CN103401516B - A kind of radio frequency protector - Google Patents
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- CN103401516B CN103401516B CN201310317212.8A CN201310317212A CN103401516B CN 103401516 B CN103401516 B CN 103401516B CN 201310317212 A CN201310317212 A CN 201310317212A CN 103401516 B CN103401516 B CN 103401516B
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Abstract
The invention discloses a kind of radio frequency protector, for realizing RF power amplifying device microminiaturization, this radio frequency protector comprises the radio frequency input protection unit that integrated design is also electrically connected with same rf attenuation circuit unit, auto level control ALC unit, temperature compensation unit, automatic growth control AGC unit and signal selecting circuit unit, signal selecting circuit unit is used for after the upset of the input protection control voltage of acquisition, compare with the AGC control voltage obtained and ALC control voltage respectively, using voltage corresponding for low level voltage as the output control voltage controlling described rf attenuation circuit unit.
Description
Technical field
The present invention relates to mobile communication technology field, especially relate to a kind of radio frequency protector.
Background technology
RF power amplifying device is commonly used to increase signal transmission power in mobile communications industry, spread signal coverage.
Along with the development of mobile communication technology, the mobile communication technology of various standard is constantly perfect, and signal of communication is also more complicated.Generally; the auto level control of radio frequency power amplification device control and protection is (English: AutomaticLevelControl; abbreviation: ALC) circuit, automatic growth control (English: AutomaticGainControl, abbreviation: AGC) circuit, temperature compensation circuit, radio frequency input protection circuit adopt Distributed Design.Such as traditional large-signal input cannot evaded the alc circuit design of output feedback, the impact of this large-signal input radio frequency power amplification device that cannot evade cannot be left in the basket, especially high-power product and coordinate linearization technique product design in, power amplifying device has been operated in close to saturated or saturation condition, and the reliability of over proof signal excitation meeting radio frequency power amplification device impacts.And traditional simulation alc circuit, starting to control the degree of depth has certain thresholding, if exceed this to start to control degree of depth threshold value, can cause beating of alc circuit Automatic level control thresholding, and then affect the reliability of RF power amplifying device.Along with the addressing of mobile communication equipment is more difficult; radio frequency power amplification device is then needed to carry out microminiaturized product design; the area that the alc circuit of traditional distributed design, agc circuit, temperature compensation circuit, radio frequency input protection circuit take is comparatively large, therefore cannot realize RF power amplifying device microminiaturization.
In sum, the area generally taken for the alc circuit of the Distributed Design of RF power amplifying device control and protection, agc circuit, temperature compensation circuit, radio frequency input protection circuit is comparatively large, cannot realize RF power amplifying device microminiaturization.
Summary of the invention
Embodiments provide a kind of radio frequency protector, the area taken is less, can realize RF power amplifying device microminiaturization preferably.
A kind of radio frequency protector, comprise radio frequency input protection unit, auto level control ALC unit, temperature compensation unit, automatic growth control AGC unit, signal selecting circuit unit and rf attenuation circuit unit, wherein: described radio frequency input protection unit, power for the radio-frequency input signals of radio frequency attenuator circuit unit front end is sampled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the first quantification voltage; And compared with the threshold voltage of setting respectively by the obtain first quantification voltage, and described threshold voltage comprises high threshold voltage value and low threshold voltage value, according to comparative result, exports input protection control voltage; Described temperature compensation unit, for sampling to temperature signal, exports the temperature signal that obtains of sampling, and after the sample temperature signal obtained and the comparative voltage initial value of presetting are carried out computing, exports temperature variant comparative voltage; Described ALC unit, radio-frequency input signals for radio frequency power amplification device front end is sampled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the second quantification voltage, and obtain the comparative voltage of described temperature compensation unit output, compare described second of acquisition based on integral operation and quantize voltage and comparative voltage, export ALC control voltage according to comparative result; Described AGC unit, for obtaining the temperature signal that temperature compensation unit exports, and after the temperature signal of acquisition and default AGC control voltage initial value are carried out computing, exports temperature variant AGC control voltage; Described signal selecting circuit unit, after input protection control voltage for obtaining overturns, compare with the AGC control voltage obtained and ALC control voltage respectively, according to comparative result, the control signal that output low level voltage is corresponding controls the output control voltage of described rf attenuation circuit unit; Described rf attenuation circuit unit, for the control signal exported according to the signal selecting circuit unit obtained, controls to decay to the radiofrequency signal of input, and the radiofrequency signal after decay is exported to RF power amplifying device.
By adopting technique scheme, radio frequency protector comprises the radio frequency input protection unit be also electrically connected with same rf attenuation circuit unit of integrated design, ALC unit, temperature compensation unit, AGC unit and signal selecting circuit unit, due to radio frequency input protection unit, ALC unit, the same rf attenuation circuit unit of AGC units shared, and the input protection control voltage exported at radio frequency input protection unit by signal selecting circuit unit, a road voltage turn-on is selected in the ALC control voltage that ALC unit exports and the AGC control voltage that AGC unit exports, by other two-way voltage shield, thus realize the control of radio frequency attenuator circuit unit, middle radio frequency input protection unit compared to existing technology, ALC unit, AGC unit needs the radio frequency protector of three rf attenuation circuit units, avoid the area taken due to radio frequency protector larger, achieve RF power amplifying device microminiaturization preferably.
Accompanying drawing explanation
Fig. 1 is in the embodiment of the present invention, the composition of the radio frequency protector structure based on the hysteresis comparator schematic diagram of proposition;
Fig. 2 is in the embodiment of the present invention, the input and output voltage characteristic schematic diagram of the hysteresis comparator of proposition;
Fig. 3 is in the embodiment of the present invention, the radio frequency guard method flow chart based on hysteresis comparator of proposition.
Embodiment
For the alc circuit of the Distributed Design for RF power amplifying device control and protection existed in prior art, agc circuit, temperature compensation circuit, the area that radio frequency input protection circuit takies is larger, the problem of RF power amplifying device microminiaturization cannot be realized, in the technical scheme that the embodiment of the present invention proposes, radio frequency protector comprises the radio frequency input protection unit be also electrically connected with same rf attenuation circuit unit of integrated design, ALC unit, temperature compensation unit, AGC unit and signal selecting circuit unit, due to radio frequency input protection unit, ALC unit, the same rf attenuation circuit unit of AGC units shared, and the input protection control voltage exported at radio frequency input protection unit by signal selecting circuit unit, a road voltage turn-on is selected in the ALC control voltage that ALC unit exports and the AGC control voltage that AGC unit exports, by other two-way voltage shield, thus realize the control of radio frequency attenuator circuit unit, middle radio frequency input protection unit compared to existing technology, ALC unit, AGC unit needs the radio frequency protector of three rf attenuation circuit units, avoid the area taken due to radio frequency input protection circuit larger, achieve RF power amplifying device microminiaturization preferably.
Below in conjunction with each accompanying drawing, the main of embodiment of the present invention technical scheme is realized principle, embodiment and set forth in detail the beneficial effect that should be able to reach.
As shown in Figure 1; the embodiment of the present invention proposes a kind of radio frequency protector; in the embodiment of the present invention and accompanying drawing 1; provide with based on the radio frequency protector controlling ALC, AGC, temperature compensation integrated before hysteresis comparator, comprise integrated design and and same rf attenuation circuit unit 51 the radio frequency input protection unit 11, ALC unit 14, temperature compensation unit 13, AGC unit 15 and the signal selecting circuit unit 16 that are electrically connected.
Wherein, in the technical scheme that the embodiment of the present invention proposes, radio frequency protector can as one independently equipment be positioned at RF power amplifying device front end, also can as an integration module, as a part for RF power amplifying device.Preferably, the embodiment of the present invention for radio frequency protector as one independently equipment be positioned at RF power amplifying device front end to be described in detail.
Radio frequency input protection unit 11, the power of the radio-frequency input signals of radio frequency attenuator circuit unit 51 front end is sampled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the first quantification voltage; And compared with the threshold voltage of setting respectively by the obtain first quantification voltage, and threshold voltage comprises high threshold voltage value and low threshold voltage value, according to comparative result, exports input protection control voltage.
Radio frequency input protection unit 11, comprising the detecting circuit 110 being positioned at rf attenuation circuit unit 51 front end, inputing to the radio-frequency input signals of rf attenuation circuit unit 51 for being coupled.The power of the radio-frequency input signals of radio frequency attenuator circuit unit 51 front end is sampled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the first quantification voltage.
For ease of setting forth, the embodiment of the present invention quantizes voltage and adopts V1 to represent by first.Wherein, first of the performance number that radio frequency input protection unit 11 samples and output quantizes between voltage V1; there is relation one to one; namely the power of the radio-frequency input signals of radio frequency attenuator circuit unit 51 front end carry out the sampling performance number that obtains is larger; then corresponding conversion is the first higher quantification voltage; the power of the radio-frequency input signals of the radio frequency attenuator circuit unit 51 front end performance number obtained of carrying out sampling is less, then corresponding conversion is lower first quantize voltage.
Radio frequency input protection unit 11 also comprises hysteresis comparator 12; hysteresis comparator 12 obtains the first quantification voltage be converted to; quantize voltage by obtain first to compare with the threshold voltage of setting respectively; and threshold voltage comprises high threshold voltage value and low threshold voltage value; according to comparative result, export input protection control voltage.
Particularly, above-mentioned hysteresis comparator 12, if quantize voltage specifically for first to be not less than high threshold voltage value, exports the input protection control voltage identical with the first predetermined threshold value; And if the first quantification voltage obtained is less than low threshold voltage value; export the input protection control voltage identical with the second predetermined threshold value; if obtain first quantizes voltage between the high threshold voltage value and low threshold voltage value of setting, then keep the input protection control voltage of previous output constant.
Wherein, hysteresis comparator 12 obtains the first quantification voltage V1; and carry out comparison operation; thus obtain according to comparative result the voltage that two-way has identical magnitude of voltage; as shown in Figure 1; wherein a road voltage exports to signal selecting circuit unit 16 as input protection control voltage V5, and another road voltage V2, can export to signal processor.The magnitude of voltage of V5 and V2 is equal, just different for the function realized.
Radio frequency input protection unit 11, if when the input protection control voltage also for exporting being not less than the 3rd predetermined threshold value, producing indicative input and reaching the overpowering alarm signal of input to the radio-frequency input signals of rf attenuation circuit unit.Wherein, the 3rd predetermined threshold value can be equal with above-mentioned first predetermined threshold value.Particularly; when the first quantification voltage is not less than default high threshold voltage value; hysteresis comparator 12 exports the input protection control voltage equal with the first predetermined threshold value; this input protection control voltage is high level voltage value; hysteresis comparator 12 exports altogether the identical input protection control voltage of two-way; wherein a road input protection control voltage V5 exports to signal selecting circuit unit 16; an other road input protection control voltage V2 exports to signal processor, and signal processor is by being sampled as high level report and alarm signal.
Radio frequency input protection unit 11; also comprise signal processor; if when the input protection control voltage V2 for hysteresis comparator 12 output is not less than the 3rd predetermined threshold value, produces indicative input and reach the overpowering alarm signal of input to the radio-frequency input signals of rf attenuation circuit unit 51.
As shown in Figure 2, according to the input-output characteristic of hysteresis comparator, the first quantification voltage that hysteresis comparator 12 obtains detecting circuit 110 output adopts V1 to represent, supposes that the high threshold voltage value set adopts U
iHrepresent, the low threshold voltage value of setting adopts U
iLrepresent, the high threshold voltage value U of setting
iHbe greater than the low threshold voltage value U of setting
iL.
As shown in Figure 2, if the first quantification voltage V1 obtained is more than or equal to the high threshold voltage value U of setting
iH, export the input protection control voltage identical with the first predetermined threshold value that two-way is equal, the first predetermined threshold value adopts Uomax to represent.Even V1>=U
iHtime, the two-way magnitude of voltage V2=V5=Vout=Uomax=high level voltage that hysteresis comparator 12 exports.
If the first quantification voltage V1 obtained is less than the low threshold voltage value U of setting
iL, export the input protection control voltage identical with the second predetermined threshold value that two-way is equal, the second predetermined threshold value adopts Uomin to represent, can be 0.Even V1<U
iLtime, the two-way magnitude of voltage V2=V5=Vout=Uomin=0=low level voltage that hysteresis comparator 12 exports.
If the first quantification voltage V1 obtained is more than or equal to the low threshold voltage value U of setting
iL, be less than the high threshold voltage value U of setting simultaneously
iHtime, then export the two-way input protection control voltage identical with the magnitude of voltage of previous output.Namely in this kind of situation, U
iL≤ V1<U
iHtime, if the input protection control voltage that last hysteresis comparator 12 exports is Uomax, then this two-way voltage exported is still V2=V5=Vout=Uomax.Similarly, if the input protection control voltage that last hysteresis comparator 12 exports is Uomin, then this two-way voltage exported is still V2=V5=Vout=Uomin=0.
The radio-frequency (RF) input power of radio frequency input protection circuit 11 radio frequency attenuator circuit unit 51 front end is sampled, and exports hysteresis comparator 12 to after the performance number one_to_one corresponding sampled is converted to the first quantification voltage.After hysteresis comparator 12 obtains the first quantification voltage, quantize voltage by obtain first and compare with the high threshold voltage value set and low threshold voltage value respectively, export different control voltages according to comparative result.Along with the continuous increase of input signal; the first quantification voltage that sample conversion is also constantly increases; when the first quantification voltage is not less than the high threshold voltage value of setting; hysteresis comparator 12 exports the voltage signal of high level; low level voltage signal is converted to after this voltage signal entering signal selection circuit; playing a leading role and controlling rf attenuation circuit unit is maximum attenuation value, realizes defencive function and report and alarm.When the radio-frequency power value of input reduces; such as, when reducing from the alarming threshold of setting; when the first quantification voltage is between the high threshold voltage value and low threshold voltage value of setting; hysteresis comparator 12 maintains the constant voltage signal of the output of last time, and RF power amplifying device is still in guard mode.When the radiofrequency signal of input reduces further, corresponding first quantizes voltage also can reduce, and when the first quantification voltage is decreased to the low threshold voltage value of setting, the output voltage of hysteresis comparator overturns, and alarm protection recovers.Therefore, the introducing of hysteresis comparator, avoiding input power alarm clearing switching frequently when setting near threshold value, affecting the experience of user and the safety of equipment.
Temperature compensation unit 13, samples to temperature signal, and exports the temperature signal that obtains of sampling, and after the sample temperature signal obtained and the comparative voltage initial value of presetting are carried out computing, exports temperature variant comparative voltage.
Wherein, temperature compensation unit comprises temperature sensing circuit 131 and signal processor 132.Temperature sensing circuit 131 pairs of temperature detection signal samplings, after the temperature signal that signal processor 132 obtains for being sampled by temperature sensing circuit 131 and the comparative voltage initial value preset carry out computing, export temperature variant comparative voltage.Comparative voltage is exported to ALC unit 14.For ease of setting forth, as shown in Figure 1, the comparative voltage exported by temperature compensation unit 13 adopts V4 to represent.
In the radio frequency protector that the embodiment of the present invention proposes, signal processor 132, serves whole radio frequency protector.Such as signal processor 132 can pass through analog/digital (A/D) sampling, the voltage V2 exported by hysteresis comparator 12 is converted into digital quantity, then compare with the alarming threshold set, judge whether to need reporting radio frequency power amplification device to input overpower alarm.And for example, signal processor 132 serves temperature compensation unit 13, and temperature sensing circuit 131 is electrically connected.Signal processor 132 control temperature testing circuit 131; A/D sampling is carried out to temperature detection signal; and change through digital-to-analog (D/A); export the voltage signal of the temperature variant comprehensive function relation of two-way; signal processor 132 also serves AGC unit; for exporting AGC control voltage, and signal processor 132 also serves radio frequency input protection unit, for outputting alarm signal.V7 and V4 as shown in Figure 1, wherein a road voltage signal exports to signal selecting circuit unit 16 as AGC control voltage V7, and an other road voltage signal exports to ALC unit 14 as comparative voltage V4.
ALC unit 14, the radio-frequency input signals inputing to described RF power amplifying device front end is sampled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the second quantification voltage, and obtain the comparative voltage of temperature compensation unit 13 output, compare second of acquisition based on integral operation and quantize voltage and comparative voltage, export ALC control voltage according to comparative result.
ALC unit 14, comprise the detecting circuit 141 and integral operation circuit 142 that are positioned at RF power amplifying device 52 front end, be positioned at the detecting circuit of RF power amplifying device 52 front end, the radio-frequency input signals of RF power amplifying device 52 is inputed to for being coupled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the second quantification voltage, and obtain the comparative voltage of temperature compensation unit 13 output, compare second of acquisition based on integral operation and quantize voltage and comparative voltage, export ALC control voltage according to comparative result.
Particularly, be positioned at the detecting circuit 141 of RF power amplifying device 52 front end, coupling inputs to the radio-frequency input signals of RF power amplifying device 52 front end, and the performance number be coupled to is converted to the second quantification voltage, for ease of setting forth, second quantizes voltage adopts V3 to represent.The performance number sampled at the detecting circuit 141 of RF power amplifying device 52 front end and second of output quantizes to have relation one to one between voltage V3, namely the comparatively large then corresponding conversion of the performance number that the detecting circuit 141 being positioned at RF power amplifying device 52 front end samples is the second higher quantification voltage, and the performance number that the detecting circuit 141 being positioned at RF power amplifying device 52 front end samples is less, and correspondence is converted into the second lower quantification voltage.
Wherein, integral operation circuit 142, obtain the comparative voltage V4 that temperature compensation unit 13 exports, relatively obtain second quantizes voltage V3 and comparative voltage V4, if second quantizes voltage V3 be less than comparative voltage V4, integral operation circuit 142 exports the ALC control voltage of high level, and for ease of setting forth, ALC control voltage adopts V6 to represent; If second quantizes voltage V3 be more than or equal to comparative voltage V4, the ALC control voltage V6 of integral operation circuit 142 output low level.Namely before RF power amplifying device 52 does not reach rated power output, second quantizes voltage V3 < comparative voltage V4, the ALC control voltage V6 that integral operation circuit 142 exports continues to remain on high level state, along with the increase of RF power amplifying device 52 input signal, when second quantizes voltage V3 >=comparative voltage V4, the output of integral operation circuit 142 overturns, and the ALC control voltage V6 of output is low level voltage.
In the technical scheme that the embodiment of the present invention proposes, the radio-frequency power of ALC unit 14 pairs of input radio frequency power amplification devices 52 is sampled, and high-power signal can be avoided preferably to enter RF power amplifying device affects its reliability.
Not shown in AGC unit 15(Fig. 1), obtain the temperature signal that temperature compensation unit 13 exports, and after the temperature signal obtained and default AGC control voltage initial value are carried out computing, export temperature variant AGC control voltage, and the AGC control voltage of acquisition is exported to signal selecting circuit unit 16.AGC unit comprises signal processor 132, for obtaining the temperature signal that temperature compensation unit 13 exports, and after the temperature signal obtained and default AGC control voltage initial value are carried out computing, exports temperature variant AGC control voltage.
From the above, as the voltage signal V7 of AGC control voltage, and export the voltage signal that comparative voltage V4 that ALC unit makes comparisons is temperature variant comprehensive function relation to, thus realize that ALC controls, AGC controls and the integrated design of temperature-compensating.Because the control voltage of radio frequency input protection unit, ALC unit, AGC unit shares a rf attenuation circuit by signal selecting circuit; thus realize ALC, AGC, temperature compensation circuit, the integrated design of radio frequency input protection circuit, realize the miniaturization of Control protection.Because alc circuit is from the coupling of equipment input link, compared with the circuit be coupled with output, avoid high-power signal damages power amplifying device wherein risk by RF power amplifying device.
Signal selecting circuit unit 16; after the input protection control voltage obtained is overturn, compare, according to comparative result with the AGC control voltage obtained and ALC control voltage respectively; export the control signal corresponding with low level voltage, control the output control voltage of rf attenuation circuit unit 51.
Rf attenuation circuit unit 51, for obtaining the radiofrequency signal of input, according to the control signal that the signal selecting circuit unit 16 obtained exports, controls described radio frequency signal attenuation, and the radiofrequency signal after decay is exported to RF power amplifying device 52.
Wherein signal selecting circuit unit 16 can comprise in signal selecting circuit 161(Fig. 1 not shown), for when RF power amplifying device power output does not reach rated power, and for the ALC control voltage of high level voltage and acquisition is high level voltage after the input protection control voltage upset obtained, when the AGC control voltage obtained is low level voltage, select AGC control voltage as the output control voltage controlling rf attenuation circuit unit 51; And when RF power amplifying device 52 power output has reached rated power, and for the AGC control voltage of high level voltage, acquisition is high level voltage after the input protection control voltage upset obtained, the ALC control voltage obtained is low level voltage, then select ALC control voltage as the output control voltage controlling rf attenuation circuit unit 51; Quantize voltage first identical with the high threshold voltage value of setting, when the input protection control voltage upset of acquisition is for low level, then select input protection control voltage as the output control voltage controlling rf attenuation circuit unit 51.
It should be noted that; the high level voltage that above-mentioned signal selecting circuit unit obtains and low level voltage; refer to input protection control voltage, AGC control voltage and ALC control voltage that signal selecting circuit unit obtains; maximum or minimum in three voltages; high level voltage value can be 5V, 15V, 30V etc.; low level voltage value can be 0V, can be 1V etc.High level voltage and low level voltage are comparatively speaking, not strict regulation.
Particularly, input protection control voltage V5, AGC control voltage V7, ALC control voltage V6 equal input signal selection circuit unit 16, signal selecting circuit unit 16 is by triode and voltage pull-up, input protection control voltage V5 is produced upset, according to the output characteristic of hysteresis comparator, direct output high level or low level 0V, voltage after corresponding upset is low level 0V or high level, and judged by the characteristic of diode forward conduction, by V5 overturn after voltage respectively with V6, V7 compares, low level is wherein selected to lead directly to, and by other two-way voltage shield.
Along with the increase of radio-frequency input signals; when RF power amplifying device 52 power output does not arrive rated power; be low level relatively for high level, ALC control voltage V6 are high level, AGC control voltage V7 after input protection control voltage V5 overturns; AGC control voltage V7 optionally leads directly to by signal selecting circuit unit 16; control voltage as rf attenuation circuit unit 51 controls its decay; input protection control voltage V5, ALC control voltage V6 are shielded simultaneously; ensure that RF power amplifying device link gain is stablized, realize the function of AGC.When RF power amplifying device 52 power output reaches rated power; ALC control voltage V6 is voltage minimum in three tunnel control voltages; ALC control voltage V6 optionally leads directly to by signal selecting circuit unit 16; control voltage as rf attenuation circuit unit controls its decay; input protection control voltage V5, AGC control voltage V7 shield; ensure that RF power amplifying device 52 stable output power is in rated power state, realizes ALC function.When the shutter being increased to setting of radio-frequency input signals is prescribed a time limit; input protection control voltage V5 is low level 0V after overturning; input protection control voltage V5 optionally leads directly to by signal selecting circuit unit 16; control voltage as rf attenuation circuit unit controls it and decays to maximum; ALC control voltage V6, AGC control voltage V7 shield; and report and alarm is compared in signal processor 132, ensure RF power amplifying device safety, realize radio frequency input protection function.By suitable parameter designing; input protection thresholding is arranged on after RF power amplifying device starts to control; alc circuit starts to control in stability range; make to cause starting to control radiofrequency signal and can not inputing to RF power amplifying device of alc circuit Automatic level control instability, ensure RF power amplifying device safety.
In the technical scheme of the above-mentioned proposition of the present invention, during ALC unit, AGC unit, temperature compensation unit, radio frequency input protection circuit unit integral are established, along with the increase of radio-frequency input signals, when RF power amplifying device power output does not arrive rated power, AGC control voltage optionally leads directly to by signal selecting circuit, control voltage as rf attenuation circuit controls its decay, input protection control voltage, ALC control voltage shield, ensure that RF power amplifying device link gain is stablized, realize AGC function; When RF power amplifying device power output reaches rated power, ALC control voltage optionally leads directly to by signal selecting circuit, control voltage as rf attenuation circuit controls its decay, input protection control voltage, AGC control voltage shield, ensure that RF power amplifying device stable output power is in rated power state, realizes ALC function; When the shutter being increased to setting of radio-frequency input signals is prescribed a time limit; input protection control voltage optionally leads directly to by signal selecting circuit; control voltage as rf attenuation circuit controls it and decays to maximum; input protection control voltage, ALC control voltage shield; and report and alarm is compared in signal processor; ensure RF power amplifying device safety, realize radio frequency input protection function.By suitable parameter designing; input protection thresholding is arranged on after RF power amplifying device starts to control; alc circuit starts to control in stability range; make to cause deeply starting to control radiofrequency signal and can not inputing to RF power amplifying device of alc circuit Automatic level control instability, ensure RF power amplifying device safety.
The radio frequency protector that the embodiment of the present invention proposes; ALC unit, AGC unit, the temperature compensation unit comprising temperature compensation circuit, the radio frequency input protection unit that comprises radio frequency input protection circuit are carried out integrated design, and is no longer Distributed Design of the prior art.
Correspondingly; the embodiment of the present invention also proposes a kind of method realizing radio frequency protection based on above-mentioned radio frequency protector; comprise radio frequency input protection unit, auto level control ALC unit, temperature compensation unit, automatic growth control AGC unit and signal selecting circuit unit that integrated design is also electrically connected with same rf attenuation circuit unit; as shown in Figure 3, its concrete handling process is as following:
Step 31, signal selecting circuit unit obtains input protection control voltage, the AGC control voltage of AGC unit output and the ALC control voltage of ALC unit output that radio frequency input protection unit exports.
Wherein, input protection control voltage is that the obtain first quantification voltage obtains with the threshold voltage of setting by radio frequency input protection unit respectively more afterwards, first quantification voltage is that the carrying out of the radio-frequency input signals of radio frequency input protection unit radio frequency attenuator circuit unit front end is sampled, and obtain after the performance number of the radio-frequency input signals obtained of sampling is changed, AGC control voltage is sampled to temperature signal, and the voltage that the input protection control voltage that the described radio frequency input protection unit of the temperature signal obtained sampling and acquisition exports exports after carrying out computing, to be ALC unit by obtain after the radio-frequency input signals sampling inputing to RF power amplifying device front end second quantize voltage to ALC control voltage and described temperature compensation unit is sampled to temperature signal, and the voltage that the comparative voltage that the input protection control voltage that the described radio frequency input protection unit of the temperature signal obtained sampling and acquisition exports exports after carrying out computing obtains more afterwards based on integral operation.
Step 32; after the input protection control voltage obtained overturns by signal behavior unit; compare with the AGC control voltage obtained and ALC control voltage respectively, according to comparative result, the control signal that output low level voltage is corresponding controls the output control voltage of described rf attenuation circuit unit.
When RF power amplifying device power output does not reach rated power; and be high level voltage by rear for the upset of the input protection control voltage of the acquisition ALC control voltage for high level voltage and acquisition; the AGC control voltage obtained is low level voltage, then select AGC control voltage to control the output control voltage of described rf attenuation circuit unit as control signal.When RF power amplifying device power output has reached rated power; and for the AGC control voltage of high level voltage, acquisition is high level voltage after the input protection control voltage upset obtained; the ALC control voltage obtained is low level voltage, then select ALC control voltage to control the output control voltage of described rf attenuation circuit unit as control signal.Quantize voltage first identical with the high threshold voltage value of setting, when the input protection control voltage upset of acquisition is for low level voltage, then select input protection control voltage to control the output control voltage of rf attenuation circuit unit as control signal.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. a radio frequency protector; it is characterized in that; described radio frequency protector comprises radio frequency input protection unit, auto level control ALC unit, temperature compensation unit, automatic growth control AGC unit, signal selecting circuit unit and rf attenuation circuit unit, wherein:
Described radio frequency input protection unit, the power for the radio-frequency input signals of radio frequency attenuator circuit unit front end is sampled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the first quantification voltage; And the obtain first quantification voltage is compared with the threshold voltage of setting respectively, and described threshold voltage comprises high threshold voltage value and low threshold voltage value, according to comparative result, export input protection control voltage, wherein said radio frequency input protection unit comprises the detecting circuit being positioned at rf attenuation circuit unit front end, and hysteresis comparator; The described detecting circuit being positioned at rf attenuation circuit unit front end, inputs to the radio-frequency input signals of rf attenuation circuit unit for being coupled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the first quantification voltage; Described hysteresis comparator, compare with the threshold voltage of setting respectively for quantizing voltage by obtain first, and described threshold voltage comprises high threshold voltage value and low threshold voltage value, according to comparative result, export input protection control voltage, particularly, described hysteresis comparator, if quantize voltage specifically for described first to be not less than described high threshold voltage value, export the input protection control voltage identical with the first predetermined threshold value; And if the first quantification voltage obtained is less than described low threshold voltage value, export the input protection control voltage identical with the second predetermined threshold value, if obtain first quantizes voltage between the high threshold voltage value and low threshold voltage value of setting, then the input protection control voltage of maintenance and previous output is constant;
Described temperature compensation unit, for sampling to temperature signal, exports the temperature signal that obtains of sampling, and after the sample temperature signal obtained and the comparative voltage initial value of presetting are carried out computing, exports temperature variant comparative voltage;
Described ALC unit, radio-frequency input signals for radio frequency power amplification device front end is sampled, and the performance number of the radio-frequency input signals obtained of sampling is converted to the second quantification voltage, and obtain the comparative voltage of described temperature compensation unit output, compare described second of acquisition based on integral operation and quantize voltage and comparative voltage, export ALC control voltage according to comparative result, wherein, described ALC unit, comprises the detecting circuit and integral operation circuit that are positioned at RF power amplifying device front end; The described detecting circuit being positioned at described RF power amplifying device front end, inputs to the radio-frequency input signals of described RF power amplifying device for being coupled, and the performance number conversion second of the radio-frequency input signals obtained of sampling is quantized voltage; Described integral operation circuit, for obtaining the comparative voltage that described temperature compensation unit exports, relatively obtain described second quantizes voltage and comparative voltage, if described second quantification voltage is less than described comparative voltage, described integral operation circuit exports the ALC control voltage of high level; If described second quantizes voltage be not less than described comparative voltage, the ALC control voltage of described integral operation circuit output low level;
Described AGC unit, for obtaining the temperature signal that temperature compensation unit exports, and after the temperature signal of acquisition and default AGC control voltage initial value are carried out computing, exports temperature variant AGC control voltage;
Described signal selecting circuit unit, after input protection control voltage for obtaining overturns, compare with the AGC control voltage obtained and ALC control voltage respectively, according to comparative result, the control signal that output low level voltage is corresponding controls the output control voltage of described rf attenuation circuit unit, wherein said signal selecting circuit unit, specifically for when described RF power amplifying device power output does not reach rated power, and be high level voltage after the input protection control voltage obtained is overturn, and the described ALC control voltage obtained is high level voltage, and the described AGC control voltage obtained is low level voltage, AGC control voltage is then selected to control the output control voltage of described rf attenuation circuit unit as control signal, and when described RF power amplifying device power output has reached rated power, and for the described AGC control voltage of high level voltage, acquisition is high level voltage after the input protection control voltage upset obtained, the described ALC control voltage obtained is low level voltage, then select ALC control voltage to control the output control voltage of described rf attenuation circuit unit as control signal, quantize voltage first identical with the high threshold voltage value of setting, when the input protection control voltage upset of described acquisition is for low level voltage, then select input protection control voltage to control the output control voltage of described rf attenuation circuit unit as control signal,
Described rf attenuation circuit unit, for the control signal exported according to the signal selecting circuit unit obtained, controls to decay to the radiofrequency signal of input, and the radiofrequency signal after decay is exported to RF power amplifying device.
2. radio frequency protector as claimed in claim 1, it is characterized in that, described temperature compensation unit, comprises temperature sensing circuit and signal processor;
Described temperature sensing circuit, for sampling to temperature signal;
Described signal processor, after carrying out computing, exports temperature variant comparative voltage for the temperature signal obtained sampling and the comparative voltage initial value preset.
3. radio frequency protector as claimed in claim 1; it is characterized in that; described AGC unit; comprise signal processor; for obtaining the temperature signal that temperature compensation unit exports; and after the temperature signal obtained and default AGC control voltage initial value are carried out computing, export temperature variant AGC control voltage.
4. radio frequency protector as claimed in claim 1; it is characterized in that; described radio frequency input protection unit; if when the input protection control voltage also for exporting being not less than the 3rd predetermined threshold value, producing indicative input and reaching the overpowering alarm signal of input to the radio-frequency input signals of rf attenuation circuit unit.
5. radio frequency protector as claimed in claim 4; it is characterized in that; described radio frequency input protection unit; also comprise signal processor; if when the input protection control voltage for hysteresis comparator output is not less than the 3rd predetermined threshold value, produces indicative input and reach the overpowering alarm signal of input to the radio-frequency input signals of rf attenuation circuit unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103888088B (en) * | 2014-03-20 | 2017-03-08 | 京信通信系统（广州）有限公司 | Power amplifier protection system based on ALC |
| CN104242835B (en) * | 2014-09-18 | 2017-08-18 | 天津七一二通信广播股份有限公司 | A kind of ultrashort wave radio set ALC control systems and method based on FPGA |
| CN104868858A (en) * | 2015-05-15 | 2015-08-26 | 四川龙瑞微电子有限公司 | Microwave power amplification device with adjustable attenuation amplitude |
| CN104868861A (en) * | 2015-05-15 | 2015-08-26 | 四川龙瑞微电子有限公司 | Microwave power amplifier with adjustable attenuation amplitude |
| CN105227144B (en) * | 2015-11-13 | 2018-07-13 | 中国电子科技集团公司第二十九研究所 | A kind of over-excitation protection circuit and its implementation of solid-state power amplifier |
| CN107046409B (en) * | 2017-05-23 | 2020-02-11 | 北京智芯微电子科技有限公司 | Wide-band large dynamic automatic gain control circuit for power carrier communication |
| CN107707208B (en) * | 2017-10-25 | 2021-09-24 | 京信网络系统股份有限公司 | Signal power control method and control circuit for communication system equipment |
| CN112039519B (en) * | 2020-08-12 | 2022-09-20 | 中国电子科技集团公司第四十一研究所 | Large-dynamic-range high-precision power control method for ultra-wideband millimeter wave signals |
| CN116155352B (en) * | 2023-01-14 | 2024-05-31 | 西安空间无线电技术研究所 | Satellite-borne power agility control circuit system and control method |
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Address after: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No. 10 Shenzhou Road, Guangzhou Science City, Guangdong Province Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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