judge the change of antenna inductance value, and select suitable network parameter according to the actual inductance value of antenna, adaptively using impedance matching network parameter corresponding to Amplitude maxima as final argument, make the maximizes power that radio frequency transmitter circuitry is launched.
Described voltage magnitude detects and decision circuit selects suitable network parameter to be adopt dichotomy automatic search optimum Match electric capacity according to the actual inductance value of antenna, and concrete grammar is as follows:
The first step, hunting zone β
2∈ [-0.5,0.7], β
2get the 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;
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 so shown in Fig. 5 is in position to the left, 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;
4th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get minimum value wherein, record voltage magnitude is now V
a;
5th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get median wherein, record voltage magnitude is now V
b;
6th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get maximum wherein, record voltage magnitude is now V
c;
7th step, the maximum amplitude V making this search for
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 to β
2value];
Repeat the 4th step to the 7th step, until β
2span only till a remaining unique value, the β now obtained
2, finalbe called the optimal coefficient after dichotomizing search, the capacitance C=C of its correspondence
0(1+ β
2, final), wherein C
0for the fiducial value of electric capacity, be the capacitance network parameter used when matching network adjustment terminates 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 transmitter circuitry and voltage magnitude detect and decision circuit.
Described impedance matching network, whole impedance matching network circuit selects capacitance group to become series network, parallel network by control switch, 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 inductance value and electric capacity have relation.
Described radio frequency transmitter circuitry comprises reference clock, and Part II is the drive circuit of frequency synthesizer and radio frequency transmitter circuitry.This three partial circuit is all custom circuit.When radio-frequency SIM card normally 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 paid close attention to when the frequency of frequency synthesizer output clock depends on that radio-frequency SIM card communicates.
Described voltage magnitude detects and the operation principle of decision circuit is exactly relatively 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 formed with capacitor array form in CLF chip, increase automatic detection circuit, by the amplitude detection that transmits after powering on, using network parameter corresponding to Amplitude maxima as final argument, the transmitting power of radio frequency transmitter circuitry in different mobile phone is adjusted to maximum, thus reduces the impact that mobile phone environment changes 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 transmitter circuitry;
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.Assuming that under ecotopia, the basic inductance value of antenna is L
0, so, when mobile phone environment changes, the inductance 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, the inductance value L of antenna 101 there occurs the change of 2 times, and the electric capacity C in matching network circuit 107 needs have the excursion of more than 2 times could compensate the change of antenna inductance value accordingly.The fiducial value of record electric capacity is C
0, capacitance C=C
0(1+ β 2), β
2∈ [-0.5,0.7].In this specific embodiment, see Fig. 3, matching network circuit 107 use 32 electric capacity C1, C2 ... C32 forms array, and adjusting range is each time reference capacitance value C
03.75%.
In the present embodiment, voltage magnitude detection and decision circuit 105 are 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 the 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;
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 so shown in Fig. 5 is in position to the left, 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;
4th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get minimum value wherein, record voltage magnitude is now V
a;
5th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get median wherein, record voltage magnitude is now V
b;
6th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get maximum wherein, record voltage magnitude is now V
c;
7th step, the maximum amplitude V making this search for
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 to β
2value];
Repeat the 4th step to the 7th step, until β
2span only till a remaining unique value, the β now obtained
2, finalbe called the optimal coefficient after dichotomizing search, the capacitance C=C of its correspondence
0(1+ β
2, final) be matching network adjustment terminate after, the capacitance network parameter used during the real work of CLF chip.
Claims (1)
1. one kind utilizes raising radio-frequency SIM card conforming device of performance in different mobile phone to carry out the conforming method of adjustment of performance, this device comprises antenna (101), non-contact front-end chip, referred to as CLF chip (102) and security module chip (103), described CLF chip (102) comprises radio frequency transmitter circuitry (104), set up impedance matching network (106) and voltage magnitude to detect and decision circuit (105), described voltage magnitude detects and the output signal amplitude of decision circuit (105) to described radio frequency transmitter circuitry (104) detects, described impedance matching network (106) is made up of the electric capacity of equivalence, it is characterized in that, voltage magnitude described after powering on detects and the transmit amplitude of decision circuit (105) to the output of described radio frequency transmitter circuitry (104) detects, judge the change of antenna inductance value, and select suitable network parameter according to the actual inductance value of antenna, adaptively using impedance matching network (106) parameter corresponding to Amplitude maxima as final argument, make the maximizes power that radio frequency transmitter circuitry is launched
Described voltage magnitude detects and decision circuit (105) selects suitable network parameter to be adopt dichotomy automatic search optimum Match electric capacity according to the actual inductance value of antenna, and concrete grammar is as follows:
The first step, hunting zone β
2∈ [-0.5,0.7], β
2get the 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;
3rd step, voltage magnitude detects and decision circuit (105) compares V
1and V
2if, V
1be greater than V
2, 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;
4th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get minimum value wherein, record voltage magnitude is now V
a;
5th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get median wherein, record voltage magnitude is now V
b;
6th step, according to the new β determined in the first step to the 3rd step
2hunting zone, β
2get maximum wherein, record voltage magnitude is now V
c;
7th step, the maximum amplitude V making this search for
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 to β
2value];
Repeat the 4th step to the 7th step, until β
2span only till a remaining unique value, the β now obtained
2, finalbe called the optimal coefficient after dichotomizing search, the capacitance C=C of its correspondence
0(1+ β
2, final), wherein C
0for the fiducial value of electric capacity, be the capacitance network parameter used when matching network adjustment terminates 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 CN103595433A (en) | 2014-02-19 |
| CN103595433B true CN103595433B (en) | 2015-09-30 |
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ID=50085436
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310595048.7A Active CN103595433B (en) | 2013-11-22 | 2013-11-22 | Improve radio-frequency SIM card conforming device and method of performance in different mobile phone |
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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 |
|---|---|
| CN103595433A (en) | 2014-02-19 |
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