CN101083479B - Signal receiving and transmitting device and method for preventing saturation of receiving end - Google Patents
Signal receiving and transmitting device and method for preventing saturation of receiving end Download PDFInfo
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- CN101083479B CN101083479B CN2006100832925A CN200610083292A CN101083479B CN 101083479 B CN101083479 B CN 101083479B CN 2006100832925 A CN2006100832925 A CN 2006100832925A CN 200610083292 A CN200610083292 A CN 200610083292A CN 101083479 B CN101083479 B CN 101083479B
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Abstract
The invention discloses a signal receiving and transmitting circuit and the operating method thereof, and it comprises a signal receiving unit, a first signal generating unit and a second signal generating unit, where the signal receiving unit receives a first signal and a second signal; the first signal generating unit is used to generate the first signal; and the second signal generating unit is coupled to the signal receiving unit to generate the second signal, where the first and second signals have a phase difference to make them have mutual weakening effect in the signal receiving unit.
Description
Technical field
The present invention relates to a kind of signal receiving/transmission device and method, relate in particular to a kind of signal receiving/transmission device and method that can prevent that receiving terminal is saturated.
Background technology
As shown in Figure 1, Fig. 1 is the application circuit of identification technique in wireless radio frequency (RFID).Read-write equipment (RFIDreader) 100 includes receiving circuit 130, demodulator 140, treatment circuit 150, modulator 160, oscillator 170 and power amplifier 180, wherein receiving circuit 130 comes received signal by antenna 110, and power amplifier 180 transmits by antenna 120.When read-write equipment 100 will transmit to distinguishing mark (RFID tag) 200, the oscillator signal that modulator 160 comes modulation to be produced by oscillator 170 according to the control signal of treatment circuit 150, the signal behind the modulation are launched via antenna 120 after amplifying by power amplifier 180.Distinguishing mark 200 receives the radiofrequency signal RF1 that is launched by antenna 120, after finishing dealing with, reflects another reflected signal RF2 to read-write equipment 100.Reflected signal RF2 is sent to antenna 110 and is received by receiving circuit 130, separates after the modulation through demodulator 140, transfers to treatment circuit 150 again and does follow-up data processor.Only be sent to distinguishing mark 200 under the signal ideal state of being launched by antenna 120, but in fact but can some radiofrequency signal RF3 directly leak to antenna 110 from antenna 120.Because the signal after power amplifier 180 amplifies often has bigger energy (for example 30dBm), the isolation between antennas of receiving terminal (antenna isolation) is if not high enough (for example 25 ~ 30dB), then receiving circuit 130 receives the state that reaches capacity easily after this kind signal, the less relatively reflected signal RF2 of received energy (for example-80dBm), causes the system can't operate as normal again.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of signal reception and radiating circuit and method of operation thereof, by producing an extra signal to receiving terminal, utilize this signal to come to reach the effect that weakens mutually with leaking by transmitting terminal to the signal of receiving terminal, receiving terminal just can not be subjected to the influence of leakage signal energy and enter saturation condition, so circuit can be kept operate as normal.
For achieving the above object, the invention provides a kind of saturated signal of receiving terminal that prevents and receive and radiating circuit, include a signal receiving unit, one first signal generation unit and a secondary signal generation unit.This signal receiving unit receives one first signal and a secondary signal; This first signal generation unit is used for producing this first signal; And this secondary signal generation unit is coupled to this signal receiving unit, be used for producing this secondary signal, this secondary signal and this first signal have a phase difference, so that this first signal and this secondary signal produce the effect that weakens mutually in this signal receiving unit.This signal receives and radiating circuit also comprises one first oscillator, is coupled to this first signal generation unit, is used for producing one first oscillator signal, and this this first oscillator signal of first signal generation unit modulation produces this first signal; And one second oscillator, be coupled to this secondary signal generation unit, be used for producing one second oscillator signal, this this second oscillator signal of secondary signal generation unit modulation produces this secondary signal.
And for achieving the above object, the present invention discloses a kind of method that receives and transmit in addition, is applied to a signal and receives and radiating circuit, prevents that this signal from receiving and the receiving terminal of radiating circuit is saturated, and it includes: produce one first signal; Produce a secondary signal; And this first signal and this secondary signal inputed to a signal receiving unit, this secondary signal and this first signal have a phase difference, so that this first signal and this secondary signal produce the effect that weakens mutually in this signal receiving unit; Produce one first oscillator signal, wherein this first oscillator signal of this first modulating signal and producing; And produce one second oscillator signal, this second oscillator signal of this secondary signal modulation and producing wherein.
The present invention discloses a kind of read-write equipment of radio frequency identification sign in addition, and it includes: a receiving circuit, an oscillator, one first modulator, a power amplifier and one second modulator.This receiving circuit receives one first signal and a secondary signal; This oscillator is used for producing an oscillator signal; This first modulator is coupled to this oscillator, be used for this oscillator signal of modulation with produce this first signal and not this oscillator signal of modulation to produce a radiofrequency signal that does not contain instruction; This power amplifier is coupled to this first modulator, is used for amplifying this first signal and this radiofrequency signal; And this second modulator is coupled to this oscillator and this receiving circuit, be used for this oscillator signal of modulation to produce this secondary signal, this secondary signal and this radiofrequency signal have a phase difference, so that this radiofrequency signal and this secondary signal produce the effect that weakens mutually in this receiving circuit.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the application circuit of identification technique in wireless radio frequency;
Fig. 2 prevents the first embodiment schematic diagram of the signal receiving/transmission device that receiving terminal is saturated for the present invention;
Fig. 3 prevents the second embodiment schematic diagram of the signal receiving/transmission device that receiving terminal is saturated for the present invention.
100,300,400: read-write equipment
110,120: antenna
130: receiving circuit
140: demodulator
150: treatment circuit
160,310: modulator
170,320: oscillator
180: power amplifier
200: distinguishing mark
305,405: signal receives and radiating circuit
Embodiment
In the middle of specification and follow-up claim, used some vocabulary to censure specific element.Those skilled in the art should understand, and hardware manufacturer may be called same element with different nouns.This specification and follow-up claim are not used as distinguishing the mode of element with the difference of title, but the criterion that is used as distinguishing with the difference of element on function.Be an open term mentioned [comprising] in the middle of specification and the follow-up request item in the whole text, so should be construed to [comprise but be not limited to].In addition, [couple] speech and comprise any indirect means that are electrically connected that directly reach at this.Therefore, be coupled to one second device, then represent this first device can directly be electrically connected in this second device, or be electrically connected to this second device indirectly by other device or connection means if describe one first device in the literary composition.
As shown in Figure 2, Fig. 2 prevents the first embodiment schematic diagram of the signal receiving/transmission device that receiving terminal is saturated for the present invention.Read-write equipment 300 includes receiving circuit 130, demodulator 140, treatment circuit 150, modulator (modulator) 160, oscillator 170, power amplifier 180 and modulator 310, wherein receiving circuit 130 comes received signal by antenna 110, power amplifier 180 transmits by antenna 120, and receiving circuit 130, modulator 160, oscillator 170, power amplifier 180 and modulator 310 constitute signal reception of the present invention and radiating circuit 305.In the read-write equipment 300 with read-write equipment 100 in the numbering components identical have same function, read-write equipment 300 is with the difference of read-write equipment 100, has a modulator 310 in the read-write equipment 300, be coupled to receiving circuit 130, be used for the oscillator signal that modulation oscillator 170 produces, signal Sc in the mode of wire transmission, sends the signal Sc behind the modulation to receiving circuit 130 then, so that can produce the effect that weakens mutually with radiofrequency signal RF3.For instance, the oscillator signal that oscillator 170 is produced is with cos (w
cT+ φ) expression, when read-write equipment 300 wanted transfer instruction to give distinguishing mark 200, wherein a kind of mode was to utilize modulator 160 that the oscillator signal modulation is become A
1Cos (w
mT) cos (w
cT+ φ) form is passed on instruction, this moment distinguishing mark 200 as yet not reflective signal RF2 to antenna 110.When read-write equipment 300 has been launched instruction to behind the distinguishing mark 200, just modulating signal no longer of modulator 160 this moment, and in order to allow distinguishing mark 200 continue running, the radiofrequency signal that the only lasting emission of read-write equipment 300 provides energy merely will not contain the radiofrequency signal of instruction with A to distinguishing mark 200
2Cos (w
cT+ φ) form is represented, and this moment, receiving circuit 130 just began to prepare to receive reflected signal RF2.On the other hand, saturated in order to prevent receiving circuit 130, can come the modulation oscillator signal by control modulator 310, make signal Sc and radiofrequency signal RF3 that same frequency and phase difference 180 degree be arranged, the amplitude of modulation oscillator signal suitably again, so that the amplitude of the amplitude convergence radiofrequency signal RF3 of signal Sc, then in receiving circuit 130 received RF signal RF3 and signal Sc, because phase difference and relationship of amplitude produce the effect that weakens mutually between two signals, thus, receiving circuit 130 just can not cause saturated because of the too big RF3 signal of received energy.Therefore, wherein a kind of modulation mode of modulator 310 is amplitude and the phase places that change oscillator signal, the signal Sc behind the modulation can with
Expression, wherein
Then signal Sc can be expressed as follows:
Receiving circuit 130 is received RF signal RF3 and signal Sc simultaneously:
signal_in＝A
2cos(w
ct+φ)-Bcos(w
ct+φ)
＝(A
2-B)cos(w
ct+φ)
Can find by following formula, can suppress the amplitude of radiofrequency signal RF3, leak to the energy of antenna 110 by antenna 120 to cut down directly by the amplitude B of modulating signal Sc suitably.One of main purpose of modulator 310 is the phase place that is used for changing oscillator signal, its implementation method has many kinds, and mode generally speaking commonly used is to utilize the resistance series capacitance or utilize the inductance series capacitance that signal is produced to postpone to reach the purpose of change phase place.
As shown in Figure 3, Fig. 3 prevents the second embodiment schematic diagram of the signal receiving/transmission device that receiving terminal is saturated for the present invention.Read-write equipment 400 includes receiving circuit 130, demodulator 140, treatment circuit 150, modulator 160, oscillator 170, power amplifier 180, modulator 310 and oscillator 320, wherein receiving circuit 130 comes received signal by antenna 110, power amplifier 180 transmits by antenna 120, and receiving circuit 130, modulator 160, oscillator 170, oscillator 320, power amplifier 180 and modulator 310 constitute signal reception of the present invention and radiating circuit 405.In the read-write equipment 400 with read-write equipment 300 in the numbering components identical have same function, read-write equipment 400 is with the difference of read-write equipment 300, many oscillators 320 in the read-write equipment 400, itself and oscillator 170 shared same reference sources make both synchronous.Oscillator 320 is coupled to modulator 310, is used for producing another oscillator signal that is different from the oscillator signal that oscillator 170 produced.Oscillator signal called after first oscillator signal that oscillator 170 is produced, oscillator signal called after second oscillator signal that oscillator 320 is produced, modulator 310 modulations second oscillator signal then, then in the mode of wire transmission, signal Sc sends the signal Sc behind the modulation to receiving circuit, so that can produce the effect that weakens mutually with radiofrequency signal RF3.The frequency and the phase place of modulator 310 main modulation second oscillator signals make the frequency of signal Sc be close with radiofrequency signal or equate, and allow signal Sc and radiofrequency signal RF3 phase difference 180 degree.For instance, first oscillator signal that oscillator 170 and oscillator 320 are produced and second oscillator signal are with cos (w
cT+ φ) expression, when read-write equipment 400 wanted transfer instruction to give distinguishing mark 200, wherein a kind of mode was to utilize modulator 160 that the oscillator signal modulation is become A
1Cos (w
mT) cos (w
cT+ φ) form is passed on instruction, this moment distinguishing mark 200 as yet not reflective signal RF2 to antenna 110.When read-write equipment 400 has been launched instruction to behind the distinguishing mark 200, just modulating signal no longer of modulator 160 this moment, and in order to allow distinguishing mark 200 continue running, the radiofrequency signal that the only lasting emission of read-write equipment 400 provides energy merely will not contain the radiofrequency signal of instruction with A to distinguishing mark 200
2Cos (w
cT+ φ) form is represented, and this moment, receiving circuit 130 just began to prepare to receive reflected signal RF2.On the other hand, saturated in order to prevent receiving circuit 130, can come modulation second oscillator signal by control modulator 310, make signal Sc and radiofrequency signal RF3 that same frequency and phase difference 180 degree be arranged, the amplitude of modulation second oscillator signal suitably again, so that the amplitude of the amplitude convergence radiofrequency signal RF3 of signal Sc, then in receiving circuit 130 received RF signal RF3 and signal Sc, because phase difference and relationship of amplitude produce the effect that weakens mutually between two signals, thus, receiving circuit 130 just can not cause saturated because of the too big RF3 signal of received energy.Therefore, wherein a kind of modulation mode of modulator 310 is frequency, amplitude and the phase places that change second oscillator signal, the signal Sc behind the modulation can with
Expression, wherein
Then signal Sc can be expressed as follows:
Receiving circuit 130 is received RF signal RF3 and signal Sc simultaneously:
signal_in＝A
2cos(w
ct+φ)-Bcos(w
ct+φ)
＝(A
2-B)cos(w
ct+φ)
Can find by following formula, can suppress the amplitude of radiofrequency signal RF3, leak to the energy of antenna 110 by antenna 120 to cut down directly by the amplitude B of modulating signal Sc suitably.One of main purpose of modulator 310 is the phase place that is used for changing oscillator signal, its implementation method has many kinds, and mode generally speaking commonly used is to utilize the resistance series capacitance or utilize the inductance series capacitance that signal is produced to postpone to reach the purpose of change phase place.
In sum, by the signal that signal receives and the transmitting terminal of radiating circuit is launched, sometimes can expectedly not be received end receives, when the energy that transmits during much larger than the default energy range of receiving of receiving terminal, therefore receiving terminal is understood and the state that reaches capacity, cause receiving the less signal of energy of expection, this kind situation is common in the read-write equipment of identification technique in wireless radio frequency again.The present invention proposes a kind of solution and corresponding circuit, in signal reception and radiating circuit, add one group of modulating signal device, this modulating signal device is coupled to the receiving terminal of signal reception and radiating circuit, be used for producing a modulating signal, and this modulating signal directly transferred to this receiving terminal in the mode of wire transmission, offset by transmitting terminal and leak signal to receiving terminal, saturated to prevent receiving terminal.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. the read-write equipment of a radio frequency identification sign is characterized in that, includes:
One receiving circuit, it receives one first signal and a secondary signal;
One oscillator is used for producing an oscillator signal;
One first modulator is coupled to this oscillator, be used for this oscillator signal of modulation with produce this first signal and not this oscillator signal of modulation to produce a radiofrequency signal that does not contain instruction;
One power amplifier is coupled to this first modulator, is used for amplifying this first signal and this radiofrequency signal; And one second modulator, be coupled to this oscillator and this receiving circuit, be used for this oscillator signal of modulation to produce this secondary signal, and this secondary signal and this radiofrequency signal have a phase difference, so that this radiofrequency signal and this secondary signal produce the effect that weakens mutually in this receiving circuit.
2. read-write equipment according to claim 1 is characterized in that, this receiving circuit receives this first signal and this radiofrequency signal in the mode of wireless receiving, and receives this secondary signal in the mode of wired reception.
3. read-write equipment according to claim 1 is characterized in that, this secondary signal is identical with this radio frequency signal frequency, and this phase difference is 180 degree.
4. read-write equipment according to claim 1 is characterized in that, the phase place that this second modulator postpones this oscillator signal is producing this secondary signal, and this phase difference is 180 degree.
5. read-write equipment according to claim 1 is characterized in that, the amplitude of this this oscillator signal of second modulator modulation is so that the amplitude of this radiofrequency signal of amplitude convergence of this secondary signal.
6. read-write equipment according to claim 1 is characterized in that, this second modulator comprises one by resistor and phase-delay network that capacitors in series constituted.
7. according to claim 1 a described read-write equipment, it is characterized in that this second modulator comprises one by inductor and phase-delay network that capacitors in series constituted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100832925A CN101083479B (en) | 2006-05-31 | 2006-05-31 | Signal receiving and transmitting device and method for preventing saturation of receiving end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100832925A CN101083479B (en) | 2006-05-31 | 2006-05-31 | Signal receiving and transmitting device and method for preventing saturation of receiving end |
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| Publication Number | Publication Date |
|---|---|
| CN101083479A CN101083479A (en) | 2007-12-05 |
| CN101083479B true CN101083479B (en) | 2011-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100832925A Active CN101083479B (en) | 2006-05-31 | 2006-05-31 | Signal receiving and transmitting device and method for preventing saturation of receiving end |
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|---|---|
| CN (1) | CN101083479B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0905914A2 (en) * | 1997-08-27 | 1999-03-31 | Shin-A Telecom | Apparatus for cancelling radio frequency interference between transmitting antenna and receiving antenna, repeating system and transmitting and receiving system using the same |
| CN1553867A (en) * | 2001-10-31 | 2004-12-08 | ��������ķ������ | Tire pressure monitoring system |
| WO2005034377A1 (en) * | 2003-09-30 | 2005-04-14 | Intel Corporation | Broadband interference cancellation |
-
2006
- 2006-05-31 CN CN2006100832925A patent/CN101083479B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0905914A2 (en) * | 1997-08-27 | 1999-03-31 | Shin-A Telecom | Apparatus for cancelling radio frequency interference between transmitting antenna and receiving antenna, repeating system and transmitting and receiving system using the same |
| CN1553867A (en) * | 2001-10-31 | 2004-12-08 | ��������ķ������ | Tire pressure monitoring system |
| WO2005034377A1 (en) * | 2003-09-30 | 2005-04-14 | Intel Corporation | Broadband interference cancellation |
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| Publication number | Publication date |
|---|---|
| CN101083479A (en) | 2007-12-05 |
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Effective date of registration: 20200409 Address after: No.1, Duhang 1st Road, Hsinchu City, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: Hsinchu County, Taiwan, China Patentee before: MStar Semiconductor, Inc. |