CN102073903A - Dual-interface SIM (subscriber identity module) card - Google Patents
Dual-interface SIM (subscriber identity module) card Download PDFInfo
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- CN102073903A CN102073903A CN201010570573XA CN201010570573A CN102073903A CN 102073903 A CN102073903 A CN 102073903A CN 201010570573X A CN201010570573X A CN 201010570573XA CN 201010570573 A CN201010570573 A CN 201010570573A CN 102073903 A CN102073903 A CN 102073903A
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Abstract
The invention provides a dual-interface SIM (subscriber identity module) card, which comprises an SIM card substrate, an SIM card chip with radio frequency identification function, a non-contact type antenna, and a contact type card metal contact, wherein the SIM card chip at least comprises a first antenna pin, a second antenna pin, a power pin, a reset pin, a clock pin, an IO (input/output) pin and a grounding pin, and is embedded inside the SIM card substrate; the non-contact type antenna is embedded inside the SIM card substrate and arranged on the same plane as the SIM card chip, and both ends of the non-contact type antenna are respectively connected with the first antenna pin and the second antenna pin of the SIM card chip; and the contact type card metal contact is correspondingly connected with the power pin, the reset pin, the clock pin, the IO pin and the grounding pin of the SIM card chip. The dual-interface SIM card made of the SIM card chip is used in the RFID (radio frequency identification) field together with mobile communication equipment, and realizes radio frequency identification applications, such as mobile payment, access control, and the like.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of double-interface SIM card.
Background technology
Comprise contactless integrated-circuit card (Integrated Circuit Card, be called for short IC-card) at interior REID (Radio Frequency Identification, hereinafter to be referred as RFID) technology is through the development of more than ten years, go deep into each corner of the modern life, be widely used in fields such as public transport, gate inhibition, doit electronic payment.REID is a kind of of automatic identification technology, and the composition of radio-frequency recognition system generally comprises two parts at least: (1) electronic tag, English name are Tag; (2) reader, English name is Reader, generally preserves the electronic data of agreement form in the electronic tag, in actual applications, electronic tag is attached to object surfaces to be identified.Reader is called readout device again, the electronic data that can contactlessly read and discern in the electronic tag to be preserved, thus reach the purpose of automatic recognition object.Further, by computing machine and computer network, can realize management functions such as collection, processing and teletransmission to object identification information.For most of rfid systems, will adopt a fixing frequency, and have a cover standard agreement to match with it.
Digital modulation technique is extensively adopted in the RFID field, as ASK, FSK and PSK modulation.The amplitude of amplitude keying (Amplitude Shift Keying is called for short ASK) i.e. by carrier wave is subjected to the modulation of numerical data and gets different values, for example corresponding Binary Zero, and carrier amplitude is 0; Corresponding binary one, carrier amplitude is 1.The amplitude modulation technology implements simply, but is subjected to the influence of change in gain easily.The frequency that frequency shift keying (Frequency Shift Keying is called for short FSK) is promptly pressed value (as the 0 or 1) modulated carrier of numerical data.For example the carrier frequency of corresponding Binary Zero is F1, and the carrier frequency of corresponding binary one is F2.This technology good in anti-interference performance, but occupied bandwidth is bigger.Phase-shift keying (PSK) (Phase Shift Keying is called for short FSK) is promptly pressed the value modulated carrier phase place of numerical data.For example represent 1, represent 0 with 0 phase shift with 180 phase shifts.This modulation technique interference free performance is best, and the variation of phase place also can be used as the clock that timing information comes control synchro and receiver, and transfer rate is played the effect that doubles.These several modulation systems all are existing ripe modulation techniques, are widely used in each communication system.
In recent years, under demands such as track traffic, logistics management, article anti-counterfeit, identification promoted, the RFID continuous advancement in technology was used more and more universally, and market presses for all kinds of RFID electronic tags and identification equipment.Generally there is a stored value card electronic tag inside, and the holder deposits certain amount of money in advance in electronic tag, directly deducts dealing money during transaction from stored value accounts.But the simple function electronic tag also has some shortcomings, supplements with money and must have no idea to be provided with password and RFID payment and mobile payment can't be combined etc. to the transaction of special voucher center, comparison wholesale such as: electronic tag.
And meanwhile, mobile communication terminal experiences more than 20 year developing rapidly, has almost become the portable device of consumer's staff indispensability, and popularity rate is very high, and integrated multi-purpose trend on portable terminal is arranged.Utilizing the mobile communications network of mobile phone itself such as GSM, CDMA etc. to pay is existing mature technology, but mobile phone and electronic tag are effectively combined, allowing mobile phone make things convenient for as mass transit card and using is the developing direction of present radio-frequency (RF) identification, also is the market that equipment supplier and mobile operator open up at present energetically.
Be subjected to the Japan and the influence of Korea S's mobile-phone payment, small amount payment is that the field that enters is expected always by operator.Since can be extraordinary for payment and on-site payment in real time provide solution, contactless close distance radio frequency identification has very wide application prospect, and will bring unprecedented opportunities for the mobile payment industry of present slower development.And will be the new developing direction in following 10 years in conjunction with a tractor serves several purposes of portable terminal and RFID technology or one card for multiple uses.Particularly in the 3G epoch, the ubiquitous rfid interrogator with wireless connections function and the RFID of contactless application will be the most important things of development.Industry mainly contains the solution of two covers based on non-contact technology at present: Combi SIM card scheme and near-field communication (NFC) scheme.
Combi SIM card scheme claims the double-interface SIM card scheme again, refers to replace the inner SIM card of mobile phone with the Combi SIM card, increases the contactless IC card application interface on the SIM card function basis that keeps former contact interface.More typical way has two kinds: one, the noncontact antenna of contactless IC card is printed on the plastic sheeting, is labelled to the SIM card surface again; Two, the noncontact antenna of contactless IC card as one independently parts be attached in the mobile phone, antenna is guided to the front or the reverse side of mobile phone, antenna is connected on the still untapped C4 of SIM card and two interfaces of C8.But the shortcoming of these two kinds of schemes is: antenna is attached to the SIM card surface or is drawn out to mobile phone front or reverse side, in installation process, be easy to cause a day thread breakage, damage, and cause the user to use inconvenience, owing to the shielding action of battery of mobile phone and circuit board, the signal of the reader that double-interface SIM card can be received and reflection give the signal of reader all very faint simultaneously.Therefore, the non-constant of the quality of communicating by letter between double-interface SIM card and the reader, reader almost can not receive replying that double-interface SIM card returns.
And the NFC scheme is a kind of new scheme that is proposed relevant radio-frequency (RF) identification in recent years by companies such as Nokia, Philips, basic way is to add the RFID module that is used to pay in newly-designed mobile phone, intercoms mutually with special communication protocol between RFID module and the mobile phone.This method can solve better utilizes mobile phone to carry out the problem of radio-frequency (RF) identification, but shortcoming is the user must remove to transform existing mobile phone, even buy a brand-new mobile phone, the method that this can both accept not all user of present stage, and also be the very big wasting of resources for entire society.
See also the inner structure synoptic diagram of Fig. 1 prior art typical case double-interface IC card and the RF interface circuit synoptic diagram of Fig. 2 prior art typical case double-interface IC card.The typical double-interface IC card chip structural drawing of releasing by Gemplus company as shown in Figure 1, contact part communication standard meets the ISO/IEC7816 standard, contactless part communication standard meets ISO/IEC 14443 TYPEA/TYPEB standards.This typical double-interface IC card chip is mainly by radio frequency (Radio Frequency, abbreviation RF) modules such as interface, central processing unit (Central Processing Unit is hereinafter to be referred as CPU), interrupt handler, randomizer, ROM (read-only memory) (being called for short ROM), EEPROM (being electric erasable read only storer able to programme), external RAM (being random access memory), cyclic redundancy check (CRC) (being called for short CRC) module, clock module, ISO/IEC7816 are formed.Wherein, the RF interface is the communication interface of double-interface IC card and 13.56MHz reader; CPU is finishing of the central processing unit of double-interface IC card and carrying out that in house software is mainly used in mobile communication together and the transaction of 13.56MHz reader; Interrupt handler is mainly used in the interruption of handling various peripheral hardwares; ROM is used to store inner firmware program; EEPROM and external RAM are used to store the data of double-interface IC card and intermediate variable etc.; The CRC module is used to produce cyclic redundancy check (CRC) code, guarantees the integrality of data in the communication process; Clock module is used for clock internal to be handled; The ISO/IEC7816 module is the communication interface of mobile phone and double-interface IC card, and is that mobile phone provides the passage of power supply to IC-card.
As shown in Figure 2, the RF interface mainly is made up of contactless antenna, demodulator circuit, digital quantization circuit and the modulation circuit of 13.56MHz.
The signal that reader is dealt into double-interface IC card receives by the 13.56MHz antenna, because it is the modulation signal of 100%ASK that reader is dealt into the signal of double-interface IC card, demodulator circuit adopts the mode of diode peak envelop detection to carry out demodulation in the double-interface IC card.After the detection output, signal will carry out becoming the required baseband signal of logical circuit after the quantification treatment through sample circuit, send CPU to handle again.
When double-interface IC card during to the reader answer signal, finish coding by CPU, and deliver to modulation circuit and modulate, finish the reflection of replying of signal by changing the pull-up resistor in the modulation circuit in the RF interface.
Because the shielding action of battery of mobile phone and circuit board, if double-interface IC card is replaced existing common SIM card and is applied in the mobile phone environment, double-interface IC card can't reliably be received the command signal that reader sends, the signal that the while double-interface IC card sends will significantly be decayed behind the mobile phone environment, and so little answer signal can't be received and be distinguished by reader.
Summary of the invention
The invention provides a kind of double-interface SIM card, comprising:
The SIM card base;
SIM card chip with radio frequency recognition function comprises first day wire pin, second day wire pin, power pins, reset pin, clock pin, IO pin and grounding pin at least, and described SIM card chip is embedded in described SIM card base inside;
Contactless antenna is embedded in described SIM card base inside, and is in same plane with described SIM card chip, and the two ends of described contactless antenna are connected with described second day wire pin with described first day wire pin of described SIM card chip respectively;
The contact card hard contact is with the corresponding connection of described power pins, reset pin, clock pin, IO pin and grounding pin of described SIM card chip.
SIM card with above-mentioned SIM card chip manufacturing both can be used as common single interface contact SIM card usefulness, also can be used as double-interface SIM card and mobile communication equipment one is used from the RFID field, realized applying in radio frequency identification such as mobile payment, gate inhibition's control.
Description of drawings
Fig. 1 is the inner structure synoptic diagram of prior art typical case double-interface IC card;
Fig. 2 is the RF interface circuit synoptic diagram of prior art typical case double-interface IC card;
Fig. 3 a comprises that the present invention has the structural representation of double-interface SIM card of the SIM card chip of radio frequency recognition function;
Fig. 3 b is the cut-open view of Fig. 3 a on the A-A direction;
Fig. 4 is that the present invention has a kind of embodiment synoptic diagram that the radio frequency interface unit in the SIM card chip of radio frequency recognition function cooperates with contactless antenna;
Fig. 5 a is a kind of example schematic of the reception amplifying circuit in the radio frequency interface shown in Figure 4 unit;
Fig. 5 b is a kind of example schematic of the reception amplifying circuit in the radio frequency interface shown in Figure 4 unit;
Fig. 6 a is a kind of example schematic of the demodulator circuit in the radio frequency interface shown in Figure 4 unit;
Fig. 6 b is the another kind of example schematic of the demodulator circuit in the radio frequency interface shown in Figure 4 unit;
Fig. 7 is a kind of example schematic of the transmitting power amplifying circuit in the radio frequency interface shown in Figure 4 unit.
Embodiment
The SIM chip that the present invention has a radio frequency recognition function comprises radio frequency interface unit, CPU, interrupt handler, randomizer, ROM, EEPROM, external RAM, cyclic redundancy check (CRC) module, clock module, ISO/IEC7816 module and power pins, reset pin, clock pin, first day wire pin, second day wire pin, IO pin, standby pin, grounding pin.
Comprise that contactless part communication met ISO/IEC 14443 standards, ISO/IEC 15693 standards or ISO11784/IS011785 standard when double-interface SIM card that the present invention has a SIM chip of radio frequency recognition function was used for the RFID field.
Shown in Fig. 3 a and Fig. 3 b, the contactless antenna 11 of described double-interface SIM card directly is embedded in SIM card base 13 inside, SIM card chip 12 is in same plane with this contactless antenna 11, and the two ends of this contactless antenna 11 are connected respectively on the first day wire pin in two contacts and second day wire pin of this SIM card chip 12.
Described SIM card chip 12 also comprises some gold threads, and each pin of SIM card chip 12 links to each other by the corresponding various piece of gold thread and contact card hard contact 14.The power supply of described double-interface SIM card is provided by mobile communication equipment (for example mobile phone), the power supply that is SIM card chip 12 is provided by mobile communication equipment, power supply, ground wire are received described power pins and grounding pin by contact card hard contact 14 and gold thread 151,152 respectively.
Communication interface between double-interface SIM card and the mobile communication equipment comprise in the SIM card chip 12 reset pin, clock pin and IO pin.Communication protocol is followed the ISO/IEC7816 standard.Mobile communication equipment provides reset signal by reset pin to double-interface SIM card; The clock of double-interface SIM card work is provided by the clock pin by mobile communication equipment; The data of serial communication are undertaken by the IO pin between double-interface SIM card and the mobile communication equipment.Standby pin generally need not when operate as normal.
With reference to shown in Figure 4, the radio frequency interface unit that the present invention has in the SIM card chip of radio frequency recognition function comprises: receive amplifying circuit 20, demodulator circuit 21, digital quantization circuit 22, modulation circuit 25, transmitting power amplifying circuit 26, wherein,
Receive amplifying circuit 20, be used for the signal of communication amplification that mobile phone is obtained and transfer to demodulator circuit 21;
Receive digital circuit interface 23, be used for the digital signal of digital quantization circuit 22 outputs is decoded according to the employing agreement, and be sent to the CPU in the SIM card chip;
Send digital circuit interface 24, be used for receiving the digital signal that SIM card chip CPU sends, and this digital signal carried out numerical coding, and the back signal of will encoding is delivered to modulation circuit 25 according to the employing agreement;
Transmitting power amplifying circuit 26 is used for the signal of communication through modulation circuit 25 modulation is amplified.
Wherein, described reception amplifying circuit 20 is via contactless antenna 27 picked up signal, and transmitting power amplifying circuit 26 sends via contactless antenna 27 after modulation signal is amplified.
Illustrate below by some above-mentioned radio frequency interface unit is further specified.
Because the differences such as installation site, mounting means and on every side mechanical metal environment of SIM card in various mobile phones, reader has different decay through the signal that battery of mobile phone, circuit board etc. pass to double-interface SIM card, so signal is delivered to the input end that receives amplifying circuit 20 via SIM card contactless antenna 27 suitable difference is arranged.On the other hand, receive the output terminal of amplifying circuit 20, i.e. the input end of demodulator circuit 21, wishing all has a stable signal to be demodulated to different mobile phone environments.Therefore, described reception amplifying circuit 20 except realizing the amplification of input signal, also should be able to be handled described input signal after obtaining input signal via contactless antenna 27, so that even the input signal amplitude of variation is very big, the amplitude of being exported through amplifying signal is also less.Thereby, provide demodulator circuit 21 1 stable signals to be demodulated.
Based on this, described reception amplifying circuit 20 can be automatic gain control circuit.Shown in Fig. 5 a, a kind of embodiment of described automatic gain control circuit can comprise: controllable gain amplifier 201, control signal generation circuit 202, comparer 203, level sensitive circuit 204.
Wherein, described controllable gain amplifier 201, the gain control signal that is used for sending according to control signal generation circuit 202 is determined corresponding gain, and exports demodulator circuit to after with this gain the ac input signal that is received being amplified;
Described level sensitive circuit 204 is used for the alternating current output signal of described controllable gain amplifier 201 outputs is converted to direct current signal, and is sent to comparer 203;
Described comparer 203 is used for direct current signal and reference signal that level sensitive circuit 204 sends are compared, and corresponding comparative result is sent to control signal generation circuit 202;
Described control signal generation circuit 202 is used for the comparative result that sends according to comparer 203, produces and sends corresponding gain control signal to described controllable gain amplifier 201.
Wherein, described direct current signal and reference signal are DC voltage.Described gain control signal can be control voltage.
Below further specify as follows to the course of work of above-mentioned automatic gain control circuit:
Described controllable gain amplifier 201 initially has a gain of presetting, and it can amplify this ac input signal with this gain of presetting behind the ac input signal that obtains contactless antenna 27 transmission.
Described level sensitive circuit 204 then can be converted to direct current signal with the AC signal after the amplification of described controlled increase amplifier 201 outputs.Described AC signal being converted to direct current signal herein is the comparison of comparer 203 for convenience.That is to say that after the direct current signal after level sensitive circuit 204 will be changed was sent to comparer 203, described comparer 203 just can compare direct current signal and the reference signal that is obtained easily.
For comparer 203, for example, when direct current signal and reference signal were DC voltage, described comparer 203 just can carry out the comparison of voltage.Specifically, during greater than the voltage of reference signal correspondence, the output direct current signal is greater than the comparative result of reference signal at the voltage of direct current signal correspondence; During less than the voltage of reference signal correspondence, the output direct current signal is less than the comparative result of reference signal at the voltage of direct current signal correspondence; When the voltage of direct current signal correspondence equaled the voltage of reference signal correspondence, the output direct current signal equaled the comparative result of reference signal.
And described control signal generation circuit 202 after obtaining the comparative result that comparer 203 sends, just can produce and to the corresponding gain control signal of controllable gain amplifier 201 transmissions.Specifically, when obtaining direct current signal, produce the control signal that gain increases less than the comparative result of reference signal; When obtaining direct current signal, produce the control signal that gain reduces greater than the comparative result of reference signal; When the acquisition direct current signal equals the comparative result of reference signal, produce and keep the constant control signal of gain.The mode that described gain control signal can be controlled voltage is sent to controllable gain amplifier 201, then described controllable gain amplifier 201 is after obtaining control voltage, just can be corresponding the increase gain, reduce gain or keep gain constant so that the amplification of ac input signal is produced corresponding change.
According to above explanation to described automatic gain control circuit as can be known, it can be according to the size of the ac input signal that is received and corresponding change gain, when ac input signal is big, reduces the amplification coefficient for ac input signal by reducing to gain; And at ac input signal hour, then by increasing amplification coefficient for ac input signal.Thereby, make under the bigger situation of the amplitude of variation of ac input signal, described controllable gain amplifier 201 still can output amplitude change more stable alternating current output signal, makes the demodulator circuit 21 that is positioned at described reception amplifying circuit 20 output terminals can obtain a stable signal input.
Shown in Fig. 5 b, the another kind of embodiment of described automatic gain control circuit can comprise: controllable gain amplifier 201, control signal generation circuit 202, comparer 203, level sensitive circuit 204 and low-pass filter 205.Wherein, described low-pass filter 205 is for the undesired signal in the direct current signal after 204 conversions of filtering level sensitive circuit, thereby provides comparer 203 1 direct current signals to be compared more accurately, makes that the control of reply gain is more accurate mutually.Other for example the explanation of gain amplifier 201, control signal generation circuit 202, comparer 203 and level sensitive circuit 204 can just repeat no more with reference to last example herein.
After receiving the ac input signal amplification of amplifying circuit 20 with contactless antenna 27 receptions, described demodulator circuit 20 will carry out demodulation with this amplifying signal.Described demodulator circuit 20 can adopt but be not limited to the existing demodulator circuit of realizing coherent demodulation method or irrelevant demodulation method.For example, for non-coherent demodulation method, can adopt non-coherent demodulation methods such as the demodulation of diode peak envelope, average envelope demodulation.Prior art can realize that the related circuit of relevant or irrelevant demodulation method all can be used as demodulator circuit 20 herein.
Fig. 6 a is depicted as a kind of simple and easy synoptic diagram of realizing the circuit of coherent demodulation method.Described demodulator circuit comprises multiplier 210, low-pass filter 211, through receiving the input signal Vi after amplifying circuit 20 amplifies, after the computing of local carrier signal via multiplier 210, after low-pass filter 211 filtering, generates demodulated output signal Vo.
Fig. 6 b is depicted as a kind of simple and easy synoptic diagram of circuit of the non-coherent demodulation method of realizing the demodulation of diode peak envelope.Described demodulator circuit comprises the resistance R that a capacitor C that detector diode 212, an end link to each other with detector diode 212 negative poles and an end link to each other with detector diode 212 negative poles, and described capacitor C and resistance R parallel connection.This demodulator circuit carries out the non-coherent demodulation of diode peak envelope demodulation behind receiving inputted signal Vi, and output demodulated output signal Vo.
Signal after demodulator circuit 20 demodulation then is converted to digital signal via digital quantization circuit 22.The simulating signal that described digital quantization circuit 22 can adopt analog to digital converter (being called for short ADC) or comparer (being Comparator) circuit that described demodulator circuit 20 is exported is converted into digital signal.
And after analog to digital conversion, receive digital circuit interface 23 just digital signal to be decoded according to the employing agreement, and deliver in the SIM card chip among the CPU.
And after sending digital circuit interface 24 digital signal that CPU sends in obtaining the SIM card chip, will carry out numerical coding according to the employing agreement, and coded signal is delivered to modulation circuit 25.
, will modulate via after sending digital circuit interface 24 acquisition corresponding signals at modulation circuit 25 to obtain to meet the modulation signal of communicating requirement.Described modulation circuit 25 can adopt but be not limited to have now the modulation circuit of realizing ASK or FSK or PSK.In addition, modulation circuit 25 is because adopt digital modulation technique, and for example ASK or PSK or FSK are so when modulating, it just can directly receive the digital signal that sends 24 transmissions of digital circuit interface.
And transmitting power amplifying circuit 26 then is used for the signal of communication through modulation circuit 25 modulation is amplified.Described transmitting power amplifying circuit 26 can adopt C class or D class power amplifier to realize, also can adopt other corresponding custom circuits.
Figure 7 shows that a kind of synoptic diagram of transmitting power amplifying circuit.Shown in amplifying circuit be a kind of high efficiency resonance power amplifier circuit, comprise: first to fourth phase inverter 261～264, the one PNP pipe Q3, the 2nd PNP manage Q5, the one NPN pipe Q4, the 2nd NPN manage Q6, first to the 3rd capacitor C 3～C5, first resistance R 11, second resistance R, 12, the first antenna load end ANT1, the second antenna load end ANT2.
Wherein, the input end of first phase inverter 261 receives the first modulated control signal RFTXD1, and output terminal links to each other with the base stage of the 2nd NPN pipe Q6.The input end of second phase inverter 262 receives the second modulated control signal RFTXD2, and output terminal links to each other with the base stage of the 2nd PNP pipe Q5.The input end of the 3rd phase inverter 263 receives the 3rd modulated control signal RFTXD3, and output terminal links to each other with the base stage of PNP pipe Q3.The input end of the 4th phase inverter 264 receives the 4th modulated control signal RFTXD4, and output terminal links to each other with the base stage of NPN pipe Q4.
The grounded collector of the 2nd PNP pipe Q5, emitter-base bandgap grading links to each other with the emitter-base bandgap grading of the 2nd NPN pipe Q6.The collector of the 2nd NPN pipe Q6 links to each other with VCC via first resistance R 11.The grounded collector of the one PNP pipe Q3, emitter-base bandgap grading links to each other with the emitter-base bandgap grading of NPN pipe Q4.The collector of the one NPN pipe Q4 links to each other with VCC via second resistance R 12.
First end of first capacitor C 3 links to each other with the emitter-base bandgap grading of the 2nd PNP pipe Q5 and the emitter-base bandgap grading of the 2nd NPN pipe Q6.First end of second capacitor C 4 links to each other with the emitter-base bandgap grading of PNP pipe Q3 and the emitter-base bandgap grading of NPN pipe Q4.The two ends of the 3rd capacitor C 5 link to each other with second end of first capacitor C 3 and second capacitor C 4 respectively.The two ends of the 3rd capacitor C 5 link to each other with the first antenna load end ANT1, the second antenna load end ANT2 respectively.
Above-mentioned amplifying circuit is by the switch control of RFTXD1, RFTXD2, these four modulated control signals of RFTXD3, RFTXD4, make NPN manage Q5, Q6, and PNP pipe Q3, Q4 replace opening/closing, thereby when amplifying, also make the antenna load end send the radiofrequency signal that meets frequency requirement for modulation signal.And RFTXD1, RFTXD2, these four modulated control signals of RFTXD3, RFTXD4 are produced by modulation circuit 25, RFTXD1/RFTXD2 is that the just in time opposite signal of phase place is right with RFTXD3/RFTXD4, phase place basically identical between RFTXD1 and the RFTXD2, phase place basically identical between RFTXD3 and the RFTXD4.
Can see illustrating of radio frequency interface unit by above, when the communicating by letter of mobile phone for example and reader, when reader when mobile phone sends command signal, radio frequency interface unit in the described SIM card chip obtains command signal via contactless antenna 27, after receiving amplifying circuit 20 amplifications, deliver to demodulator circuit 21 demodulation, and after demodulation obtains restituted signal, the restituted signal of simulation is converted to digital signal, and described digital signal is sent to the SIM card chip internal via receiving digital circuit interface 23 by digital quantization circuit 22.Owing to receive amplifying circuit 20 command signal that receives is amplified, compensated the decay of the shielding of battery of mobile phone and circuit board, make mobile phone can correctly obtain the command signal that reader sends command signal.
And when mobile phone during to the reader answer signal, after this answer signal is encoded through the CPU in the SIM card chip, after described modulation circuit 25 is modulated, deliver to described transmitting power amplifying circuit 26 and carry out power amplification, again by described contactless antenna 27 emissions.Because transmitting power amplifying circuit 26 is carried out power amplification with answer signal, has compensated the power attenuation of the shielding of battery of mobile phone and circuit board to answer signal, has improved the influence of fading of described shielding to answer signal.
Though the present invention discloses as above with preferred embodiment, the present invention is defined in this.Any those skilled in the art without departing from the spirit and scope of the present invention, all can do various changes and modification, so protection scope of the present invention should be as the criterion with claim institute restricted portion.
Claims (4)
1. a double-interface SIM card is characterized in that, comprising:
The SIM card base;
SIM card chip with radio frequency recognition function comprises first day wire pin, second day wire pin, power pins, reset pin, clock pin, IO pin and grounding pin at least, and described SIM card chip is embedded in described SIM card base inside;
Contactless antenna is embedded in described SIM card base inside, and is in same plane with described SIM card chip, and the two ends of described contactless antenna are connected with described second day wire pin with described first day wire pin of described SIM card chip respectively;
The contact card hard contact is with the corresponding connection of described power pins, reset pin, clock pin, IO pin and grounding pin of described SIM card chip.
2. double-interface SIM card according to claim 1, it is characterized in that, also comprise some gold threads, described contact card hard contact is by described power pins, reset pin, clock pin, IO pin and the grounding pin corresponding connection of described gold thread with described SIM card chip.
3. double-interface SIM card according to claim 2, it is characterized in that, described power pins is connected to the power supply of mobile communication equipment by described contact card hard contact and described gold thread, and described grounding pin is connected to the ground wire of mobile communication equipment by described contact card hard contact and described gold thread.
4. double-interface SIM card according to claim 1, it is characterized in that, described reset pin is used for being used for from described mobile communication equipment receive clock from mobile communication equipment reception reset signal, described clock pin, and described IO pin is used for carrying out data communication with described mobile communication equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010570573XA CN102073903A (en) | 2009-04-17 | 2009-04-17 | Dual-interface SIM (subscriber identity module) card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010570573XA CN102073903A (en) | 2009-04-17 | 2009-04-17 | Dual-interface SIM (subscriber identity module) card |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101353122A Division CN101561889B (en) | 2008-04-18 | 2009-04-17 | SIM card chip with radio frequency identification function |
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| CN102073903A true CN102073903A (en) | 2011-05-25 |
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| CN201010570573XA Pending CN102073903A (en) | 2009-04-17 | 2009-04-17 | Dual-interface SIM (subscriber identity module) card |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9686642B2 (en) | 2015-03-06 | 2017-06-20 | At&T Intellectual Property I, L.P. | Method and apparatus for providing location information for a wireless communication device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9686642B2 (en) | 2015-03-06 | 2017-06-20 | At&T Intellectual Property I, L.P. | Method and apparatus for providing location information for a wireless communication device |
| US10375510B2 (en) | 2015-03-06 | 2019-08-06 | At&T Intellectual Property I, L.P. | Method and apparatus for providing location information for a wireless communication device |
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Application publication date: 20110525 |