CN102054057B - Analog simulation method for RFID tag circuit - Google Patents
Analog simulation method for RFID tag circuit Download PDFInfo
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- CN102054057B CN102054057B CN200910201781A CN200910201781A CN102054057B CN 102054057 B CN102054057 B CN 102054057B CN 200910201781 A CN200910201781 A CN 200910201781A CN 200910201781 A CN200910201781 A CN 200910201781A CN 102054057 B CN102054057 B CN 102054057B
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- rfid tag
- tag circuit
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Abstract
The invention discloses an analog simulation method for a radio frequency identification (RFID) tag circuit. The method comprises that: a model of the RFID tag circuit receives a signal through an antenna to complete various simulation operations, a model of an amplitude modulator simulates a carrier of a modulation signal transmitted by a card reader and energy thereof, and the signal is coupled to the antenna of the RFID tag circuit from the amplitude modulator through a mutual inductance coefficient so as to simulate the magnitude of actual field intensity. By simulating the card reader to transmit the signal through the amplitude modulator and coupling the signal to a chip of the RFID tag circuit through the mutual inductance coefficient, a real working environment of the RFID tag circuit is simulated, and the RFID tag circuit is accurately simulated.
Description
Technical field
The present invention relates to a kind of emulation mode of semiconductor circuit, especially a kind of analog simulation method of RFID tag circuit.
Background technology
Existing rfid system comprises HF card reader and the label and the antenna composition of emission 13.56MHz signal; The carrier wave that has modulation signal of actual transmission is coupled from the antenna of card reader antenna through physical space and label; Label chip produces resonance through the antenna of oneself with inner electric capacity; The passive label chip takes out the power supply of energy as entire chip through rectifier, and the signal that card reader is sent is exported in the detuner demodulation of label chip simultaneously.The emission of label chip signal then is through changing the load on the antenna; Make that the amplitude of resonance changes on the label antenna; Through with the coupling of card reader antenna; Amplitude on the card reader antenna is also changed, accomplish the signal emission of label reading card device chip through signal amplification circuit on the card reader and signal read circuits.When carrying out emulation, how to realize that above-mentioned physical process needs modeling accurately and corresponding circuit design at design RFID tag circuit.The method that when the tag design chip carries out emulation, adopts at present is directly in plus signal source, the two ends of label antenna, and as shown in Figure 1, wherein V0～V4 is the Different control signal source, and S1～S4 is a perfect switch, and R1～R4 is the divider resistance of design.The shortcoming of existing analog simulation method is that the signal source that is loaded is constant; Its impedance does not change; As shown in Figure 2, this signal is a perfect sine wave, and the waveform that this and antenna ends form continuous variation of practical work process middle impedance is inconsistent; Also incomplete same with the actual physical situation of actual chips, the chip of design need repeatedly flow just can reach with actual test environment under data consistent.
Summary of the invention
Technical matters to be solved by this invention provides a kind of analog simulation method of RFID tag circuit, can simulate the real working environment of RFID tag circuit, accurately the RFID tag circuit is carried out emulation.
For solving the problems of the technologies described above; Technical scheme of the present invention is; The model of said RFID tag circuit is accomplished various simulation operations through antenna receiving signal; Adopt the carrier wave and the energy thereof of band modulation signal of the modeling card reader emission of amplitude modulator, and said signal is coupled to the antenna of RFID tag circuit through coefficient of mutual inductance from said amplitude modulator, simulate the size of actual field intensity.
The present invention sends signal through adopting amplitude modulator simulation card reader, and is coupled to the chip of RFID tag circuit through coefficient of mutual inductance, simulates the real working environment of RFID tag circuit, accurately the RFID tag circuit is carried out emulation.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the synoptic diagram of existing RFID tag circuit analog simulation;
Fig. 2 is the signal waveforms of existing RFID tag circuit analog simulation;
Fig. 3 is the synoptic diagram of RFID tag circuit analog simulation of the present invention;
Fig. 4 is the signal waveforms of RFID tag circuit analog simulation of the present invention.
Embodiment
The invention discloses a kind of analog simulation method of RFID tag circuit; The model of said RFID tag circuit is accomplished various simulation operations through antenna receiving signal; The present invention adopts the carrier wave and the energy thereof of band modulation signal of the modeling card reader emission of amplitude modulator; And said signal is coupled to the antenna of RFID tag circuit through coefficient of mutual inductance from said amplitude modulator, simulate the size of actual field intensity.
The RFID label principle of work of ISO14443 agreement defined is to adopt the inductance magnetic of card reader and label antenna to be coupled into row data communication, and as passive label, the label working dc power can obtain from card reader through the magnetic coupling of inductance.Card reader produces the strong-electromagnetic field of high frequency; The xsect of antenna and the space around the coil are passed in this magnetic field; Because wavelength ratio card reader antenna in the frequency range of using (13.56MHz) and the big manyfold of distance between the label can be used as simple alternating magnetic field to the electromagnetic field between the antenna and handle.High-frequency current flows through the card reader antenna inductance can produce magnetic field in the space; Be coupled in the antenna (inductance) on the label in this magnetic field; Produce mutual inductance; Be coupled on the label antenna through the current segment of this mutual inductance with reader, with the direct supply that just can be used as label behind this voltage commutation, the modulation demodulation that this voltage is contained comes out just can activate specific label or unit.The analog simulation method of RFID tag circuit of the present invention is as shown in Figure 3; The emission of signal is to realize through the behavioral scaling model that can adjust amplitude (AM) modulator of carrier frequency; The signal and the carrier signal of modulating signal source are modulated into the AM signal; The logical signal that the modulation of amplitude will be sent by card reader is controlled; The carrier wave of the band specifying information that produces carries out resonance through the antenna of a VCVS (VCVS) reading card device again; Simulate physical distance (also being the size of actual field intensity) and the size of energy between physical tags and the card reader through the coefficient of mutual inductance between reading card device antenna and RFID tag circuit antenna, the receiving end of label is near the energy that card reader sends that the 13.56MHz frequency, is coupled of the antenna through label then, and the encapsulated delivery through label chip is to the internal rectifier circuit of label; Fig. 4 is the inductive waveform figure of the present invention on label antenna; Its waveform no longer has been simple sine wave, but can change with changes in antenna impedance, actual conditions when reflecting the work of RFID tag circuit more true to nature.
Reading card device of the present invention adopts behavioral scaling model to build and touches; The carrier wave of output band modulation signal is converted to the antenna of voltage-controlled voltage source control card reader; Simulate the size of actual field intensity through the adjusting of coefficient of mutual inductance, receive the signal that card reader is sent through coupling to the label antenna inductance.Change the signal amplitude on the label chip antenna through changing the inner logic of label chip, the antenna of the card reader that is coupled is back again accomplished the back emitted of label reading card device signal.Practical implementation is to adopt the pulse-width signal of the signal employing HSPICE form that will send in the regular hour section, to be write as on the behavioral scaling Verilog model that logical signal is added to following AM (amplitude modulation(PAM)):
module?am_modulator(vin，vout)；
input?vin；
output?vout；
electrical?vin，vout；
parameter?real?f_carrier＝1M；
parameter?real?vin_max＝1；
parameter?real?vin_min＝-1；
parameter?real?mod_depth＝0.5from[0:1]；
parameter?real?unmod_amp＝2from(0:inf)；
real?vin_val，vin_adjusted；
real?vin_offset；
real?vin_scale；
real?w_carrier；
analog?begin
(?initial_step?)begin
vin_offset＝(vin_max+vin_min)/2；
vin_scale＝(vin_max-vin_min)/2；
w_carrier＝(2*`PI*f_carrier)；
if?(vin_max＜＝vin_min)begin
$display(″Range?specification?error.vin_max＝
(％E)less?than?vin_min＝(％E).\n″，vin_max，vin_min)；
$finish；
end
end
//
//clip?out?of?range?inputs
//
vin_val＝V(vin)＞vin_max?vin_max:V(vin)；
vin_val＝vin_val＜vin_min?vin_min:vin_val；
//
//adjust?the?input?for?modulation
//
vin_adjusted＝(vin_val-vin_offset)/vin_scale；
//
//generate?the?modulated?output
//
V(vout)＜+unmod_amp*(1+mod_depth*vin_adjusted)
*cos(w_carrier*$abstime)；
//
//to?ensure?at?least?25points?in?an?output?cycle
//
$bound_step(0.04/f_carrier)；
end
endmodule
Through it is set the frequency (being 13.56MHz) of carrier wave and the maximum/minimum radius and the depth of modulation of signal at present; Obtain containing the card reader output signal of carrier and modulating signal; Remove to control the antenna of card reader again through a VCCS, the actual signal of simulating actual card reader antenna emission is accomplished the emission of signal.The field intensity in actual physics space is then represented the intensity with the coupling of the antenna of label through the size of coefficient of mutual inductance M; Connect the parasitic model (containing lead-in inductance, lead resistance and stray capacitance) of actual chips encapsulation and the RFID label chip of follow-up design again, get into the radio frequency induction circuit part of label.Can simulate actual card reader through this whole complete system, the physical environment of the coupling of two antennas and RFID label and encapsulation is realized the two-way full emulation of communication, carries out the design and the diagnosis of RFID label chip.
In sum, the present invention sends signal through adopting amplitude modulator simulation card reader, and is coupled to the chip of RFID tag circuit through coefficient of mutual inductance, simulates the real working environment of RFID tag circuit, accurately the RFID tag circuit is carried out emulation.
Claims (1)
1. the analog simulation method of a RFID tag circuit; The model of said RFID tag circuit is accomplished various simulation operations through antenna receiving signal; It is characterized in that; Adopt the carrier wave and the energy thereof of band modulation signal of the modeling card reader emission of amplitude modulator, and said signal is coupled to the antenna of RFID tag circuit through coefficient of mutual inductance from said amplitude modulator, simulate the size of actual field intensity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910201781A CN102054057B (en) | 2009-11-09 | 2009-11-09 | Analog simulation method for RFID tag circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910201781A CN102054057B (en) | 2009-11-09 | 2009-11-09 | Analog simulation method for RFID tag circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102054057A CN102054057A (en) | 2011-05-11 |
| CN102054057B true CN102054057B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910201781A Active CN102054057B (en) | 2009-11-09 | 2009-11-09 | Analog simulation method for RFID tag circuit |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10289142B2 (en) | 2011-02-01 | 2019-05-14 | Fu Da Tong Technology Co., Ltd. | Induction type power supply system and intruding metal detection method thereof |
| US10038338B2 (en) | 2011-02-01 | 2018-07-31 | Fu Da Tong Technology Co., Ltd. | Signal modulation method and signal rectification and modulation device |
| US10951063B2 (en) | 2011-02-01 | 2021-03-16 | Fu Da Tong Technology Co., Ltd. | Supplying-end module of induction type power supply system and signal detection method thereof |
| US10312748B2 (en) | 2011-02-01 | 2019-06-04 | Fu Da Tong Techology Co., Ltd. | Signal analysis method and circuit |
| TWI663806B (en) * | 2018-02-12 | 2019-06-21 | 富達通科技股份有限公司 | Supplying-end module of induction type power supply system and signal detection method using the same |
| US11128180B2 (en) | 2011-02-01 | 2021-09-21 | Fu Da Tong Technology Co., Ltd. | Method and supplying-end module for detecting receiving-end module |
| TWI596546B (en) * | 2013-06-28 | 2017-08-21 | 微科電子有限公司 | Rfid card learning apparatus, wearable produc and operating method thereof |
| CN104331568A (en) * | 2014-11-12 | 2015-02-04 | 广州中大微电子有限公司 | Method for implementing RFID (radio frequency identification) field strength simulation model |
| CN112598094A (en) * | 2020-12-10 | 2021-04-02 | 湖北文理学院 | Short-distance communication system and communication method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293788A (en) * | 1998-12-23 | 2001-05-02 | 密克罗奇普技术公司 | Radio frequency identification security system having RF emulating circuit |
| CN2898946Y (en) * | 2005-12-14 | 2007-05-09 | 深圳市远望谷信息技术股份有限公司 | Dynamic inspector of automatic distinguisher |
-
2009
- 2009-11-09 CN CN200910201781A patent/CN102054057B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293788A (en) * | 1998-12-23 | 2001-05-02 | 密克罗奇普技术公司 | Radio frequency identification security system having RF emulating circuit |
| CN2898946Y (en) * | 2005-12-14 | 2007-05-09 | 深圳市远望谷信息技术股份有限公司 | Dynamic inspector of automatic distinguisher |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102054057A (en) | 2011-05-11 |
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Owner name: SHANGHAI HUAHONG GRACE SEMICONDUCTOR MANUFACTURING Free format text: FORMER OWNER: HUAHONG NEC ELECTRONICS CO LTD, SHANGHAI Effective date: 20140108 |
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Effective date of registration: 20140108 Address after: 201203 Shanghai city Zuchongzhi road Pudong New Area Zhangjiang hi tech Park No. 1399 Patentee after: Shanghai Huahong Grace Semiconductor Manufacturing Corporation Address before: 201206, Shanghai, Pudong New Area, Sichuan Road, No. 1188 Bridge Patentee before: Shanghai Huahong NEC Electronics Co., Ltd. |