CN103401516A - Radio frequency protector - Google Patents
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- CN103401516A CN103401516A CN2013103172128A CN201310317212A CN103401516A CN 103401516 A CN103401516 A CN 103401516A CN 2013103172128 A CN2013103172128 A CN 2013103172128A CN 201310317212 A CN201310317212 A CN 201310317212A CN 103401516 A CN103401516 A CN 103401516A
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Abstract
The invention discloses a radio frequency protector used for miniaturizing radio frequency power amplifiers. The radio frequency protector comprises a radio frequency input protection unit, an ALC (automatic level control) unit, a temperature compensation unit, an AGC (automatic gain control) unit and a signal selection circuit unit, wherein the radio frequency input protection unit, the ALC unit, the temperature compensation unit, the AGC unit and the signal selection circuit unit are integrally designed and electrically connected with a same radio frequency attenuator circuit unit. The signal selection circuit unit is used for turning input protection control voltage and comparing the voltage respectively to AGC control voltage and ALC control voltage, the low-level voltage is used as output control voltage for controlling the radio frequency attenuator unit.
Description
Technical field
The present invention relates to the mobile communication technology field, especially relate to a kind of radio frequency protective device.
Background technology
The radio-frequency power multiplying arrangement in mobile communications industry generally be used to increasing signal transmission power, the spread signal coverage.
Along with the development of mobile communication technology, the mobile communication technology of various standards is constantly perfect, and signal of communication is also more complicated.Generally; automatic electric-level to radio frequency power amplification device control and protection is controlled (English: Automatic Level Control; abbreviation: ALC) circuit, automatic gain are controlled (English: Automatic Gain Control, abbreviation: AGC) circuit, temperature compensation circuit, radio frequency input protection circuit employing Distributed Design.The for example large-signal input that can't evade of traditional design of alc circuit in the output feedback, this large-signal input that can't evade can't be left in the basket on the impact of radio frequency power amplification device, especially at high-power product and in coordinating the product design of linearization technique, power amplifying device has been operated near saturated or saturation condition, and over proof signal excitation meeting impacts the reliability of radio frequency power amplification device.And traditional simulation alc circuit, starting to control the degree of depth has certain thresholding, if surpass this, starts to control degree of depth threshold value, can cause beating of alc circuit level control thresholding, and then affect the reliability of radio-frequency power multiplying arrangement.Along with the addressing of mobile communication equipment is more difficult; need the radio frequency power amplification device is carried out to microminiaturized product design; the area that alc circuit, agc circuit, temperature compensation circuit, the radio frequency input protection circuit of traditional distributed design take is larger, therefore can't realize the microminiaturization of radio-frequency power multiplying arrangement.
In sum, the area that generally takies for alc circuit, agc circuit, temperature compensation circuit, the radio frequency input protection circuit of the Distributed Design of radio-frequency power multiplying arrangement control and protection is larger, can't realize the microminiaturization of radio-frequency power multiplying arrangement.
Summary of the invention
The embodiment of the present invention provides a kind of radio frequency protective device, and the area that takies is less, can realize preferably the microminiaturization of radio-frequency power multiplying arrangement.
A kind of radio frequency protective device, comprise radio frequency input protection unit, automatic electric-level control ALC unit, temperature compensation unit, automatic gain control AGC unit, signal selecting circuit unit and rf attenuation circuit unit, wherein: described radio frequency input protection unit, for the power to the radio-frequency input signals of radio frequency attenuator circuit unit front end, sample, and the performance number of the radio-frequency input signals that sampling is obtained is converted to first and quantizes voltage; And will obtain first quantize voltage respectively with the threshold voltage of setting relatively, and described threshold voltage comprises high threshold magnitude of voltage and low threshold magnitude of voltage, according to comparative result, voltage is controlled in the output input protection; Described temperature compensation unit, for temperature signal is sampled, the temperature signal that the output sampling obtains, and, after the temperature signal that sampling obtains is carried out to computing with default comparative voltage initial value, export temperature variant comparative voltage; Described ALC unit, for the radio-frequency input signals of radio frequency power amplification device front end is sampled, and the performance number of the radio-frequency input signals that sampling is obtained is converted to second and quantizes voltage, and the comparative voltage that obtains the output of described temperature compensation unit, based on described the second quantification voltage and comparative voltage that integral operation relatively obtains, ALC controls voltage according to comparative result output; Described AGC unit, be used to obtaining the temperature signal of temperature compensation unit output, and, after the temperature signal of acquisition and default AGC control Initial Voltage Value are carried out to computing, export temperature variant AGC and control voltage; Described signal selecting circuit unit, after for the input protection that will obtain, controlling the voltage upset, with the AGC control voltage and the ALC that obtain, control voltage ratio respectively, according to comparative result, the control signal that output low level voltage is corresponding is controlled the output of described rf attenuation circuit unit and is controlled voltage; Described rf attenuation circuit unit, for the control signal of the output of the signal selecting circuit unit according to obtaining, the radiofrequency signal of controlling input decays, and the radiofrequency signal after decaying is exported to the radio-frequency power multiplying arrangement.
by adopting technique scheme, the radio frequency protective device comprise integrated design and and the radio frequency input protection unit that is electrically connected of same rf attenuation circuit unit, the ALC unit, the temperature compensation unit, AGC unit and signal selecting circuit unit, due to radio frequency input protection unit, the ALC unit, the same rf attenuation circuit unit of AGC units shared, and in the input protection of radio frequency input protection unit output, control voltage by the signal selecting circuit unit, the AGC that the ALC of ALC unit output controls voltage and the output of AGC unit controls selection one road voltage turn-on in voltage, by other two-way voltage shield, thereby realize the control to radio frequency attenuator circuit unit, middle radio frequency input protection unit compared to existing technology, the ALC unit, the AGC unit needs the radio frequency protective device of three rf attenuation circuit units, avoided the area that takies due to the radio frequency protective device larger, realized preferably the microminiaturization of radio-frequency power multiplying arrangement.
The accompanying drawing explanation
Fig. 1 is in the embodiment of the present invention, and the protective device of the radio frequency based on the hysteresis comparator structure of proposition forms schematic diagram;
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 guard method of the radio frequency based on the hysteresis comparator flow chart of proposition.
Embodiment
alc circuit for the Distributed Design for radio-frequency power multiplying arrangement control and protection that exists in prior art, agc circuit, the temperature compensation circuit, the area that the radio frequency input protection circuit takies is larger, can't realize the problem of radio-frequency power multiplying arrangement microminiaturization, in the technical scheme that the embodiment of the present invention proposes, the radio frequency protective device comprise integrated design and and the radio frequency input protection unit that is electrically connected of same rf attenuation circuit unit, the ALC unit, the temperature compensation unit, AGC unit and signal selecting circuit unit, due to radio frequency input protection unit, the ALC unit, the same rf attenuation circuit unit of AGC units shared, and in the input protection of radio frequency input protection unit output, control voltage by the signal selecting circuit unit, the AGC that the ALC of ALC unit output controls voltage and the output of AGC unit controls selection one road voltage turn-on in voltage, by other two-way voltage shield, thereby realize the control to radio frequency attenuator circuit unit, middle radio frequency input protection unit compared to existing technology, the ALC unit, the AGC unit needs the radio frequency protective device of three rf attenuation circuit units, avoided the area that takies due to the radio frequency input protection circuit larger, realized preferably the microminiaturization of radio-frequency power multiplying arrangement.
Below in conjunction with each accompanying drawing, embodiment of the present invention technical scheme main realized to principle, embodiment and the beneficial effect that should be able to reach is at length set forth.
As shown in Figure 1; the embodiment of the present invention proposes a kind of radio frequency protective device; in the embodiment of the present invention and accompanying drawing 1; what provide is with front control ALC, AGC based on hysteresis comparator, the radio frequency protective device of temperature compensation integrated, comprises integrated design the 11,ALC unit, radio frequency input protection unit 14,13,AGC unit, temperature compensation unit 15 and the signal selecting circuit unit 16 that with same rf attenuation circuit unit 51, are electrically connected.
Wherein, in the technical scheme that the embodiment of the present invention proposes, the radio frequency protective device can be used as one independently equipment be positioned at radio-frequency power multiplying arrangement front end, also can be used as an integration module, as the part of radio-frequency power multiplying arrangement.Preferably, the embodiment of the present invention take the radio frequency protective device as one independently equipment be positioned at radio-frequency power multiplying arrangement front end and be described in detail as example.
Radio frequency input protection unit 11, sample to the power of the radio-frequency input signals of radio frequency attenuator circuit unit 51 front ends, and the performance number of the radio-frequency input signals that sampling is obtained is converted to first and quantizes voltage; And will obtain first quantize voltage respectively with the threshold voltage of setting relatively, and threshold voltage comprises high threshold magnitude of voltage and low threshold magnitude of voltage, according to comparative result, voltage is controlled in the output input protection.
Radio frequency input protection unit 11, comprise the detecting circuit 110 that is positioned at rf attenuation circuit unit 51 front ends, for coupling, inputs to the radio-frequency input signals of rf attenuation circuit unit 51.Power to the radio-frequency input signals of radio frequency attenuator circuit unit 51 front ends is sampled, and the performance number of the radio-frequency input signals that sampling is obtained is converted to first and quantizes voltage.
For ease of setting forth, the embodiment of the present invention quantizes voltage by first and adopts V1 to represent.Wherein, first of the performance number that radio frequency input protection unit 11 samples and output quantizes between voltage V1; has relation one to one; namely larger to the sample performance number that obtains of the power of the radio-frequency input signals of radio frequency attenuator circuit unit 51 front ends; corresponding conversion is the first higher quantification voltage; less to the sample performance number that obtains of the power of the radio-frequency input signals of radio frequency attenuator circuit unit 51 front ends, corresponding conversion is lower first to quantize voltage.
Radio frequency input protection unit 11 also comprises hysteresis comparator 12; the first quantification voltage that hysteresis comparator 12 obtains to be converted to; the the first quantification voltage that obtains is compared with the threshold voltage of setting respectively; and threshold voltage comprises high threshold magnitude of voltage and low threshold magnitude of voltage; according to comparative result, voltage is controlled in the output input protection.
Particularly, above-mentioned hysteresis comparator 12, be not less than the high threshold magnitude of voltage if specifically for first, quantize voltage, exports the input protection identical with the first predetermined threshold value and control voltage; And if the first quantification voltage that obtains is less than the low threshold magnitude of voltage; export the input protection identical with the second predetermined threshold value and control voltage; if it is constant that the first quantification voltage that obtains between the high threshold magnitude of voltage of setting and low threshold magnitude of voltage, keeps the input protection of last time output to control voltage.
Wherein, hysteresis comparator 12 obtains first and quantizes voltage V1; and carry out comparison operation; thereby obtain according to comparative result the voltage that two-way has identical magnitude of voltage; as shown in Figure 1; wherein a road voltage is controlled voltage V5 as input protection and is exported to signal selecting circuit unit 16, and another road voltage V2, can export to signal processor.The magnitude of voltage of V5 and V2 equates, and is just different for the function that realizes.
Radio frequency input protection unit 11, if, while also for the input protection control voltage of exporting, being not less than the 3rd predetermined threshold value, producing and indicate the radio-frequency input signals that inputs to the rf attenuation circuit unit to reach the overpowering alarm signal of input.Wherein, the 3rd predetermined threshold value can equate with above-mentioned the first predetermined threshold value.Particularly; when the first quantification voltage is not less than default high threshold magnitude of voltage; voltage is controlled in the input protection that hysteresis comparator 12 outputs and the first predetermined threshold value equate; it is the high level voltage value that voltage is controlled in this input protection; hysteresis comparator 12 is exported altogether the input protection that two-way is identical and is controlled voltage; wherein a road input protection is controlled voltage V5 and is exported to signal selecting circuit unit 16; an other road input protection is controlled voltage V2 and is exported 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 for the input protection of hysteresis comparator 12 output, controlling voltage V2 and be not less than the 3rd predetermined threshold value, produce the radio-frequency input signals that indication inputs to rf attenuation circuit unit 51 and reach the overpowering alarm signal of input.
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 outputs adopts V1 to represent, supposes that the high threshold magnitude of voltage of setting adopts U
IHExpression, the low threshold magnitude of voltage of setting adopts U
ILExpression, the high threshold magnitude of voltage U of setting
IHGreater than the low threshold magnitude of voltage U that sets
IL.
As shown in Figure 2, if obtain first quantize voltage V1 more than or equal to the high threshold magnitude of voltage U that sets
IH, voltage is controlled in the input protection identical with the first predetermined threshold value that the output two-way equates, and the first predetermined threshold value adopts Uomax to represent.V1>=U even
IHThe time, the two-way magnitude of voltage V2=V5=Vout=Uomax=high level voltage of hysteresis comparator 12 outputs.
If the first quantification voltage V1 that obtains is less than the low threshold magnitude of voltage U that sets
IL, voltage is controlled in the input protection identical with the second predetermined threshold value that the output two-way equates, and the second predetermined threshold value adopts Uomin to represent, can be 0.V1<U even
ILThe time, the two-way magnitude of voltage V2=V5=Vout=Uomin=0=low level voltage of hysteresis comparator 12 outputs.
If the first quantification voltage V1 that obtains is more than or equal to the low threshold magnitude of voltage U that sets
IL, simultaneously less than the high threshold magnitude of voltage U that sets
IHThe time, export the input protection that two-way is identical with the magnitude of voltage of last time output and control voltage.Namely in this kind situation, U
IL≤ V1<U
IHThe time, if voltage is controlled in the input protection of last hysteresis comparator 12 outputs, be Uomax, the two-way voltage of this output is still V2=V5=Vout=Uomax.Similarly, if voltage is controlled in the input protection of last hysteresis comparator 12 outputs, be Uomin, the two-way voltage of this output is still V2=V5=Vout=Uomin=0.
The radio-frequency (RF) input power of 11 pairs of radio frequency attenuator circuit unit 51 front ends of radio frequency input protection circuit is sampled, and the performance number that will sample one by one corresponding conversion be first to quantize to export hysteresis comparator 12 to after voltage.After hysteresis comparator 12 acquisitions first quantize voltage, the first quantification voltage that obtains is compared with the high threshold magnitude of voltage of setting and low threshold magnitude of voltage respectively, according to the different control voltage of comparative result output.Continuous increase along with 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 magnitude of voltage of setting; the voltage signal of hysteresis comparator 12 output high level; this voltage signal entering signal is selected to be converted to low level voltage signal after circuit; playing a leading role and controlling the rf attenuation circuit unit is the maximum attenuation value, realizes defencive function report and alarm.Radio-frequency power value reduction when input; while for example from the alarming threshold of setting, reducing; when the first quantification voltage is between the high threshold magnitude of voltage of setting and low threshold magnitude of voltage; hysteresis comparator 12 is remained the constant voltage signal of output of last time, and the radio-frequency power multiplying arrangement still is in guard mode.When the radiofrequency signal of inputting further reduces, the first corresponding quantification voltage also can reduce, and when the first quantification voltage was decreased to the low threshold magnitude of voltage of setting, the output voltage of hysteresis comparator overturn, alarm protection recovery.Therefore, the introducing of hysteresis comparator, while avoiding input power near setting threshold value, alarm clearing switching frequently, affect user's experience and the safety of equipment.
Wherein, the temperature compensation unit comprises temperature sensing circuit 131 and signal processor 132.131 pairs of temperature detection signal samplings of temperature sensing circuit, signal processor 132 are exported temperature variant comparative voltage after for the temperature signal that temperature sensing circuit 131 samplings are obtained, with default comparative voltage initial value, carrying out computing.Comparative voltage is exported to ALC unit 14.For ease of setting forth, as shown in Figure 1, adopt V4 to represent the comparative voltage of temperature compensation unit 13 outputs.
In the radio frequency protective device that the embodiment of the present invention proposes, signal processor 132, serve whole radio frequency protective device.For example signal processor 132 can pass through analog/digital (A/D) sampling, the voltage V2 of hysteresis comparator 12 outputs is converted into to digital quantity, then with the alarming threshold that sets, compare, need to judge whether the alarm of reporting radio frequency power amplification device input overpower.And for example, signal processor 132 is served temperature compensation unit 13, and temperature sensing circuit 131 is electrically connected.Signal processor 132 is controlled temperature sensing circuit 131; temperature detection signal is carried out to the A/D sampling; and through digital-to-analog (D/A) conversion; the voltage signal of the temperature variant comprehensive function relation of output two-way; signal processor 132 is also served the AGC unit; for exporting AGC, control voltage, and signal processor 132 also serves radio frequency input protection unit, for the outputting alarm signal.V7 as shown in Figure 1 and V4, wherein a road voltage signal is controlled voltage V7 as AGC and is exported to signal selecting circuit unit 16, and other road voltage signal voltage V4 is as a comparison exported to ALC unit 14.
Particularly, be positioned at the detecting circuit 141 of radio-frequency power multiplying arrangement 52 front ends, coupling inputs to the radio-frequency input signals of radio-frequency power multiplying arrangement 52 front ends, and the performance number that will be coupled to is converted to the second quantification voltage, for ease of setting forth, second quantizes voltage adopts V3 to represent.In second of performance number that the detecting circuit 141 of radio-frequency power multiplying arrangement 52 front ends samples and output, quantize to have relation one to one between voltage V3, namely be positioned at the large corresponding conversion of performance number that the detecting circuit 141 of radio-frequency power multiplying arrangement 52 front ends samples and quantize voltage for higher second, be positioned at that performance number that the detecting circuit 141 of radio-frequency power multiplying arrangement 52 front ends samples is less correspondingly to be converted into lower second and to quantize voltage.
Wherein, integral operation circuit 142, obtain the comparative voltage V4 of temperature compensation unit 13 outputs, the second quantification voltage V3 and the comparative voltage V4 that relatively obtains, if second quantizes voltage V3 less than comparative voltage V4, the ALC of integral operation circuit 142 output high level controls voltage, and for ease of setting forth, ALC controls voltage and adopts V6 to represent; If second quantizes voltage V3 more than or equal to comparative voltage V4, the ALC of integral operation circuit 142 output low levels controls voltage V6.Namely before radio-frequency power multiplying arrangement 52 does not reach rated power output, second quantizes voltage V3<comparative voltage V4, the ALC of integral operation circuit 142 outputs controls voltage V6 and continues to remain on high level state, increase along with radio-frequency power multiplying arrangement 52 input signals, as the second quantification voltage V3 >=comparative voltage V4, the output of integral operation circuit 142 is overturn, and it is low level voltage that the ALC of output controls voltage V6.
In the technical scheme that the embodiment of the present invention proposes, the radio-frequency power of the 14 pairs of input radio frequency power amplification devices 52 in ALC unit is sampled, and can avoid preferably high-power signal to enter the radio-frequency power multiplying arrangement affects its reliability.
Not shown in AGC unit 15(Fig. 1), obtain the temperature signal of temperature compensation unit 13 outputs, and after the temperature signal that will obtain and default AGC control Initial Voltage Value and carry out computing, export temperature variant AGC and control voltage, and the AGC that will obtain controls Voltage-output to signal selecting circuit unit 16.The AGC unit comprises signal processor 132, be used to obtaining the temperature signal of temperature compensation unit 13 output, and, after the temperature signal that will obtain and default AGC control Initial Voltage Value and carry out computing, export temperature variant AGC control voltage.
From the above, as AGC, control the voltage signal V7 of voltage, and to export the comparative voltage V4 that makes comparisons the ALC unit to be the voltage signal of temperature variant comprehensive function relation, thereby realize that ALC controls, AGC controls and the integrated design of temperature-compensating.Because the control voltage of ,AGC unit, ,ALC unit, radio frequency input protection unit shares a rf attenuation circuit by signal selecting circuit; thereby realize ALC, AGC, temperature compensation circuit, the integrated design of radio frequency input protection circuit, realize controlling the miniaturization of protection.Due to alc circuit, from the coupling of equipment input link, with the circuit of output coupling, compare, avoided high-power signal by the radio-frequency power multiplying arrangement, to damage the risk of power amplifying device wherein.
Signal selecting circuit unit 16; after the input protection that obtains is controlled to the voltage upset, with the AGC control voltage and the ALC that obtain, control voltage ratio respectively, according to comparative result; export the control signal corresponding with low level voltage, control the output of rf attenuation circuit unit 51 and control voltage.
Rf attenuation circuit unit 51, be used to the radiofrequency signal that obtains to input, according to the control signal of signal selecting circuit unit 16 outputs that obtain, control described radio frequency signal attenuation, and the radiofrequency signal after decaying is exported to radio-frequency power multiplying arrangement 52.
Wherein signal selecting circuit unit 16 can comprise in signal selecting circuit 161(Fig. 1 not shown), for when radio-frequency power multiplying arrangement power output does not reach rated power, and the ALC control voltage for high level voltage and acquisition after the upset of the input protection of acquisition control voltage is high level voltage, when the AGC control voltage that obtains is low level voltage, selects AGC to control voltage and control voltage as the output of controlling rf attenuation circuit unit 51; And when radio-frequency power multiplying arrangement 52 power outputs have reached rated power, and it is high level voltage that the rear AGC for high level voltage, acquisition of the input protection that obtains control voltage upset controls voltage, it is low level voltage that the ALC that obtains controls voltage, selects ALC to control voltage and controls voltage as the output of controlling rf attenuation circuit unit 51; High threshold magnitude of voltage in the first quantification voltage and setting is identical, when the voltage upset is controlled in the input protection of acquisition for low level, selects input protection to control voltage and controls voltage as the output of control rf attenuation circuit unit 51.
It should be noted that; high level voltage and low level voltage that above-mentioned signal selecting circuit unit obtains; refer to that voltage is controlled in the input protection that the signal selecting circuit unit obtains, AGC controls voltage and ALC controls voltage; maximum or minimum in three voltage; the high level voltage value can be 5V, 15V, 30V etc.; the low level voltage value can be 0V, can be 1V etc.High level voltage and low level voltage are comparatively speaking, do not have strict regulation.
particularly, voltage V5 is controlled in input protection, AGC controls voltage V7, ALC controls the equal input signal of voltage V6 and selects circuit unit 16, signal selecting circuit unit 16 is by drawing on triode and voltage, input protection is controlled to voltage V5 and produce upset, output characteristic according to hysteresis comparator, directly export high level or low level 0V, voltage after corresponding upset is low level 0V or high level, and judge by the characteristic of diode forward conduction, by the voltage after V5 upset respectively with V6, V7 compares, select low level wherein straight-through, and by other two-way voltage shield.
Increase along with radio-frequency input signals; when radio-frequency power multiplying arrangement 52 power outputs do not arrive rated power; after input protection control voltage V5 upset, for high level, ALC control voltage V6, be that high level, AGC control voltage V7 are low level relatively; it is straight-through that AGC is optionally controlled voltage V7 in signal selecting circuit unit 16; its decay of control voltage control as rf attenuation circuit unit 51; simultaneously input protection is controlled to voltage V5, ALC and controlled voltage V6 shielding; guarantee that radio-frequency power multiplying arrangement link gain is stable, realize the function of AGC.When radio-frequency power multiplying arrangement 52 power outputs reach rated power; ALC controls voltage V6Wei tri-tunnels and controls minimum voltage in voltage; it is straight-through that ALC is optionally controlled voltage V6 in signal selecting circuit unit 16; its decay of control voltage control as the rf attenuation circuit unit; input protection is controlled voltage V5, AGC and is controlled voltage V7 shielding; assurance radio-frequency power multiplying arrangement 52 stable output powers, at the rated power state, are realized the ALC function.When the shutter that increases to setting of radio-frequency input signals is prescribed a time limit; input protection is low level 0V after controlling voltage V5 upset; it is straight-through that input protection is optionally controlled voltage V5 in signal selecting circuit unit 16; it decays to maximum as the control voltage control of rf attenuation circuit unit; ALC controls voltage V6, AGC and controls voltage V7 shielding; and compare report and alarm in signal processor 132, and guarantee radio-frequency power multiplying arrangement safety, realize radio frequency input protection function.By suitable parameter designing; the input protection thresholding is arranged on after the radio-frequency power multiplying arrangement starts to control; alc circuit starts to control in stability range; make to cause that the unsettled radiofrequency signal of starting to control of alc circuit level control can not input to the radio-frequency power multiplying arrangement, guarantee radio-frequency power multiplying arrangement safety.
In the technical scheme of the above-mentioned proposition of the present invention, during ,AGC unit, ALC unit, temperature compensation unit, radio frequency input protection circuit unit integral are established, increase along with radio-frequency input signals, when radio-frequency power multiplying arrangement power output does not arrive rated power, it is straight-through that signal selecting circuit is optionally controlled AGC voltage, its decay of control voltage control as the rf attenuation circuit, voltage is controlled in input protection, ALC controls voltage shield, guarantee that radio-frequency power multiplying arrangement link gain is stable, realize the AGC function; When radio-frequency power multiplying arrangement power output reaches rated power, it is straight-through that signal selecting circuit is optionally controlled ALC voltage, its decay of control voltage control as the rf attenuation circuit, voltage is controlled in input protection, AGC controls voltage shield, assurance radio-frequency power multiplying arrangement stable output power, at the rated power state, is realized the ALC function; When the shutter that increases to setting of radio-frequency input signals is prescribed a time limit; it is straight-through that signal selecting circuit is optionally controlled input protection voltage; it decays to maximum as the control voltage control of rf attenuation circuit; voltage is controlled in input protection, ALC controls voltage shield; and in signal processor, compare report and alarm; guarantee radio-frequency power multiplying arrangement safety, realize radio frequency input protection function.By suitable parameter designing; the input protection thresholding is arranged on after the radio-frequency power multiplying arrangement starts to control; alc circuit starts to control in stability range; make to cause that the unsettled radiofrequency signal of deeply starting to control of alc circuit level control can not input to the radio-frequency power multiplying arrangement, guarantee radio-frequency power multiplying arrangement safety.
The radio frequency protective device that the embodiment of the present invention proposes; ,AGC unit, ALC unit, the temperature compensation unit that comprises the temperature compensation circuit, the radio frequency input protection unit that comprises the radio frequency input protection circuit are carried out to integrated design, and be no longer Distributed Design of the prior art.
Correspondingly; the embodiment of the present invention also proposes a kind of method that realizes the radio frequency protection based on above-mentioned radio frequency protective device; comprise integrated design the radio frequency input protection unit that is electrically connected with same rf attenuation circuit unit, automatic electric-level control ALC unit, temperature compensation unit, automatic gain control AGC unit and signal selecting circuit unit; as shown in Figure 3, its concrete handling process such as following:
wherein, it is that the first quantification voltage that radio frequency input protection unit will obtain obtains more afterwards with the threshold voltage of setting respectively that voltage is controlled in input protection, the first to quantize voltage be radio frequency input protection unit sampling to the radio-frequency input signals of radio frequency attenuator circuit unit front end, and obtain after the conversion of the performance number of the radio-frequency input signals that sampling is obtained, it is that temperature signal is sampled that AGC controls voltage, and the input protection of the described radio frequency input protection unit of the temperature signal that sampling is obtained and acquisition output is controlled voltage and is carried out the voltage of exporting after computing, ALC control voltage be the ALC unit will input to after the radio-frequency input signals sampling of radio-frequency power multiplying arrangement front end obtain second quantize voltage and sample to temperature signal in described temperature compensation unit, and the input protection of the described radio frequency input protection unit of the temperature signal that sampling is obtained and acquisition output is controlled voltage and is carried out the voltage that the comparative voltage of exporting after computing obtains more afterwards based on integral operation.
When radio-frequency power multiplying arrangement power output does not reach rated power; and be high level voltage by the ALC control voltage for high level voltage and acquisition after the upset of the input protection of acquisition control voltage; it is low level voltage that the AGC that obtains controls voltage, selects AGC to control voltage and as control signal, controls the output control voltage of described rf attenuation circuit unit.When radio-frequency power multiplying arrangement power output has reached rated power; and it is high level voltage that the rear AGC for high level voltage, acquisition of the input protection that obtains control voltage upset controls voltage; it is low level voltage that the ALC that obtains controls voltage, selects ALC to control voltage and as control signal, controls the output control voltage of described rf attenuation circuit unit.High threshold magnitude of voltage in the first quantification voltage and setting is identical, when the voltage upset is controlled in the input protection of acquisition for low level voltage, selects input protection to control voltage and controls voltage as the output of control signal control rf attenuation circuit unit.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. radio frequency protective device; it is characterized in that; described radio frequency protective device comprises radio frequency input protection unit, automatic electric-level control ALC unit, temperature compensation unit, automatic gain control AGC unit, signal selecting circuit unit and rf attenuation circuit unit, wherein:
Described radio frequency input protection unit, sample for the power of the radio-frequency input signals to radio frequency attenuator circuit unit front end, and the performance number of the radio-frequency input signals that sampling is obtained is converted to first and quantizes voltage; And will obtain first quantize voltage respectively with the threshold voltage of setting relatively, and described threshold voltage comprises high threshold magnitude of voltage and low threshold magnitude of voltage, according to comparative result, voltage is controlled in the output input protection;
Described temperature compensation unit, for temperature signal is sampled, the temperature signal that the output sampling obtains, and, after the temperature signal that sampling obtains is carried out to computing with default comparative voltage initial value, export temperature variant comparative voltage;
Described ALC unit, for the radio-frequency input signals of radio frequency power amplification device front end is sampled, and the performance number of the radio-frequency input signals that sampling is obtained is converted to second and quantizes voltage, and the comparative voltage that obtains the output of described temperature compensation unit, based on described the second quantification voltage and comparative voltage that integral operation relatively obtains, ALC controls voltage according to comparative result output;
Described AGC unit, be used to obtaining the temperature signal of temperature compensation unit output, and, after the temperature signal of acquisition and default AGC control Initial Voltage Value are carried out to computing, export temperature variant AGC and control voltage;
Described signal selecting circuit unit, after for the input protection that will obtain, controlling the voltage upset, with the AGC control voltage and the ALC that obtain, control voltage ratio respectively, according to comparative result, the control signal that output low level voltage is corresponding is controlled the output of described rf attenuation circuit unit and is controlled voltage;
Described rf attenuation circuit unit, for the control signal of the output of the signal selecting circuit unit according to obtaining, the radiofrequency signal of controlling input decays, and the radiofrequency signal after decaying is exported to the radio-frequency power multiplying arrangement.
2. radio frequency protective device as claimed in claim 1, is characterized in that, described radio frequency input protection unit comprises the detecting circuit that is positioned at rf attenuation circuit unit front end, and hysteresis comparator;
The described detecting circuit that is positioned at rf attenuation circuit unit front end, input to the radio-frequency input signals of rf attenuation circuit unit for coupling, and the performance number of the radio-frequency input signals that sampling is obtained is converted to first and quantizes voltage;
Described hysteresis comparator, for will obtain first quantize voltage respectively with the threshold voltage of setting relatively, and described threshold voltage comprises high threshold magnitude of voltage and low threshold magnitude of voltage, according to comparative result, voltage is controlled in the output input protection.
3. radio frequency protective device as claimed in claim 2, is characterized in that, described hysteresis comparator is not less than described high threshold magnitude of voltage if specifically for described first, quantize voltage, exports the input protection identical with the first predetermined threshold value and controls voltage; And if the first quantification voltage that obtains is less than described low threshold magnitude of voltage; export the input protection identical with the second predetermined threshold value and control voltage; if the first quantification voltage that obtains, between the high threshold magnitude of voltage of setting and low threshold magnitude of voltage, keeps and the input protection control voltage of last time output is constant.
4. radio frequency protective device as claimed in claim 1, is characterized in that, described temperature compensation unit, comprise temperature sensing circuit and signal processor;
Described temperature sensing circuit, for sampling to temperature signal;
Described signal processor, after for temperature signal and the default comparative voltage initial value that sampling is obtained, carrying out computing, export temperature variant comparative voltage.
5. radio frequency protective device as claimed in claim 1, is characterized in that, described ALC unit comprises the detecting circuit and the integral operation circuit that are positioned at radio-frequency power multiplying arrangement front end;
The described detecting circuit that is positioned at described radio-frequency power multiplying arrangement front end, input to the radio-frequency input signals of described radio-frequency power multiplying arrangement for coupling, and the performance number conversion second of the radio-frequency input signals that sampling is obtained quantizes voltage;
Described integral operation circuit, for obtaining the comparative voltage of described temperature compensation unit output, relatively described second of acquisition quantizes voltage and comparative voltage, if described second quantizes voltage less than described comparative voltage, the ALC control voltage of described integral operation circuit output high level; If described second quantizes voltage, be not less than described comparative voltage, the ALC of described integral operation circuit output low level controls voltage.
6. radio frequency protective device as claimed in claim 1; it is characterized in that; described AGC unit; comprise signal processor; for obtaining the temperature signal of temperature compensation unit output; and, after the temperature signal that will obtain and default AGC control Initial Voltage Value and carry out computing, export temperature variant AGC control voltage.
7. described radio frequency protective device as arbitrary as claim 1～6, it is characterized in that, described signal selecting circuit unit, specifically for when described radio-frequency power multiplying arrangement power output does not reach rated power, and be high level voltage by the described ALC control voltage for high level voltage and acquisition after the upset of the input protection of acquisition control voltage, and it is low level voltage that the described AGC that obtains controls voltage, selects AGC to control voltage and as control signal, controls the output control voltage of described rf attenuation circuit unit; And when described radio-frequency power multiplying arrangement power output has reached rated power, and it is high level voltage that the rear described AGC for high level voltage, acquisition of the input protection that obtains control voltage upset controls voltage, it is low level voltage that the described ALC that obtains controls voltage, selects ALC to control voltage and as control signal, controls the output control voltage of described rf attenuation circuit unit; High threshold magnitude of voltage in the first quantification voltage and setting is identical, when the voltage upset is controlled in the input protection of described acquisition for low level voltage, selects input protection to control voltage and controls voltage as the output of the described rf attenuation circuit unit of control signal control.
8. radio frequency protective device as claimed in claim 1; it is characterized in that; described radio frequency input protection unit; if, while also for the input protection control voltage of exporting, being not less than the 3rd predetermined threshold value, producing and indicate the radio-frequency input signals that inputs to the rf attenuation circuit unit to reach the overpowering alarm signal of input.
9. radio frequency protective device as claimed in claim 8; it is characterized in that; described radio frequency input protection unit; also comprise signal processor; if when for the input protection of hysteresis comparator output, controlling voltage and be not less than the 3rd predetermined threshold value, produce the radio-frequency input signals that indication inputs to the rf attenuation circuit unit and reach the overpowering alarm signal of input.
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| CN103888088A (en) * | 2014-03-20 | 2014-06-25 | 京信通信系统（广州）有限公司 | Power amplifier protection system based on ALC |
| CN104242835A (en) * | 2014-09-18 | 2014-12-24 | 天津七一二通信广播有限公司 | FPGA (field programmable gate array)-based ALC (automatic level control) system and method for ultra-short wave radio set |
| 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 |
| CN105227144A (en) * | 2015-11-13 | 2016-01-06 | 中国电子科技集团公司第二十九研究所 | A kind of over-excitation protection circuit of solid-state power amplifier and its implementation |
| CN107046409A (en) * | 2017-05-23 | 2017-08-15 | 北京智芯微电子科技有限公司 | A kind of wideband Larger Dynamic automatic gain control circuit of power line carrier, PLC |
| CN107707208A (en) * | 2017-10-25 | 2018-02-16 | 京信通信系统（中国）有限公司 | The signal power control method and control circuit of communication system equipment |
| CN112039519A (en) * | 2020-08-12 | 2020-12-04 | 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 |
| CN116155352A (en) * | 2023-01-14 | 2023-05-23 | 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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| CN103888088A (en) * | 2014-03-20 | 2014-06-25 | 京信通信系统（广州）有限公司 | Power amplifier protection system based on ALC |
| 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 |
| CN104242835A (en) * | 2014-09-18 | 2014-12-24 | 天津七一二通信广播有限公司 | FPGA (field programmable gate array)-based ALC (automatic level control) system and method for ultra-short wave radio set |
| 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 |
| CN105227144A (en) * | 2015-11-13 | 2016-01-06 | 中国电子科技集团公司第二十九研究所 | A kind of over-excitation protection circuit of solid-state power amplifier and its implementation |
| CN107046409A (en) * | 2017-05-23 | 2017-08-15 | 北京智芯微电子科技有限公司 | A kind of wideband Larger Dynamic automatic gain control circuit of power line carrier, PLC |
| 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 |
| CN107707208A (en) * | 2017-10-25 | 2018-02-16 | 京信通信系统（中国）有限公司 | The signal power control method and control circuit of communication system equipment |
| CN112039519A (en) * | 2020-08-12 | 2020-12-04 | 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 |
| CN116155352A (en) * | 2023-01-14 | 2023-05-23 | 西安空间无线电技术研究所 | Satellite-borne power agility control circuit system and control method |
| 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 System (China) Ltd. |