CN103178483A - Radio frequency signal source with reverse protection function and reverse protection method - Google Patents
Radio frequency signal source with reverse protection function and reverse protection method Download PDFInfo
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- CN103178483A CN103178483A CN2011104312649A CN201110431264A CN103178483A CN 103178483 A CN103178483 A CN 103178483A CN 2011104312649 A CN2011104312649 A CN 2011104312649A CN 201110431264 A CN201110431264 A CN 201110431264A CN 103178483 A CN103178483 A CN 103178483A
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Abstract
The invention is mainly applied to the field of radio frequency communication and particularly relates to a reverse protection device and a reverse protection method. The reverse protection method includes that a radio frequency signal generation circuit generates radio frequency signals, and transmits the signals to an output terminal through a transmission line. The output terminal transmits the radio frequency signals to the outer portion of a radio frequency signal source. A power distributor extracts one part of signal power from reverse input signals on the transmission line and transmits the part of signal power to a detection unit and an amplifying unit, and the signal power finally enters a comparison unit. The amplified direct current voltage signals and preset threshold voltage are compared. If amplified direct current voltage signals exceed the threshold voltage, signals for disconnecting the transmission line are transmitted to a switch unit connected in series with the transmission line, and signals for connecting the transmission line are output to the switch unit if the amplified direct current voltage signals do not exceed the threshold voltage. By means of the reverse protection device and the reverse protection method, effect of the existing overcurrent protection device on radio frequency signal output can be reduced, and the reverse protection device is suitable for high frequency radio frequency output devices and has high response speed.
Description
Technical field
The present invention is mainly used in radio-frequency measurement field, especially a kind of radio-frequency signal source and reverse protection method with reverse protection function.
Background technology
Transmitter is to provide needed signal, and equipment itself does not carry out signal analysis, as radio-frequency signal source etc.; Receiving equipment refers to itself does not have signal output, and the signal of sending into by receiving the external world is made various analyses, and as spectrum analyzer, oscilloscope etc. are receiving equipment.
May have the signal of reverse input at its output for transmitter, the output connection error of transmitter for example, and if at this moment oppositely the signal power of input cross the circuit elements device that conference damages transmitter.
Be illustrated in figure 1 as the structure chart of signal source overcurrent protective device in prior art; application number is that its basic principle of patented technology of 200710088221.9 is: this protective circuit comprises over-current overvoltage protector 101; voltage clamp unit 102; overcurrent onunit 103; operational amplifier 104; the first protective resistance 105 and the second protective resistance 106; operational amplifier void is short by utilizing, empty disconnected principle; make when normal operation; the voltage at the over-current overvoltage protector two ends in circuit keeps equating, thereby reaches the purpose of eliminating over-current overvoltage protector internal resistance impact.Yet, along with the continuous lifting of signal source output frequency, even simple resistance also can cause tremendous influence to the performance of radiofrequency signal.
The parts such as another kind of available technology adopting digital signal processing chip (DSP) or CPU detect; but; because processor need to carry out interrupt response; cause each detection need to wait for the operating lag of machine system; therefore can't adapt to operating frequency reaches several GHzs; or even the detection of the reverse input signal of the radio-frequency transmissions equipment of tens GHzs, protect so can not increase this protection module at the output of radiofrequency signal.
Therefore, need a kind of response rapidly signal source oppositely to be inputted the device of protecting.
Summary of the invention
The object of the invention is to solve in prior art that the reverse input signal of signal source is excessive causes the internal component damage, a kind of radio-frequency signal source and reverse protection method with reverse protection function is provided.
The embodiment of the present invention provides a kind of radio-frequency signal source with reverse protection function, comprises that a radiofrequency signal produces circuit, a transmission line, a lead-out terminal, described radiofrequency signal produces circuit and produces radiofrequency signal, and by transmission line to lead-out terminal, it is outside that lead-out terminal sends to described radio-frequency signal source with described radiofrequency signal, it is characterized in that, also comprise, power divider, detection unit, amplifying unit, comparing unit, switch element;
Described power divider extracts a part of signal power in the reverse input signal on described transmission line, and sends described a part of signal power to detection unit;
Described detection unit is converted to d. c. voltage signal with the signal power that receives;
Described amplifying unit amplifies described d. c. voltage signal;
Described comparing unit, the d. c. voltage signal of described amplification is compared with predetermined threshold voltage, if the d. c. voltage signal of described amplification surpasses described threshold voltage, disconnect to the switch element output that is series on described transmission line the cut-off signal that connects between described radiofrequency signal generation circuit and lead-out terminal, otherwise produce to the described radiofrequency signal of described switch element output conducting the Continuity signal that connects between circuit and lead-out terminal.
An a kind of further aspect with radio-frequency signal source of reverse protection function described according to the embodiment of the present invention, the power distributing circuit of described power divider for being consisted of by divider resistance, the perhaps power distributing circuit for being consisted of by directional coupler.
A kind of another further aspect with radio-frequency signal source of reverse protection function described according to the embodiment of the present invention, described detection unit comprises diode detector, triode detector or amplifier wave detector.
A kind of another further aspect with radio-frequency signal source of reverse protection function described according to the embodiment of the present invention also comprises the DAC transducer, is connected with described comparing unit, and the threshold voltage of described comparing unit is set by described DAC transducer.
a kind of another further aspect with radio-frequency signal source of reverse protection function described according to the embodiment of the present invention, described switch element comprises relay, wherein said relay one end is connected in lead-out terminal, the other end produces between circuit and earth resistance in radiofrequency signal and switches, the connection that disconnects between described radiofrequency signal generation circuit and lead-out terminal refers to, described relay is connected described lead-out terminal with described earth resistance, the connection that the described radiofrequency signal of conducting produces between circuit and lead-out terminal refers to, described relay produces circuit with described lead-out terminal and described radiofrequency signal and is connected.
The embodiment of the present invention also provides a kind of reverse protection method of radio-frequency signal source, it is characterized in that comprising,
Extract a part of signal power in the reverse input signal on the transmission line that described signal source transmits radiofrequency signal;
A part of signal power of described reverse input signal is converted to d. c. voltage signal;
Described d. c. voltage signal is amplified;
The d. c. voltage signal of described amplification is compared with predetermined threshold voltage, if the d. c. voltage signal of described amplification surpasses described threshold voltage, control the connection between the described radiofrequency signal generation circuit of the switch element disconnection that is series in described transmission line and lead-out terminal, otherwise control the connection between the described radiofrequency signal generation circuit of described switch element conducting and lead-out terminal.
A further aspect according to the reverse protection method of the described a kind of radio-frequency signal source of the embodiment of the present invention; a part of signal power in reverse input signal on the described transmission line of described extraction comprises; with the d. c. voltage signal of described amplification with also comprise during predetermined threshold voltage is compared; regulate described threshold voltage, thereby control comparative result.
Can compare by the above-mentioned components and parts in the embodiment of the present invention uses the reaction speed of the process chip such as DSP faster; be fit to the equipment such as high-frequency signal source, spectrum analyzer; and can reduce existing overcurrent protective device to the impact of radiofrequency signal output; and suitable high-frequency radio frequency output equipment has very fast response speed, avoids the radio frequency output equipment to cause the damage of device due to powerful reverse input signal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Figure 1 shows that the structure chart of signal source overcurrent protective device in prior art;
Figure 2 shows that the structural representation of the reverse protection device of a kind of signal source of the embodiment of the present invention;
Figure 3 shows that the flow chart of the reverse protection method of a kind of signal source of the embodiment of the present invention;
Fig. 4 is described is the concrete structure schematic diagram of the reverse protection device of a kind of signal source of the embodiment of the present invention;
Fig. 5 a is depicted as embodiment of the present invention resistive power splitter circuit diagram;
Fig. 5 b is depicted as embodiment of the present invention directional coupler and realizes power divider circuits figure;
Figure 6 shows that embodiment of the present invention amplification circuit diagram;
Figure 7 shows that embodiment of the present invention operational amplification circuit figure;
Figure 8 shows that the embodiment of the present invention has the structural representation of the radio-frequency signal source of reverse protection function at another.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Be illustrated in figure 2 as a kind of structural representation with radio-frequency signal source of reverse protection function of the embodiment of the present invention.
This reverse protection application of installation is in radio-frequency signal source; comprise that a radiofrequency signal produces circuit; a transmission line; a lead-out terminal; described radiofrequency signal produces circuit and produces radiofrequency signal; and by transmission line to lead-out terminal, it is outside that lead-out terminal sends to described radio-frequency signal source with described radiofrequency signal, wherein said radiofrequency signal produces circuit and does not draw in Fig. 2.Have radiofrequency signal in the radio-frequency signal source of reverse protection function produce between circuit, reverse protection device, transmission line, lead-out terminal relation as shown in Figure 8; its specific works principle is: produce a wideband frequency signal (f1-f2) by signal oscillator by vibration; carry out frequency expansion by times frequency module and frequency division module, make its frequency range be
(wherein N is the frequency division number of times; M is the frequency multiplication number of times); signal after frequency expansion is controlled and modulation by the ALC module amplitude of carrying out; control its final output amplitude by attenuation module at last; can judge from lead-out terminal by reverse protection module (reverse protection device as described in top embodiment) whether powerful reverse signal input is arranged; if have the output channel in cut-off signal source can protect the electric elements of emission of radio frequency signals device interior impaired like this.
Wherein power divider 201, extract a part of signal power in the reverse input signal on described transmission line, and send described a part of signal power to detection unit 202.If the power of described reverse input signal will cause the damage of ﹠ RF Components in signal source, oppositely the signal power of input will be much larger than the radiofrequency signal power of signal source output, therefore, the radio frequency output signal that comprises of the reverse input signal of the part of extraction can be ignored.
Amplifying unit 203 amplifies described d. c. voltage signal.
Comparing unit 204, the d. c. voltage signal of described amplification is compared with predetermined threshold voltage, if the d. c. voltage signal of described amplification surpasses described threshold voltage, disconnect to switch element 205 outputs that are series in described transmission line the cut-off signal that connects between described radiofrequency signal generation circuit and lead-out terminal, otherwise produce to the described switch element 205 described radiofrequency signals of output conducting the Continuity signal that connects between circuit and lead-out terminal.
Wherein, the power distributing circuit that described power divider 201 can be made of divider resistance; it can be also the power distributing circuit that is consisted of by directional coupler; power distributing circuit due to what adopt; power divider 201 just extracts the oppositely power of input signal of a part from transmission line; and the radio frequency output signal that in transmission line, these are extracted can be by calibrating to eliminate, and therefore described reverse protection device is on the radiofrequency signal impact of signal source radio frequency output and little.Described detection unit 202 can adopt diode detector, the means such as triode detector or amplifier wave detector realize, perhaps can also adopt with the integrated chip of detection function and realize, the integrated chip that for example has the detection function, it may be by some chip suppliers by doing a plurality of diodes or a plurality of triode integrated and coupling is made a chip module that possesses this function, can well guarantee the properties of detection, as impedance matching, output voltage range is controlled, and noise factor is controlled etc.
The threshold voltage of described comparing unit 204 can flexible configuration, for example utilize the DAC transducer to realize comparing the digital controlled signal of unit 204 input control threshold voltages, thereby control the comparative result of described comparing unit 204, and then the switch of control switch unit 205, realize the control that is connected to output with the inner electric elements of signal source.
By above-described embodiment, can reduce existing overcurrent protective device to the impact of radiofrequency signal output, and suitable high-frequency radio frequency output equipment has very fast response speed, avoid the radio frequency output equipment to cause the damage of device due to powerful reverse input signal.
Be illustrated in figure 3 as the flow chart of the reverse protection method of a kind of radio-frequency signal source of the embodiment of the present invention.
The method is applied to radio-frequency signal source, comprises step 301, extracts a part of signal power in the reverse input signal on the transmission line that described signal source transmits radiofrequency signal.
Step 302 is converted to d. c. voltage signal with a part of signal power of described reverse input signal.
Step 303 is amplified described d. c. voltage signal.
Step 304 is compared the d. c. voltage signal of described amplification with predetermined threshold voltage, if the d. c. voltage signal of described amplification surpasses described threshold voltage, enter step 305, otherwise enter step 306.
Step 305 is controlled the connection between the described radiofrequency signal generation circuit of the switch element disconnection that is series in transmission line and lead-out terminal.
Step 306 is controlled the connection between the described radiofrequency signal generation circuit of described switch element conducting and lead-out terminal.
In described step 301, can adopt the power division mode of divider resistance, also can adopt the power division mode of directional coupler to extract reverse input signal on described transmission line.
In described step 304, also comprise and regulate described threshold voltage, thereby control the comparative result of described step 304, and then the switch of control switch unit, realize the control that is connected to output with the inner electric elements of signal source.
By above-described embodiment, can reduce existing overcurrent protective device to the impact of radiofrequency signal output, and suitable high-frequency radio frequency output equipment has very fast response speed, avoid the radio frequency output equipment to cause the damage of device due to powerful reverse input signal.
Be the concrete structure schematic diagram of the reverse protection device of a kind of signal source of the embodiment of the present invention as described in Figure 4.
Wherein, described relay switch 407 is series in transmission line 401, produces between circuit 402 and lead-out terminal 408 in radiofrequency signal, namely before oppositely input signal enters into described signal source internal circuit components and parts 402.
Wherein, described radiofrequency signal produces circuit 402 and produces radiofrequency signal, and is transferred to lead-out terminal 408 by transmission line 401, and it is outside that lead-out terminal 408 sends to described radio-frequency signal source with described radiofrequency signal.
if the connection (namely disconnecting transmission line 401) between the described radiofrequency signal generation circuit 402 of the control signal disconnection that receives comparing unit 406 and lead-out terminal 408, the signal power of the reverse input of explanation is excessive, may cause system failure, described relay switch 407 will switch to R1 (high-power resistance R1 ground connection) this moment, signal link is disconnected, make the signal of reverse input can not enter into relay signal source internal circuit components and parts 402 before, if comparing unit 406 is the control command of conducting to relay switch 407 outputs, even explanation has reverse input signal also can not cause the damage of signal source internal circuit components and parts 402, this moment, relay switch 407 will be connected with C1 (powerful capacitance C1), this signal source can be exported radiofrequency signal.Described relay 407 1 ends are connected in lead-out terminal 408, the other end produces between circuit 402 and earth resistance R1 in radiofrequency signal and switches, the connection that disconnects between described radiofrequency signal generation circuit 402 and lead-out terminal 408 refers to, described relay 407 is connected described lead-out terminal 408 with described earth resistance R1, the connection that the described radiofrequency signal of conducting produces between circuit 402 and lead-out terminal 408 refers to, described relay 407 is connected described lead-out terminal 408 with described radiofrequency signal generation circuit 402.
the radiofrequency signal that described power divider 403 is producing radio frequency signal generating circuit 402 does not cause too large impact, extracting sub-fraction radiofrequency signal P3 power in radiofrequency signal P1 from transmission line deals with, also has remaining radiofrequency signal P2 in the transmission line of signal source, be far longer than the radio frequency output signal in the situation that have the reverse input signal of reverse input signal, therefore the sub-fraction signal that extracts can be seen the signal power of reverse input signal as, can be depicted as with resistance power divider circuits figure as Fig. 5 a, the extraction of signal power is by resistance R 1, the size of the ratio between R2 and RL determines, the signal power of the reverse input signal of power divider 403 extractions in this example is about P* (RL/R1+R2) (wherein, P is the gross power of reverse input power).Perhaps can also adopt directional coupler as shown in Fig. 5 b to realize the function of power divider, wherein, port one and port 2 are the transmission line of radio frequency output signal, port 3 is for extracting the oppositely port of input signal of a part, port 4 is connected with earth resistance RL, and wherein θ represents the electrical length of microstrip line.
The input signal that is sent to that detection unit 404 will extract is converted to d. c. voltage signal.Described detection unit can have a variety of, diode detection for example, triode detection and amplifier detection etc., can also adopt the integrated chip with above-mentioned functions, utilize this integrated chip to carry out detection, can well guarantee the properties of detection, as impedance matching, output voltage range is controlled, and noise factor is controlled etc.
amplifying unit 405 amplifies the d. c. voltage signal of detection unit 404 conversions, because the signal power that power divider 403 extracts is less, therefore the d. c. voltage signal of conversion is also very little, be unfavorable for the comparison of follow-up comparing unit 406, therefore through amplifying unit 405, d. c. voltage signal is amplified, can adopt amplifying circuit for example shown in Figure 6 to amplify, wherein, Vi is the direct voltage through conversion of input, Vo is output voltage, pass between the two is: Vo=Vi (1+R6/R4), input and output ratio adjustment period of can be according to the side circuit demand, thereby control the output area of its output voltage.
comparing unit 406, the d. c. voltage signal of described amplification is compared with predetermined threshold voltage, if the d. c. voltage signal of described amplification surpasses described threshold voltage, disconnect to relay switch 407 outputs that are series in described transmission line the signal that described radiofrequency signal produces connection between circuit 402 and lead-out terminal 408, otherwise produce to the described relay switch 407 described radiofrequency signals of output conducting the signal that connects between circuit 402 and lead-out terminal 408, can adopt operational amplification circuit for example shown in Figure 7 to realize, wherein, Vj amplifies voltage afterwards by detection, Vref is threshold voltage, Vcal is both control relay switch 407 conductings of output relatively afterwards or the control voltage of shutoff, Vcc is the supply power voltage of operational amplifier.
If: Vj＞Vref, Vcal=Vcc;
Vj＜Vref, Vcal=0V.
Here Vcal has just produced two states, can come respectively the two states of control relay switch 407.Certainly, if also have other control signals to participate in the control of relay, some logical circuits of increase that can be suitable realize, as NAND gate, not gate etc. do not repeat them here.Because Vref is come by the Vcc dividing potential drop; so the adjusting resistance value is adjusted the value of Vref according to actual needs; thereby select the power level that oneself needs protection; can have some auxiliary circuits the function that Vref is set is provided to the user; the Vref value is set adopts digital analog converter (DAC transducer) to produce a variable threshold voltage, thereby can use this unit protection different capacity scope.
Can compare by the above-mentioned components and parts in the embodiment of the present invention uses the reaction speed of the process chip such as DSP faster; be fit to the equipment such as high-frequency signal source, spectrum analyzer; and can reduce existing overcurrent protective device to the impact of radiofrequency signal output; and suitable high-frequency radio frequency output equipment has very fast response speed; avoid the radio frequency output equipment to cause the damage of device due to powerful reverse input signal, the components and parts damage that can also avoid receiving equipment to cause because input signal power is excessive.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only the specific embodiment of the present invention; the protection range that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. radio-frequency signal source with reverse protection function; comprise that a radiofrequency signal produces circuit; a transmission line; a lead-out terminal, described radiofrequency signal produces circuit and produces radiofrequency signal, and by transmission line to lead-out terminal; it is outside that lead-out terminal sends to described radio-frequency signal source with described radiofrequency signal; it is characterized in that, also comprise
Power divider, detection unit, amplifying unit, comparing unit, switch element;
Described power divider extracts a part of signal power in the reverse input signal on described transmission line, and sends described a part of signal power to detection unit;
Described detection unit is converted to d. c. voltage signal with the signal power that receives;
Described amplifying unit amplifies described d. c. voltage signal;
Described comparing unit, the d. c. voltage signal of described amplification is compared with predetermined threshold voltage, if the d. c. voltage signal of described amplification surpasses described threshold voltage, disconnect to the switch element output that is series on described transmission line the cut-off signal that connects between described radiofrequency signal generation circuit and lead-out terminal, otherwise produce to the described radiofrequency signal of described switch element output conducting the Continuity signal that connects between circuit and lead-out terminal.
2. a kind of radio-frequency signal source with reverse protection function according to claim 1, is characterized in that, the power distributing circuit of described power divider for being made of divider resistance, the perhaps power distributing circuit for being made of directional coupler.
3. a kind of radio-frequency signal source with reverse protection function according to claim 2, is characterized in that, described detection unit comprises diode detector, triode detector or amplifier wave detector.
4. a kind of radio-frequency signal source with reverse protection function according to claim 3, is characterized in that, also comprises the DAC transducer, is connected with described comparing unit, and the threshold voltage of described comparing unit is set by described DAC transducer.
5. a kind of radio-frequency signal source with reverse protection function according to claim 1, it is characterized in that, described switch element comprises relay, wherein said relay one end is connected in lead-out terminal, the other end produces between circuit and earth resistance in radiofrequency signal and switches, the connection that disconnects between described radiofrequency signal generation circuit and lead-out terminal refers to, described relay is connected described lead-out terminal with described earth resistance, the connection that the described radiofrequency signal of conducting produces between circuit and lead-out terminal refers to, described relay produces circuit with described lead-out terminal and described radiofrequency signal and is connected.
6. the reverse protection method of a radio-frequency signal source, is characterized in that comprising,
Extract a part of signal power in the reverse input signal on the transmission line that described signal source transmits radiofrequency signal;
A part of signal power of described reverse input signal is converted to d. c. voltage signal;
Described d. c. voltage signal is amplified;
The d. c. voltage signal of described amplification is compared with predetermined threshold voltage, if the d. c. voltage signal of described amplification surpasses described threshold voltage, control the connection between the described radiofrequency signal generation circuit of the switch element disconnection that is series in described transmission line and lead-out terminal, otherwise control the connection between the described radiofrequency signal generation circuit of described switch element conducting and lead-out terminal.
7. the reverse protection method of a kind of radio-frequency signal source according to claim 6, is characterized in that, with the d. c. voltage signal of described amplification with also comprise during predetermined threshold voltage is compared, regulate described threshold voltage, thereby control comparative result.
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| CN201110431264.9A CN103178483B (en) | 2011-12-21 | 2011-12-21 | A kind of radio-frequency signal source and reverse protection method with reverse protection function |
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| CN103178483B CN103178483B (en) | 2017-12-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106159896A (en) * | 2016-06-12 | 2016-11-23 | 广州杰赛科技股份有限公司 | A kind of method and device exporting overpower protection |
| CN106374422A (en) * | 2016-08-24 | 2017-02-01 | 云顶科技（江苏）有限公司 | Active antenna-based detection protection circuit |
| CN108923757A (en) * | 2018-07-02 | 2018-11-30 | 成都九洲电子信息系统股份有限公司 | The detection of radio frequency power output closed loop and regulating device |
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| CN102098007A (en) * | 2010-12-21 | 2011-06-15 | 广州杰赛科技股份有限公司 | Mismatch protection device for radio frequency (RF) amplifying circuit and method thereof |
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| CN106374422A (en) * | 2016-08-24 | 2017-02-01 | 云顶科技（江苏）有限公司 | Active antenna-based detection protection circuit |
| CN108923757A (en) * | 2018-07-02 | 2018-11-30 | 成都九洲电子信息系统股份有限公司 | The detection of radio frequency power output closed loop and regulating device |
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| CN103178483B (en) | 2017-12-22 |
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