CN202696546U - Power amplifier protection device of radio-frequency circuit and transmitter - Google Patents
Power amplifier protection device of radio-frequency circuit and transmitter Download PDFInfo
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- CN202696546U CN202696546U CN 201220258951 CN201220258951U CN202696546U CN 202696546 U CN202696546 U CN 202696546U CN 201220258951 CN201220258951 CN 201220258951 CN 201220258951 U CN201220258951 U CN 201220258951U CN 202696546 U CN202696546 U CN 202696546U
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Abstract
The utility model provides a power amplifier protection device of a radio-frequency circuit. The power amplifier protection device comprises a radio-frequency attenuator circuit, a peak amplitude limiting circuit, a power detection circuit and a control circuit; the radio-frequency attenuator circuit, the peak amplitude limiting circuit and an input end of a power amplifier are sequentially connected with one another; an input end of the power detection circuit is connected with the power amplifier; and an input end of the control circuit is connected with an output end of the power detection circuit, and an output end of the control circuit is respectively connected with the radio-frequency attenuator circuit and the peak amplitude limiting circuit. The utility model further provides a transmitter which comprises the power amplifier protection device of the radio-frequency circuit. According to the power amplifier protection device of the radio-frequency circuit, downlink signals which enter the power amplifier are in a rated bearable range, safety of the power amplifier is reliably protected, the device is applicable to all communication radio-frequency links and especially applicable to large-power power amplifiers which integrate digits and radio frequency, and the application prospect is good.
Description
Technical field
The utility model relates to the radio frequency processing technology, particularly relates to a kind of radio circuit power amplifier protector and transmitter.
Background technology
In wireless communication system, radio-frequency power amplifier is the core component of whole communication transmitter, it amplifies the radiofrequency signal after ovennodulation, then transports to antenna-feedback system and launches the effective covering that realizes radiofrequency signal, thereby reach the purpose of radio communication.
In whole communication transmitter system (comprising base station, RRU and repeater etc.); radio-frequency power amplifier occupies more than 50% of whole power consumptions; that energy consumption is maximum; the parts that operational environment is the most harsh; simultaneously also be worth the highest; failure rate is the highest, and the parts that maintenance cost is the highest are so the protection of strengthening for radio-frequency (RF) power amplification is to guarantee reliablely and stablely requisite measure of radio communication.
Along with development and the application of the 3G communication technology, the signal of transmitter transmission becomes increasingly complex: high-power, multicarrier and broadband complex modulation pattern become distinguishing feature.For guaranteeing the high-quality of signal transmission, transmitter often adopts the digital technologies such as digital pre-distortion, peak factor reduction technology to carry out Signal Pretreatment, and the software function of digital system becomes increasingly complex.
Power down on digital system is in communication transmitter, initialization, software dispose, reset, DPD (DigitalPre-Distortional, numeral is default true) is out of control when waiting stage, all might be because a variety of causes produces abnormal signal.
If the average power of input signal is excessive, the radio-frequency power amplifier power output surpasses rated power and lasting long period, then can can't shed owing to the accumulation of heat, causes the damage of radio-frequency power amplifier; If input signal is a high-power momentary pulse, surpass the stable operation range of power amplifier, can cause power tube especially moment of final stage LDMOS pipe breakdown and burn.
At present; resist technology to radio-frequency power amplifier; generally be in Base-Band Processing, to take complicated digital processing method or abnormality detection and recovery flow process; but the unusual of signal all is moment; especially high-power momentary pulse signal, and because the relation of operating frequency, above-mentioned digital processing process generally all can lag behind the regular hour; so the response speed to abnormal signal is slower, causes easily radio-frequency power amplifier in time to be effectively protected and damage.
The utility model content
Based on this; be necessary for the resist technology of general radio-frequency power amplifier slower to the response speed of abnormal signal; the problem that causes easily radio-frequency power amplifier in time to be effectively protected and damage provides a kind of radio circuit power amplifier protector and transmitter.
A kind of radio circuit power amplifier protector comprises: rf attenuation circuit, peak value amplitude limiter circuit, power-sensing circuit and control circuit;
Described rf attenuation circuit is connected with the input of power amplifier by described peak value amplitude limiter circuit;
The input of described power-sensing circuit is connected with the output of described power amplifier;
The input of described control circuit is connected with the output of described power-sensing circuit, and output is connected with the peak value amplitude limiter circuit with described rf attenuation circuit respectively.
A kind of transmitter comprises radio circuit power amplifier protector described above.
Above-mentioned radio circuit power amplifier protector and transmitter; operating power by power-sensing circuit detection power amplifier; control circuit is according to the operating power variable condition of power amplifier; output attenuatoin level signal and amplitude gate limit value are to being arranged on power amplifier front rf attenuation circuit and power peak amplitude limiter circuit; respectively the average power of downstream signal is decayed and signal peak limits; the operating power variable condition of power amplifier can obtain feedback fast; so signal of the timely response impulse signal of energy or high peak-to-average force ratio; thereby but the downstream signal that guarantees the ingoing power amplifier is in the specified tolerance range; conscientiously protected the safety of power amplifier; be applicable to all communication radio frequency links; the powerful power amplifier that particularly combines with radio frequency for numeral has good application prospect.
Description of drawings
Fig. 1 is the radio circuit power amplifier protector structural representation of an embodiment;
Fig. 2 is the radio circuit power amplifier protector structural representation of an embodiment;
Fig. 3 is the radio circuit power amplifier protector structural representation of a preferred embodiment;
Fig. 4 is the structural representation of a rf attenuation circuit 01 among the embodiment.
Embodiment
Be described in detail below in conjunction with the embodiment of accompanying drawing to radio circuit power amplifier protector of the present utility model.
Fig. 1 shows the structural representation of the radio circuit power amplifier protector of an embodiment, mainly comprises: rf attenuation circuit 01, peak value amplitude limiter circuit 02, power-sensing circuit 03 and control circuit 04.
Wherein, rf attenuation circuit 01 is connected with the input of power amplifier (PA) by peak value amplitude limiter circuit 02; The input of power-sensing circuit 03 is connected with described power amplifier; The input of control circuit 04 is connected with the output of power-sensing circuit 03, and its output is connected with the peak value amplitude limiter circuit with rf attenuation circuit 01 respectively and is connected.
In the specific works:
Peak value amplitude limiter circuit 02 limits according to the signal peak of the amplitude gate limit value of inputting from control circuit 04 to the downstream signal after overdamping.
The operating power of power-sensing circuit 03 detection power amplifier also is converted into the feedback level signal and exports control circuit 04 to.
The radio circuit power amplifier protector of present embodiment; mainly be by rf attenuation circuit 01 and peak value amplitude limiter circuit 02 are set before the power amplifier of radio circuit; thereby determined the variable condition of its power by the power of power-sensing circuit 03 detection power amplifier; and convert thereof into the feedback level signal and transport to control circuit 04; 04 pair of above-mentioned feedback level signal of control circuit carries out comparing with default parameter value; export corresponding level of attenuation signal to rf attenuation circuit 01 according to result relatively; and the output violent change threshold value is to peak value amplitude limiter circuit 02, thereby realizes downstream signal is decayed and the peak value amplitude limit.
When the abnormal conditions such as high-average power signal, momentary pulse large-signal or high peak-to-average force ratio signal in downstream signal, occurring; can respond fast and make corresponding operation effectively suppresses downstream signal; but the downstream signal that guarantees the ingoing power amplifier is in the tolerance range, reaches the purpose of protection power amplifier.
In one embodiment; as shown in Figure 2; the radio circuit power amplifier protector can also comprise that being arranged on described rf attenuation circuit 01 front out of band signal suppresses circuit 05, and described out of band signal suppresses circuit 05, is used for the band stray signal of downstream signal is carried out filtering.
Owing to may there be the outer spuious large-signal of band in the downstream signal, when the spurious signal outside these bands surpasses the bandwidth requirement of power amplifier self, owing to the reason of mismatch also can cause the power amplifier self-excitation to burn power amplifier, so, suppress circuit 05 by out of band signal, effectively the outer spuious large-signal of inhibition zone.
For more clear radio circuit power amplifier protector of the present utility model, set forth preferred embodiment below in conjunction with accompanying drawing.
Fig. 3 shows the radio circuit power amplifier protector structural representation of a preferred embodiment.
In one embodiment, out of band signal suppresses circuit 05 and comprises microstrip bandpass filter 51, and wherein, passband is designed to the useful signal transmission bandwidth.
Microstrip bandpass filter possesses preferably passband fluctuation and Out-of-band rejection, can be effectively with out of band signal filtering, the outer unwanted signal of inhibition zone.
In one embodiment, as shown in Figure 4, Fig. 4 is the schematic diagram of an embodiment of rf attenuation circuit 01, and this main circuit will comprise the first PIN diode 11, and by resistance R 1, R2, R4, R6, the peripheral circuit that capacitor C 1, C3 form.
Need to prove that peripheral circuit mainly is to cooperate PIN diode to carry out work, so that the performance of PIN diode is better, the concrete number of devices that adopts is not limited to above-mentioned form.
Wherein, the negative end of the first PIN diode 11 is the input of rf attenuation circuit 01, and the first forward end is the output of rf attenuation circuit 01, and connects the output of control circuit 04 by R6, and the second forward end connects the 5V DC power supply.
R2, R1 are connected in series between second forward end and 5V DC power supply of the first PIN diode 11 successively, and the negative end of the first PIN diode 11 is by R4 ground connection.
The end of C1 is connected between R1 and the R2, and the end of C3 is connected between the second forward end of R2 and the first PIN diode 11, and the other end of C1, C3 is ground connection respectively, and C1, C3 are mainly used in filtering;
In the specific works, the first PIN diode 11 receives the level of attenuation signal of described control circuit 04 output, controls the conducting degree of self, and when the level of attenuation signal was positive level, the higher then conducting degree of level was lower, and pad value is just larger.
As preferred embodiment a kind of, as shown in Figure 3, rf attenuation circuit 01 adopts two PIN diode, namely on the basis of rf attenuation circuit 01 shown in Figure 4, also comprise the second PIN diode 12, and by resistance R 3, R5, the peripheral circuit that capacitor C 2, C4 form.
Need to prove that peripheral circuit mainly is to cooperate PIN diode to carry out work, so that the performance of PIN diode is better, the concrete number of devices that adopts is not limited to above-mentioned form.
The negative end of described the second PIN diode 12 is the output of rf attenuation circuit 01, and the first forward end is connected with the first forward end of described the first PIN diode 11, and connects the output of control circuit 04 by R6, and the second forward end connects the 5V DC power supply.
R3 is connected between the second forward end of R1 and the second PIN diode 12, and the negative end of the second PIN diode 12 is by R5 ground connection.
The end of C2 is connected between R1 and the R3, and the end of C4 is connected between the second forward end of R3 and the second PIN diode 12, and the other end of C2, C4 is ground connection respectively, and C2, C4 are mainly used in filtering;
In the specific works, the level of attenuation signal of the second PIN diode 12 reception control circuits 04 output is controlled self conducting degree, and when the level of attenuation signal was positive level, the higher then conducting degree of level was lower, and pad value is just larger; The first PIN diode 11 be connected PIN diode 12 and be connected with the output of control circuit 04 by resistance R 6, generally speaking, the value of capacitor C 1, C2, C3, C4 is respectively 47pF, the value of resistance R 6 is 330 ohm.
The design of two PIN diode series connection of above-mentioned employing can be so that the dynamic effect of decay be better.
In one embodiment, peak value amplitude limiter circuit 02 comprises radio frequency limiter diode 21 and biasing circuit 22, preferably, can also comprise the C6 that strobes and the C7 that connect radio frequency link input and output.
One end ground connection of described radio frequency limiter diode 21, the other end is connected with radio frequency link and biasing circuit 22, and biasing circuit 22 connects the output of control circuit 04.
In the specific works, biasing circuit 22 can be isolated radiofrequency signal, prevents radiofrequency signal interference control circuit 04; When amplitude gate limit value during greater than the withstand voltage of the reverse voltage of radio frequency limiter diode 21, over the ground conducting of radio frequency limiter diode 21, response time is the ON time of radio frequency limiter diode 21, biasing circuit 22 comprises inductance L 1, the type of L1 is the inductance of Wound-rotor type, generally speaking, its value is 22nH.
In one embodiment, power-sensing circuit 03 comprises current sampling resistor R9, current detecting chip 31 and operational amplification circuit; Wherein, operational amplification circuit is the in-phase proportion amplifying circuit, mainly is comprised of the first operational amplifier 32, input resistance R8, output resistance R7 and balance resistance R10.
Current sampling resistor R9 is connected with power amplifier, and the anode of current detecting chip 31 is connected with negative terminal by circuit sampling resistance R 9, and output is connected with the in-phase input end of operational amplification circuit.
In the specific works, the operating current of radio-frequency power amplifier PA output is through current sampling resistor R9, current detecting chip 31 detects the electric current of radio-frequency power amplifier PA and calculates a d. c. voltage signal, carries out obtaining feedback level signal V1 behind the differential amplification through the first operational amplifier 32 and exports control circuit 04 to.
Wherein, the resistance size of R7 and R8 can actual multiplication factor as required be selected, and multiplication factor A computing formula is as follows: A=(1+R7/R8), generally speaking, R7, R8 value are 1k ohm, and R10 is used for the voltage isolation, and general value is 1k ohm.
In one embodiment, control circuit 04 comprises microprocessor 41 and operational amplifier 42, and wherein, microprocessor 41 comprises DAC end (DAC1) and the 2nd DAC end (DAC2).
The 2nd DAC end is connected with the biasing circuit 22 of peak value amplitude limiter circuit 02, and DAC end is connected with the negative terminal of operational amplifier 42, and the output of operational amplifier 42 is connected with the R6 of rf attenuation circuit 01.
Reference level of DAC end output of microprocessor 41, operational amplifier carries out differential amplification with feedback level signal and this reference level, and the output attenuatoin level signal is to the R6 of rf attenuation circuit 01, and the 2nd DAC end output violent change threshold value is to the biasing circuit 22 of peak value amplitude limiter circuit 02.
In the specific works, carry out differential amplification from level signal V1 and microprocessor 41 DAC end output reference level signal of power-sensing circuit 03 input through operational amplifier 42, the level of V1 when reference level signal is set to the power amplifier maximum rated power, when the V1 level is higher than reference level signal, then become a positive level signal through behind the differential amplification, export the R6 of rf attenuation circuit 01 to, control the conducting degree of rf attenuation circuit 01 by the voltage difference between the voltage on the R6 and the 5V voltage, simultaneously, level signal of microprocessor 41 the 2nd DAC end output is controlled over the ground conducting of peak value amplitude limiter circuit 02 to the biasing circuit 22 of peak value amplitude limiter circuit 02 by this level signal.
The below is described in detail the embodiment of the utility model transmitter.
A kind of transmitter comprises the described radio circuit power amplifier protector such as above-mentioned embodiment; by this radio circuit power amplifier protector; the operating power variable condition of the power amplifier of transmitter of the present utility model can obtain feedback fast; the signal of the timely response impulse signal of energy or high peak-to-average force ratio; but the downstream signal that guarantees the ingoing power amplifier is in the specified tolerance range, conscientiously protects the safety of power amplifier.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (9)
1. a radio circuit power amplifier protector is characterized in that, comprising: rf attenuation circuit, peak value amplitude limiter circuit, power-sensing circuit and control circuit;
Described rf attenuation circuit is connected with the input of power amplifier by described peak value amplitude limiter circuit;
The input of described power-sensing circuit is connected with the output of described power amplifier;
The input of described control circuit is connected with the output of described power-sensing circuit, and output is connected with the peak value amplitude limiter circuit with described rf attenuation circuit respectively.
2. radio circuit power amplifier protector according to claim 1 is characterized in that, comprises that also being arranged on the front out of band signal of described rf attenuation circuit suppresses circuit.
3. radio circuit power amplifier protector according to claim 2 is characterized in that, described out of band signal suppresses circuit and comprises microstrip bandpass filter.
4. according to claim 1 to 3 each described radio circuit power amplifier protectors, it is characterized in that described rf attenuation circuit comprises the first PIN diode;
The negative end of described the first PIN diode is the input of rf attenuation circuit;
The first forward end of described the first PIN diode is the output of rf attenuation circuit, and connects the output of described control circuit, and the second forward end connects a 5V DC power supply.
5. radio circuit power amplifier protector according to claim 4 is characterized in that, described rf attenuation circuit also comprises the second PIN diode;
The negative end of described the second PIN diode is the output of rf attenuation circuit;
The first forward end of described the second PIN diode is connected with the first forward end of described the first PIN diode, and connects the output of described control circuit, and the second forward end connects a 5V DC power supply.
6. according to claim 1 to 3 each described radio circuit power amplifier protectors, it is characterized in that described peak value amplitude limiter circuit comprises: radio frequency limiter diode and biasing circuit;
One end ground connection of described radio frequency limiter diode, the other end is connected with radio frequency link and described biasing circuit, and described biasing circuit connects the output of described control circuit.
7. according to claim 1 to 3 each described radio circuit power amplifier protectors, it is characterized in that described power-sensing circuit comprises: current detecting chip, current sampling resistor and operational amplification circuit;
Described current sampling resistor is connected with power amplifier;
The anode of described current detecting chip is connected with negative terminal by current sampling resistor;
The output of described current detecting chip is connected with the in-phase input end of operational amplification circuit.
8. according to claim 1 to 3 each described radio circuit power amplifier protectors, it is characterized in that described control circuit comprises: microprocessor and operational amplifier;
The one DAC end of described microprocessor is connected with described peak value amplitude limiter circuit;
The 2nd DAC end of described microprocessor is connected with the negative terminal of described operational amplifier;
The output of described operational amplifier is connected with described rf attenuation circuit.
9. a transmitter is characterized in that, comprises each described radio circuit power amplifier protector of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258951 CN202696546U (en) | 2012-06-01 | 2012-06-01 | Power amplifier protection device of radio-frequency circuit and transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258951 CN202696546U (en) | 2012-06-01 | 2012-06-01 | Power amplifier protection device of radio-frequency circuit and transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202696546U true CN202696546U (en) | 2013-01-23 |
Family
ID=47552098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220258951 Expired - Lifetime CN202696546U (en) | 2012-06-01 | 2012-06-01 | Power amplifier protection device of radio-frequency circuit and transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202696546U (en) |
-
2012
- 2012-06-01 CN CN 201220258951 patent/CN202696546U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130123 |