CN103530677A - Antenna amplitude limiting circuit of electronic tag in radio frequency system - Google Patents
Antenna amplitude limiting circuit of electronic tag in radio frequency system Download PDFInfo
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- CN103530677A CN103530677A CN201210225635.2A CN201210225635A CN103530677A CN 103530677 A CN103530677 A CN 103530677A CN 201210225635 A CN201210225635 A CN 201210225635A CN 103530677 A CN103530677 A CN 103530677A
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Abstract
The invention discloses an antenna amplitude limiting circuit of an electronic tag in a radio frequency system. The antenna amplitude limiting circuit consists of a first N-channel enhanced field effect transistor, a second N-channel enhanced field effect transistor, a first resistor, a second resistor, a third resistor, a fourth resistor resistance, a first capacitor and a second capacitor. Two terminals of the first resistor are respectively connected with a drain electrode of the first N-channel enhanced field effect transistor and the second resistor; and the second resistor and a drain electrode of the second N-channel enhanced field effect transistor are connected. The second capacitor is connected in series with the third resistor and the fourth resistor and then the series connection is connected with the first capacitor in parallel so as to form a series-parallel circuit; one terminal, provided with the third resistor, of the series-parallel circuit is connected with a circuit between the first resistor and the second resistor; and grid electrodes of the first N-channel enhanced field effect transistor and the second N-channel enhanced field effect transistor are connected with a circuit between the second capacitor and the fourth resistor. According to the scheme, the provided antenna amplitude limiting circuit with the simple structure can be realized conveniently; and when the voltage limiting of the antenna is realized, the power is not influenced.
Description
Technical field
The present invention relates to radio-frequency technique field, specifically the antenna amplitude limiter circuit of electronic tag in radio system.
Background technology
Radio-frequency (RF) identification is current application one of the most contactless Target Recognition, and it has the advantages such as noncontact, read-write is flexible, speed is fast, security is high, is therefore widely used in every field.Radio-frequency recognition system mainly comprises reader and electronic tag, the energy that electronic tag receives reader can be affected by the angle between operating distance and reader antenna, the voltage that electronic tag senses may be larger, so must there be independent modular circuit to realize amplitude limit, by limiting voltage within limits, breakdown to prevent receiving metal-oxide-semiconductor grid.The simplest directly measure of amplitude limit is to reduce coupling coefficient, people usually reduce coupling coefficient by the operating distance of adjustment reader and electronic tag or the input capacitance of adjustment electronic tag now, wherein, adopting the operating distance of adjustment reader and electronic tag is to be difficult to hold for operating personnel, and the method does not gear to actual circumstances; Change the input capacitance of electronic tag, be to change resonance frequency, reduce coupling coefficient, the power transmitting in electronic tag also can reduce, in large scale integrated circuit design, the realization of electric capacity can take larger chip area, and the parameter of electric capacity is floated relatively large.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of convenient operation to control, simple in structure, and when carrying out voltage amplitude limit, can not affect the antenna amplitude limiter circuit of electronic tag in the radio system of delivering power.
Object of the present invention is achieved through the following technical solutions: the antenna amplitude limiter circuit of electronic tag in radio system, comprise a N channel enhancement field effect transistor, the 2nd N channel enhancement field effect transistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity and the second electric capacity, the two ends of described the first resistance are connected with the second resistance with the drain electrode of a N channel enhancement field effect transistor respectively, the other end that the second resistance connects the first resistance terminal is relatively connected with the drain electrode of the 2nd N channel enhancement field effect transistor, the one N channel enhancement field effect transistor source electrode and the 2nd N channel enhancement field effect transistor source grounding, connect respectively and form connection in series-parallel circuit with the first Capacitance parallel connection after the 3rd resistance and the 4th resistance in described the second electric capacity two ends, this connection in series-parallel circuit is provided with one end of the 3rd resistance and the connection between the first resistance and the second resistance, its other end ground connection, the connection of the grid of a described N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor all and between the second electric capacity and the 4th resistance.
On circuit between described the first resistance and N channel enhancement field effect transistor drain electrode, be connected with the first antenna signal input part, on the circuit between the second resistance and the drain electrode of the 2nd N channel enhancement field effect transistor, be connected with the second antenna signal input part.The present invention, by the first antenna signal input part and the second antenna signal input part are set, is convenient to and external antenna.
Described the first resistance and the second resistance are adjustable resistance.The present invention can be by the resistance of the first resistance and the second resistance is regulated and controled to change limiting voltage of the present invention, thereby easy to operate while making the present invention change limiting voltage.
The present invention is when application, the first resistance, the second resistance and the first electric capacity are used for the radiofrequency signal of sampling, the one N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor are leak-off pipe, and a N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor are connected in parallel on antenna ends and carry out amplitude limit shunting.When the signal of sampling is during higher than datum, the electric current of the 4th resistance of flowing through increases, therefore the current potential of controlling a N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor grid improves, increase the ducting capacity of a N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor, the electric current of the N channel enhancement field effect transistor of flowing through and the 2nd N channel enhancement field effect transistor increases, reduce the service load of label antenna, thus the voltage amplitude of restriction aerial signal.The connection in series-parallel circuit that in the present invention, the 3rd resistance, the 4th resistance, the first electric capacity and the second electric capacity form is filter circuit, the conducting degree of this filter circuit feedback adjusting the one N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor, thus while guaranteeing that the present invention applies, voltage is stable.
Compared with prior art, the present invention has following beneficial effect: the present invention includes a N channel enhancement field effect transistor, the 2nd N channel enhancement field effect transistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first electric capacity and the second electric capacity, the present invention uses the quantity of electronic component few, one-piece construction is simple, while being integrated in module, volume is little, be convenient to realize, cost is low, and the present invention passes through to improve the grid voltage of a N channel enhancement field effect transistor and the second enhancement mode field effect transistor when application, can not exert an influence to power, at input voltage, make divided circuit conducting in parallel during higher than certain voltage value, make the electric current of circuit become large, thereby make voltage voltage stabilizing in certain scope.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
In accompanying drawing, the corresponding name of Reference numeral is called: N1-one N channel enhancement field effect transistor, N2-two N channel enhancement field effect transistor, C1-the first electric capacity, C2-the second electric capacity, R1-the first resistance, R2-the second resistance, R3-three resistance, R4-four resistance, Ant1-the first antenna signal input part, Ant2-the second antenna signal input part.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment:
As shown in Figure 1, the antenna amplitude limiter circuit of electronic tag in radio system, comprise a N channel enhancement field effect transistor N1, the 2nd N channel enhancement field effect transistor N2, the first resistance R 1, the second resistance N2, the 3rd resistance R 3, the 4th resistance R 4, the first capacitor C 1 and the second capacitor C 2, wherein, the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3 are adjustable resistance.The two ends of the first resistance R 1 are connected with the second resistance R 2 with the drain electrode of a N channel enhancement field effect transistor N1 respectively, the other end that the second resistance R 2 connects the first resistance R 1 end is relatively connected with the drain electrode of the 2nd N channel enhancement field effect transistor N2, a N channel enhancement field effect transistor N1 source electrode and the 2nd N channel enhancement field effect transistor N2 source grounding.Connect respectively after the 3rd resistance R 3 and the 4th resistance R 4 and the first capacitor C 1 formation in parallel connection in series-parallel circuit in the second capacitor C 2 two ends, this connection in series-parallel circuit is provided with one end of the 3rd resistance R 3 and the connection between the first resistance R 1 and the second resistance R 2, its other end ground connection.The connection of the grid of the one N channel enhancement field effect transistor N1 and the 2nd N channel enhancement field effect transistor N2 all and between the second capacitor C 2 and the 4th resistance R 4.
For the ease of external antenna, on circuit between the first resistance R 1 and N channel enhancement field effect transistor N1 drain electrode, be connected with the first antenna signal input part Ant1, on the circuit between the second resistance R 2 and the 2nd N channel enhancement field effect transistor N2 drain electrode, be connected with the second antenna signal input part Ant2.
As mentioned above, can well realize the present invention.
Claims (3)
1. the antenna amplitude limiter circuit of electronic tag in radio system, it is characterized in that: comprise a N channel enhancement field effect transistor (N1), the 2nd N channel enhancement field effect transistor (N2), the first resistance (R1), the second resistance (N2), the 3rd resistance (R3), the 4th resistance (R4), the first electric capacity (C1) and the second electric capacity (C2), the two ends of described the first resistance (R1) are connected with the second resistance (R2) with the drain electrode of a N channel enhancement field effect transistor (N1) respectively, the other end that the second resistance (R2) connects the first resistance (R1) end is relatively connected with the drain electrode of the 2nd N channel enhancement field effect transistor (N2), the one N channel enhancement field effect transistor (N1) source electrode and the 2nd N channel enhancement field effect transistor (N2) source grounding, connect respectively after the 3rd resistance (R3) and the 4th resistance (R4) and the first electric capacity (C1) formation in parallel connection in series-parallel circuit in described the second electric capacity (C2) two ends, this connection in series-parallel circuit is provided with one end of the 3rd resistance (R3) and the connection between the first resistance (R1) and the second resistance (R2), its other end ground connection, a described N channel enhancement field effect transistor (N1) and the connection of the 2nd both grids of N channel enhancement field effect transistor (N2) all and between the second electric capacity (C2) and the 4th resistance (R4).
2. the voltage amplitude limit module of antenna in radio-frequency recognition system according to claim 1, it is characterized in that: on the circuit between described the first resistance (R1) and a N channel enhancement field effect transistor (N1) drain electrode, be connected with the first antenna signal input part (Ant1), on the circuit between the second resistance (R2) and the drain electrode of the 2nd N channel enhancement field effect transistor (N2), be connected with the second antenna signal input part (Ant2).
3. the voltage amplitude limit module of antenna in radio-frequency recognition system according to claim 1 and 2, is characterized in that: described the first resistance (R1) and the second resistance (R2) are adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210225635.2A CN103530677A (en) | 2012-07-03 | 2012-07-03 | Antenna amplitude limiting circuit of electronic tag in radio frequency system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210225635.2A CN103530677A (en) | 2012-07-03 | 2012-07-03 | Antenna amplitude limiting circuit of electronic tag in radio frequency system |
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| CN103530677A true CN103530677A (en) | 2014-01-22 |
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| CN201210225635.2A Pending CN103530677A (en) | 2012-07-03 | 2012-07-03 | Antenna amplitude limiting circuit of electronic tag in radio frequency system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111264034A (en) * | 2017-10-25 | 2020-06-09 | 日本精机株式会社 | Receiving circuit and communication device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436261A (en) * | 2008-12-05 | 2009-05-20 | 华南理工大学 | 2.45 GHz semi-active radio frequency identification label and signal processing method thereof |
| CN202632345U (en) * | 2012-07-03 | 2012-12-26 | 成都市宏山科技有限公司 | Antenna amplitude-limit circuit for electronic tags in radio frequency system |
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2012
- 2012-07-03 CN CN201210225635.2A patent/CN103530677A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436261A (en) * | 2008-12-05 | 2009-05-20 | 华南理工大学 | 2.45 GHz semi-active radio frequency identification label and signal processing method thereof |
| CN202632345U (en) * | 2012-07-03 | 2012-12-26 | 成都市宏山科技有限公司 | Antenna amplitude-limit circuit for electronic tags in radio frequency system |
Non-Patent Citations (1)
| Title |
|---|
| 罗洋等: "UHF射频识别射频前端的分析与研究", 《2008年中国西部青年通信学术会议论文集》, 1 December 2008 (2008-12-01), pages 586 - 590 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111264034A (en) * | 2017-10-25 | 2020-06-09 | 日本精机株式会社 | Receiving circuit and communication device |
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Application publication date: 20140122 |