CN201066839Y - Anti-interference communication circuit between module circuits and mobile phone with this circuit - Google Patents
Anti-interference communication circuit between module circuits and mobile phone with this circuit Download PDFInfo
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- CN201066839Y CN201066839Y CNU2007200241944U CN200720024194U CN201066839Y CN 201066839 Y CN201066839 Y CN 201066839Y CN U2007200241944 U CNU2007200241944 U CN U2007200241944U CN 200720024194 U CN200720024194 U CN 200720024194U CN 201066839 Y CN201066839 Y CN 201066839Y
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- transmssion line
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Abstract
The utility model discloses an anti-interference communication circuit between module circuits and a mobile phone with the circuit, which comprises a plurality of module circuits. The module circuits are connected by a signal transmission line which transmits high and low level signals. The signal transmission line is connected with a pull-up resistor and a DC power by the pull-up resistor. Therefore, the anti-interference problem of the communication circuit is solved successfully. When the utility model is concretely applied to a mobile phone circuit, that is to connect the pull-up resistor which is connected with the DC power to an SPI serial bus, on which a radio frequency circuit and a base-band circuit are connected, the communication interference problem between the base-band circuit and the radio frequency circuit is effectively solved; the time sequence and the voltage stability are ensured; the impact of base-band interfering signals on the radio frequency circuit is avoided. The anti-interference circuit of the utility model has the advantages of simple structure and low cost and can be widely applied to various communication circuit designs of high and low level signal transmission.
Description
Technical field
The utility model belongs to the mobile communication technology field, specifically, relates to the antijam communication circuit between a kind of modular circuit.
Background technology
Traditional GSM cellular handset is a transceiver that is operated under the duplex state.A mobile phone comprises radio frequency part and baseband portion, and wherein, radio frequency part comprises receiving unit and radiating portion, and baseband portion comprises parts such as Digital Logic, power management and demonstration.The GSM radio system is received by radio frequency and radio-frequency transmissions two parts are formed, and radio-frequency (RF) receiving circuit is finished functions such as the reception, amplification, demodulation of received signal; The radio-frequency transmissions circuit is mainly finished functions such as the modulation, carrier frequency, power control of baseband signal.
The design of the control timing of radio circuit is even more important, and comprises that serial ports is write with serial ports to read sequential etc.As a complete gsm system, baseband portion has different control signals, data-signal to be connected with radio frequency part.Therefore, can exert an influence to radio circuit, cause the sequential mistake from the interference signal of base band, radio circuit part operation irregularity, radio-frequency (RF) index is had a strong impact on.
Based on this, how utilizing simple circuit configuration to design a kind of antijam communication circuit is subject matter to be solved in the utility model.
The utility model content
The utility model is subject to the interference signal influence in order to solve the existing communication circuit, causes system works unusual problem to occur, a kind of novel telecommunication circuit structure is provided, effectively suppressed the adverse effect of interference signal, guaranteed the transmission accurately and reliably of signal between the modular circuit telecommunication circuit.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
Antijam communication circuit between a kind of modular circuit comprises a plurality of modular circuits, and described modular circuit is connected by signal transmssion line, and described signal transmssion line transmits high/low level signal; Wherein, on described signal transmssion line, be connected with pull-up resistor, and connect DC power supply by described pull-up resistor.
In order to ensure the accuracy of each road signal transmission, in described signal transmssion line, each root holding wire is separately by drawing resistance to connect DC power supply on the way.
Further, the current potential of described DC power supply equates with the current potential of the high level signal that transmits by described signal transmssion line.
Again further, described signal transmssion line is a universal serial bus, specifically can select the SPI universal serial bus, and its high level current potential is generally 2.8V, and therefore, it is the DC power supply connection realization of 2.8V that described DC power supply is correspondingly selected current potential.Certainly, described universal serial bus also can be I
2Bus forms such as C.
In conjunction with above-mentioned antijam communication circuit, the utility model has proposed a kind of cell phone of this circuit of application again, the internal circuit board of described mobile phone is provided with a plurality of modular circuits, such as radio circuit that is connected by the SPI universal serial bus and baseband circuit, for the interference signal that overcomes from base band exerts an influence to radio circuit, thereby the problem that causes the sequential mistake, on being connected with on the described SPI universal serial bus, draw branch road by pull-up resistor connection DC power supply, high level current potential by the universal serial bus transmission is stabilized on the DC power supply current potential, make its influence of signal that can not be interfered, thereby effectively guaranteed the accuracy and the reliability of signal transmission.
Compared with prior art, advantage of the present utility model with good effect is: telecommunication circuit of the present utility model is by drawing branch road being connected on the signal transmssion line on the current potential of forming that is connected with DC power supply by pull-up resistor, solved the anti-interference problem of telecommunication circuit well, specifically be applied in the cell phone circuit, promptly on the SPI universal serial bus that radio circuit is connected with baseband circuit, be connected the pull-up resistor that links to each other with DC power supply, thereby efficiently solve the interference problem of communication between base band and the radio circuit, guaranteed the stable of sequential and voltage, the influence of having avoided baseband interference signal that radio circuit is produced.Anti-jamming circuit structure of the present utility model is simple, and cost is lower, can be widely used in the telecommunication circuit design of various transmission high-low level signals.
Description of drawings
Fig. 1 is the telecommunication circuit schematic diagram between RF transceiver module and the baseband circuit in the existing mobile phone circuit;
Fig. 2 is the antijam communication circuit theory diagrams that the utility model proposes;
Fig. 3 is based on the circuit theory diagrams of a kind of specific embodiment that Fig. 2 design concept proposed.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
In existing cell phone circuit, radio system generally all is made up of radio-frequency (RF) receiving circuit and radio-frequency transmissions circuit two parts, the major function that it is finished is: the baseband signal of mobile phone up channel is passed through the radiating circuit modulating transformation, launch from antenna end with 880 to 915MHz/1710 to 1785MHz; The wireless signal of the base station of the 925 to 960MHz/1805 to 1880MHz that antenna end is received obtains the down channel baseband signal by the demodulation process of receiving circuit; Provide stable controlled 26.0MHz frequency source for mobile phone simultaneously.
Wherein, in the radio-frequency transmissions circuit, transmitter unit mainly is made up of following circuit: RF transceiver, power amplifier, front-end module and control circuit.Its signal flow is: the i/q signal that baseband circuit sends after power amplifier amplifies, outputs to antenna by the front-end module switch again, and then is launched by antenna after the modulation of RF transceiver, upconverting to corresponding frequencies.And in radio-frequency (RF) receiving circuit, receiving element mainly is made up of following circuit: RF transceiver and front-end module FEM, SAW filter and output matching circuit.Its signal flow is: GSM, DCS or PCS signal that antenna sends from aerial reception base station, be transformed into differential signal by the filter segment in the front-end module, be input in the RF transceiver, in the RF transceiver, finish low noise amplification, orthogonal transform, amplification and the Filtering Processing of front end; Export i/q signal at last in baseband circuit.
Fig. 1 shows a kind of schematic diagram of existing RF transceiver module circuit, general SPI (the SerialPeripheral Interface--Serial Peripheral Interface (SPI)) bus that adopts is connected communication with baseband circuit, comprise serial time clock line (SCLK), serial data line (SDIO) and the effective slave selection wire of low level (/SEN), only when slave allowed, serial clock SCLK pulse just was moved into slave to the serial data SDIO in the main frame; When forbidding, serial clock SCLK is to not influence of slave.In the process of the actual use of mobile phone, the interference effect that this three signal line is come from the outside sometimes or mobile phone self circuit produces, at this moment, SCLK ,/SEN, SDIO signal may not reach 2.8V owing to the effect of interference signal in high level, thereby cause RF transceiver cisco unity malfunction, radio frequency part goes wrong, and such as the generation of situations such as lost network, thereby has had a strong impact on the complete machine quality of communication apparatus.
In order to address the above problem, the utility model proposes a kind of antijam communication circuit solution, can extensively be useful on the signal transmssion line of the high/low level signal of transmission, promptly the signal that is transmitted only comprises high level and two kinds of potential states of low level.In order to reach jamproof purpose, carry out at needs having designed anti-jamming circuit as described in Figure 2 on the signal transmssion line between the modular circuit of signal communication, specifically adopt the form that on holding wire, connects pull-up resistor to realize.Among Fig. 2, the communication interface D0 of modular circuit 1～D7 is by the communication interface D0～D7 corresponding connection of signal transmssion line with modular circuit 2, to realize the real-time Transmission of signal each other.In transmission course, be subject to the problem disturbed in order to solve signal, be connected with the pull-up resistor R10～R1 7 that moves DC power supply VCC on the described signal transmssion line, the potential value of the high level signal that the potential value of described DC power supply VCC should equal in the signal transmssion line to be transmitted.Like this, when signal transmssion line transmission high level signal, DC power supply VCC is stabilized in high level signal on the potential value of DC power supply VCC, promptly on the normal electrical place value of high level signal, to avoid interference effect of signals, make its generation differ from the voltage of high level potential value; And when the transmission low level signal, the communication interface of sending module (modular circuit 1 or modular circuit 2) drags down the current potential of holding wire, DC power supply VCC is inoperative to it, thereby can guarantee effectively that receiver module (modular circuit 2 or modular circuit 1) accurately receives low level signal.Thus, just solved interference problem, guaranteed that the voltage of transmission signals is stable, effectively guaranteed the stability and the reliability of communicating by letter between the modular circuit by simple circuit configuration.
The frequent degree difference that described pull-up resistor R10～R17 can be disturbed according to signal transmssion line optionally is connected on the signal transmssion line that is subject to interference effect, to save circuit cost, simplifies circuit structure; Also or on each bars transmission line, all connect the pull-up resistor branch road of moving DC power supply VCC on the way to, to realize anti-interference process to each road transmission signals, adopt this design, though on circuit structure slightly complicated, but, can effectively improve the antijamming capability of system.
Certainly, described signal transmssion line both can be a parallel bus, also can be universal serial bus, such as SPI universal serial bus or I
2C universal serial bus or the like.
Embodiment one, and present embodiment is the Anti-Jamming Technique that example is specifically set forth signal transmission between baseband circuit and the radio circuit with the gsm module mobile phone specifically, referring to shown in Figure 3.
Among Fig. 3, the RF transceiver module IC0802 in the radio circuit can adopt the AeroII chip Si4210GM transceiver of Silicon Laboratory company to realize that it is a complete RF transceiver module, is applicable to multiband GSM and GPRS radio communication.Radiating portion connects baseband processor and power amplifier, and receiving unit connects RF band and selects SAW filter and baseband processor.Baseband processor comes Si4210GM transceiver ic 0802 is implemented control by spi bus.
The spi bus system is a kind of synchronous serial Peripheral Interface, and it can make MCU and various ancillary equipment communicate with serial mode, with exchange message.Among Fig. 3, the SPI interface SCLK of RF transceiver ic 0802 ,/SEN, SDIO separately the respective pin SCLK by one road current-limiting resistance R0812, R0811, R0810 and the SPI interface of baseband processor IC0801 ,/the corresponding connection of SEN, SDI0, transmission respectively: serial clock signal, should export 2.8V during high level; Slave is selected control signal, and low level is effective; Serial data signal should be exported 2.8V during high level.Meanwhile, the parasitic capacitance of described current-limiting resistance R0812, R0811, R0810 and RF transceiver ic 0802 chip pin constitutes the RC filter network, and effective filtering high-frequency signal is with the interference of inhibition to radiofrequency signal.
In the mobile phone circuit system; interference signal regular meeting from baseband circuit exerts an influence to RF transceiver ic 0802; when this three signal line of spi bus is interfered; may not reach 2.8V owing to the effect of interference signal during its transmission high level signal; thereby cause transceiver ic 0802 cisco unity malfunction, radio circuit work occurs unusual.For fear of the influence of interference signal to spi bus, in the present embodiment, three signal line in the spi bus respectively by drawing resistance R 0818, R0815, R0814 to connect DC power supply VRF on the way, are moved to the high level signal that transmits in the holding wire on the current potential of DC power supply VRF on by force by drawing branch road on described.VRF is the power supply that is used for radio frequency part that is produced by the cellular phone power supplies managing chip, and in order to guarantee the accuracy of high level signal transmission, its potential value should be 2.8V.The resistance of described pull-up resistor R0818, R0815, R0814 can be chosen as 10K Ω.After having adopted so simple method, the high level signal that transmits by spi bus just can be stabilized in 2.8V, and the influence of the signal that can not be interfered produces the voltage that differs from 2.8V.When baseband processor IC0801 sends low level signal, voltage in the holding wire becomes low level by high level, and at this moment, the pull-up resistor branch road is inoperative, thereby effectively guaranteed the stable of sequential and voltage, solved the interference problem of communicating by letter between base band and the radio circuit.
The Anti-Jamming Technique that the utility model proposed equally also can be applied in I except using on the spi bus in the present embodiment
2On the SCL of C bus and the SDA holding wire, the resistance of its pull-up resistor is typically chosen in 1K Ω to 10K Ω, and the DC power supply potential value that connects pull-up resistor is according to I
2C bus actual conditions can be chosen as 3.3V or 5V, can reach the purpose of stabilized communication equally.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1. the antijam communication circuit between the modular circuit comprises a plurality of modular circuits, and described modular circuit is connected by signal transmssion line, and described signal transmssion line transmits high/low level signal; It is characterized in that: on described signal transmssion line, be connected with pull-up resistor, and connect DC power supply by described pull-up resistor.
2. antijam communication circuit according to claim 1 is characterized in that: in described signal transmssion line, each root holding wire is separately by drawing resistance to connect DC power supply on the way.
3. antijam communication circuit according to claim 1 and 2 is characterized in that: the current potential of described DC power supply equates with the current potential of the high level signal that transmits by described signal transmssion line.
4. antijam communication circuit according to claim 3 is characterized in that: described signal transmssion line is a universal serial bus.
5. antijam communication circuit according to claim 4 is characterized in that: described universal serial bus is a spi bus; The current potential of described DC power supply is 2.8V.
6. mobile phone with antijam communication circuit, described mobile phone internal circuit board is provided with a plurality of modular circuits, and described modular circuit is connected by signal transmssion line, and described signal transmssion line transmits high/low level signal; It is characterized in that: on described signal transmssion line, be connected with pull-up resistor, and connect DC power supply by described pull-up resistor.
7. mobile phone according to claim 6 is characterized in that: described modular circuit is radio circuit and baseband circuit, and the described signal transmssion line that is connected therebetween is a universal serial bus.
8. according to claim 6 or 7 described mobile phones, it is characterized in that: in described universal serial bus, each root holding wire is separately by drawing resistance to connect DC power supply on the way.
9. mobile phone according to claim 8 is characterized in that: the current potential of described DC power supply equates with the current potential of the high level signal that transmits by described universal serial bus.
10. mobile phone according to claim 9 is characterized in that: described universal serial bus is a spi bus; The current potential of described DC power supply is 2.8V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200241944U CN201066839Y (en) | 2007-06-26 | 2007-06-26 | Anti-interference communication circuit between module circuits and mobile phone with this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200241944U CN201066839Y (en) | 2007-06-26 | 2007-06-26 | Anti-interference communication circuit between module circuits and mobile phone with this circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201066839Y true CN201066839Y (en) | 2008-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200241944U Expired - Fee Related CN201066839Y (en) | 2007-06-26 | 2007-06-26 | Anti-interference communication circuit between module circuits and mobile phone with this circuit |
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| CN (1) | CN201066839Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609348A (en) * | 2008-06-16 | 2009-12-23 | 鸿富锦精密工业（深圳）有限公司 | Time sequence adjusting circuit |
| CN103762997A (en) * | 2014-02-21 | 2014-04-30 | 联想(北京)有限公司 | Anti-jamming circuit and radio frequency processing circuit |
-
2007
- 2007-06-26 CN CNU2007200241944U patent/CN201066839Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609348A (en) * | 2008-06-16 | 2009-12-23 | 鸿富锦精密工业（深圳）有限公司 | Time sequence adjusting circuit |
| CN101609348B (en) * | 2008-06-16 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Time sequence adjusting circuit |
| CN103762997A (en) * | 2014-02-21 | 2014-04-30 | 联想(北京)有限公司 | Anti-jamming circuit and radio frequency processing circuit |
| CN103762997B (en) * | 2014-02-21 | 2015-12-09 | 联想(北京)有限公司 | Anti-jamming circuit and rf processing circuitry |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080528 Termination date: 20110626 |