CN106505959A - A kind of digital microwave systems high-gain radio-frequency channel AGC control loops - Google Patents
A kind of digital microwave systems high-gain radio-frequency channel AGC control loops Download PDFInfo
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- CN106505959A CN106505959A CN201610907710.1A CN201610907710A CN106505959A CN 106505959 A CN106505959 A CN 106505959A CN 201610907710 A CN201610907710 A CN 201610907710A CN 106505959 A CN106505959 A CN 106505959A
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- adjustment device
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 11
- 238000004891 communication Methods 0.000 description 5
- 125000002950 monocyclic group Chemical group 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
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- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The present invention provides a kind of digital microwave systems high-gain radio-frequency channel AGC control loops, including the second gain adjustment device to prime intermediate frequency amplification module gain-adjusted, the first gain adjustment device to rear class intermediate frequency amplification module gain-adjusted, intermediate frequency output acquisition module, intermediate frequency power output detection module and AGC loop control module；AGC loop control module is used for：When intermediate frequency output voltage is more than critical point, keep the second gain adjustment device gain maximum, the gain for controlling the first gain adjustment device reduces with the reduction of output voltage；When intermediate frequency output voltage is less than critical point, keep the first gain adjustment device gain minimum, the gain for controlling the second gain adjustment device reduces with the reduction of output voltage.The present invention is amplified by arranging two-stage intermediate frequency, and carries out Discrete control, so as to make power output keep constant power rating on a large scale in the case of input power.
Description
Technical field
The present invention relates to a kind of automatic growth control of digital microwave systems high-gain radio-frequency channel, and in particular to a kind of number
Word microwave system high-gain radio-frequency channel AGC control loops.
Background technology
At present development communication technologies are rapid, there is communication in wireless communications, and digital microwave telecommunication is used as one
Plant point-to-point communication mode and solve the problems, such as communication system " last one kilometer ", the outdoor unit system in digital microwave
(ODU) be digital microwave systems core, the important composition portion that ODU communicates as point-to-point (point to point)
Point, can be used for the transmission of various telecommunication services, such as phone, telegram, data, fax and color TV etc. can pass through microwave
Circuit transmission.Adapt to the trend of transmission network IPization, can be used to base station passback, broadband wireless access etc..
In ODU systems receiving channel require wide range of power input high-gain passage, it is desirable to receiving power -90dBm to -
20dBm stably exports -10dBm power when being input into, channel gain requires 80dB.Input range is from small-signal to the process of big signal
In require stable output power, this is accomplished by designing the high-gain radio-frequency channel that a kind of AGC control loops change in input power
Middle holding power output is in constant power rating.
Content of the invention
The technical problem to be solved in the present invention is：A kind of digital microwave systems high-gain radio-frequency channel AGC control rings are provided
Road, can realize firm power output in the case of input power on a large scale in high-gain radio-frequency channel.
The present invention for the solution technical scheme taken of above-mentioned technical problem is：A kind of digital microwave systems high-gain radio frequency
Passage AGC control loops, it is characterised in that：It includes that the second gain-adjusted to prime intermediate frequency amplification module gain-adjusted is filled
Put, the first gain adjustment device to rear class intermediate frequency amplification module gain-adjusted, intermediate frequency export acquisition module, intermediate frequency power output
Detection module and AGC loop control module；Wherein, the intermediate frequency output voltage of intermediate frequency output acquisition module collection, is exported by intermediate frequency
After power detection module carries out detection, algorithm process is carried out through AGC loop control module, then control the second gain-adjusted respectively
Device and the first gain adjustment device；
Corresponding intermediate frequency when the gain of minimum and the second gain adjustment device is maximum by the gain of the first gain adjustment device
Output voltage is used for realizing following logic as critical point, described algorithm process：When intermediate frequency output voltage is more than critical point, then
Keep the gain of the second gain adjustment device maximum, the gain of the first gain adjustment device of control subtracts with the reduction of output voltage
Little；When intermediate frequency output voltage is less than critical point, then keeps the gain of the first gain adjustment device minimum, control the second gain-adjusted
The gain of device reduces with the reduction of output voltage；
After described prime intermediate frequency amplification module is arranged on the once mixing of high-gain radio-frequency channel；In described rear class
After frequency amplification module is arranged on the secondary mixing of high-gain radio-frequency channel；Described intermediate frequency output voltage is logical for high-gain radio frequency
The intermediate frequency output voltage in road.
Such scheme is pressed, described AGC loop control module includes drive amplification circuit, the reverse integral electricity being sequentially connected
Road, amplitude limiter circuit, subtraction circuit and add circuit, the voltage that detection goes out carry out reverse integral, amplitude limit after drive amplification, so
Described logic is realized with add circuit by subtraction circuit afterwards.
Press such scheme, the input of described reverse integral circuit is connected with for arranging starting to control for AGC start-up operations
First threshold circuit of point；Described subtraction circuit input is connected with the second threshold circuit of the critical point for arranging described.
Such scheme is pressed, described AGC loop control module includes being respectively used to control the first gain adjustment device and
The first control circuit and second control circuit of two gain adjustment devices；Wherein first control circuit includes first for being sequentially connected
Drive amplification circuit, the first reverse integral circuit and the first amplitude limiter circuit, second control circuit include the second drive being sequentially connected
Dynamic amplifying circuit, negater circuit, the second reverse integral circuit and the second amplitude limiter circuit；
The voltage that detection goes out is exported respectively to the first drive amplification circuit and the second drive amplification circuit.
Press such scheme, the input of the first described reverse integral circuit is connected with for arranging AGC start-up operations
Start to control the first threshold circuit a little；The input of the second described reverse integral circuit is connected with and arranges the of described critical point
Two threshold circuits.
Beneficial effects of the present invention are：
1st, the present invention passes through to arrange two-stage intermediate frequency in high-gain radio-frequency channel and amplifies, and arrange certain logic to this two
Level intermediate frequency amplifies carries out Discrete control, so as to make power output keep constant power shape on a large scale in the case of input power
State.
2nd, by monocyclic control loop, detection voltage out only with the gain of the whole passage of loop Discrete control,
Discrete control enables the gain-adjusted in the passage of high-gain Larger Dynamic scope to realize very well；Additionally by reasonably setting
Put each thresholding so that whole loop and radio-frequency channel are operated in a suitable scope, can make Discrete control mode
Linking can allow the gain-adjusted of passage to work in the range of linearity of respective devices again very well, and the device in control passage is in its line
Property interval in work so as to not affecting channel performance index.
3rd, by double -loop control loop, the voltage that detection goes out point two-way controls the amplification of two-stage intermediate frequency respectively, additionally by conjunction
The setting of reason each thresholding so that whole loop and radio-frequency channel are operated in a suitable scope, can make segmentation control
Linking can allow the gain-adjusted of passage to work in the range of linearity of respective devices to mode processed again very well, the device in control passage
Work in its linearly interval so as to not affecting channel performance index.
Description of the drawings
Integral frame block diagrams of the Fig. 1 for one embodiment of the invention.
Monocyclic control loop block diagrams of the Fig. 2 for one embodiment of the invention.
Double -loop control loop block diagrams of the Fig. 3 for one embodiment of the invention.
Intermediate frequency power output detection module circuit theory diagrams of the Fig. 4 for one embodiment of the invention.
Fig. 5 is the reverse integral circuit theory diagrams in the monocyclic control loop of one embodiment of the invention.
Fig. 6 is the subtraction circuit and add circuit schematic diagram in the monocyclic control loop of one embodiment of the invention.
Fig. 7 is first control circuit schematic diagram in the double -loop control loop of one embodiment of the invention.
Fig. 8 is second control circuit schematic diagram in the double -loop control loop of one embodiment of the invention.
Specific embodiment
With reference to instantiation and accompanying drawing, the invention will be further described.
Integral frame block diagrams of the Fig. 1 for one embodiment of the invention, a kind of digital microwave systems high-gain radio-frequency channel AGC controls
Loop processed, it includes the second gain adjustment device to prime intermediate frequency amplification module gain-adjusted, to rear class intermediate frequency amplification module
First gain adjustment device of gain-adjusted, intermediate frequency output acquisition module, intermediate frequency power output detection module and AGC loop control
Module；Wherein, the intermediate frequency output voltage of intermediate frequency output acquisition module collection, carries out detection by intermediate frequency power output detection module
Afterwards, algorithm process is carried out through AGC loop control module, then control the second gain adjustment device and the first gain-adjusted dress respectively
Put；
Corresponding intermediate frequency when the gain of minimum and the second gain adjustment device is maximum by the gain of the first gain adjustment device
Output voltage is used for realizing following logic as critical point, described algorithm process：When intermediate frequency output voltage is more than critical point, then
Keep the gain of the second gain adjustment device maximum, the gain of the first gain adjustment device of control subtracts with the reduction of output voltage
Little；When intermediate frequency output voltage is less than critical point, then keeps the gain of the first gain adjustment device minimum, control the second gain-adjusted
The gain of device reduces with the reduction of output voltage；
After described prime intermediate frequency amplification module is arranged on the once mixing of high-gain radio-frequency channel；In described rear class
After frequency amplification module is arranged on the secondary mixing of high-gain radio-frequency channel；Described intermediate frequency output voltage is logical for high-gain radio frequency
The intermediate frequency output voltage in road.In the present embodiment, high-gain radio-frequency channel include radio frequency input amplification module, frequency mixing module,
Prime intermediate frequency amplification module (i.e. the second intermediate frequency), secondary mixing module, rear class intermediate frequency amplification module (i.e. the first intermediate frequency) and intermediate frequency
Output.
Embodiment one：
As shown in Fig. 2 described AGC loop control module includes drive amplification circuit, the reverse integral electricity being sequentially connected
Road, amplitude limiter circuit, subtraction circuit (i.e. scaling circuit) and add circuit (i.e. summing circuit in the same direction), the voltage warp that detection goes out
Overdriving and reverse integral, amplitude limit is carried out after amplifying, described logic is realized with add circuit by subtraction circuit then.
Preferably, the input of described reverse integral circuit be connected with for arrange AGC start-up operation start to control a little
First threshold circuit；Described subtraction circuit input is connected with the second threshold circuit of the critical point for arranging described, by subtracting
The combination of method circuit, add circuit and each threshold circuit completes the logical relation of Discrete control.
In the present embodiment, after logarithmic detector output voltage signal, it is exaggerated and reverse integral, the first thresholding of setting
Circuit can control starting to control a little for AGC start-up operations, and the first threshold circuit needs AGC to open during increasing for power output
Beginning work is started to control a little.Signal after integration enters subtraction circuit and add circuit, and the second threshold circuit of setting is for distinguishing the
One gain adjustment device and the separation of the second gain adjustment device, that is to say, that the second threshold circuit the second threshold value with
When upper, the first gain adjustment device action and the second gain adjustment device is failure to actuate, when below the second threshold value, the first gain
Adjusting means is in fixed operating state the second gain adjustment device controlled actuation simultaneously, so the gain control of whole passage
It is divided into two sections so that the gain-adjusted in the passage of high-gain Larger Dynamic scope can be realized very well.When small-signal is input into
Need the power bracket for adjusting less, it is only necessary to by a gain adjustment device action (i.e. the first gain adjustment device),
Need the power bracket for adjusting larger during big signal input, then need to adjust two gain adjustment devices (the first gain-adjusted dress
Put and the second gain adjustment device) realizing large-scale gain control.Two gain adjustment devices respectively by calculation process after
V_Con1 and V_Con2 controls, the amplitude limit threshold value that the maximum of V_Con1 is provided by amplitude limiter circuit limits, i.e. V_Con1's
Size of the maximum not over amplitude limit threshold value, the maximum of V_Con2 are limited by the maximum threshold that max threshold circuit is provided
System, i.e. size of the maximum of V_Con2 not over maximum threshold, so rationally arrange each thresholding value will make whole
Individual loop and radio-frequency channel are operated in a suitable scope, and Discrete control mode can be made very well linking and to allow passage
Gain-adjusted work in the range of linearity of respective devices, the device in control passage works so as to not in its linearly interval
Affect channel performance index.
As shown in Figure 2 and Figure 5, control signal V_Con1 of the gain adjustment device for computing circuit being processed out and V_
The logical relation of Con2 meets following table relation：
As shown in Fig. 4,5 and 6, GATE1 slowly adds in small-signal the schematic diagram of the present embodiment for the first gain adjustment device
Start its thresholding set-point for controlling work in big process, GATE2 is that the first gain adjustment device and the second gain-adjusted are filled
The thresholding control point of linking is put, GATE3 is the first gain adjustment device maximum voltage threshold point, and GATE4 is the second gain-adjusted
Device maximum voltage threshold point.The combination of these thresholdings can rationally control the first gain adjustment device and the second gain-adjusted dress
Put rational cooperating.
It should be noted that above-mentioned each threshold circuit and amplitude limiter circuit, each threshold value that can be to provide is determined
Point voltage, it is also possible to be to provide the set of circuits of each threshold value.Fig. 4,5 and 6 are only a kind of way of realization, are merely to illustrate this
Bright realizes what thought can be achieved on, and protection scope of the present invention is not limited to the specific circuit structure form.
Embodiment two：
As shown in figure 3, described AGC loop control module includes being respectively used to control the first gain adjustment device and second
The first control circuit and second control circuit of gain adjustment device；Wherein first control circuit includes the first drive being sequentially connected
Dynamic amplifying circuit, the first reverse integral circuit and the first amplitude limiter circuit, second control circuit include the second driving being sequentially connected
Amplifying circuit, negater circuit, the second reverse integral circuit and the second amplitude limiter circuit；The voltage that detection goes out is exported respectively and is driven to first
Dynamic amplifying circuit and the second drive amplification circuit.
Preferably, the input of the first described reverse integral circuit be connected with for arrange AGC start-up operation start to control
First threshold circuit of point；The input of the second described reverse integral circuit is connected with second of the critical point described in arranging
Ration the power supply road.
It is divided into two-way to be exaggerated respectively and reverse integral after logarithmic detector output voltage signal, in first control circuit
The first threshold circuit for arranging can control starting to control a little for AGC start-up operations, and as input power is needed during increasing
What AGC started working starts to control a little.The first amplitude limiter circuit for arranging is the maximum of the voltage for limiting the first gain adjustment device of control
Value, that is, control the maximum of voltage of the first gain adjustment device not over the amplitude limit threshold value that the first amplitude limiter circuit is arranged.
The 3rd threshold circuit arranged in second control circuit is the control point that signals reverse adjusts output valve, and the second threshold circuit is the
Two gain adjustment devices start the control point for starting gain-adjusted, i.e., start gain-adjusted to design in the first gain adjustment device
Maximum magnitude start the linking control point for starting the second gain adjustment device.The control voltage of the second gain adjustment device is most
Big value is limited by the second amplitude limiter circuit, i.e., its maximum is so rationally set not over the amplitude limit threshold value of the second amplitude limiter circuit
The value for putting each thresholding will be such that whole loop and radio-frequency channel is operated in a suitable scope, can carry out segmentation control
System can allow the gain-adjusted of passage to work in the suitable range of linearity of respective devices again, make the device in radio-frequency channel in its line
Property interval in work so as to not affecting channel performance index.
As shown in Fig. 4,7 and 8, GATE1 slowly adds in small-signal the schematic diagram of the present embodiment for the first gain adjustment device
Start its thresholding set-point for controlling work in big process, GATE3 is the thresholding of the start-up operation of the second gain adjustment device
Point, GATE4 are the second gain adjustment device maximum voltage threshold point, and GATE5 is the first gain adjustment device maximum voltage thresholding
Point.The combination of these thresholdings can rationally control the first gain adjustment device and the second gain adjustment device reasonably coordinates work
Make.
It should be noted that above-mentioned each threshold circuit and amplitude limiter circuit, each threshold value that can be to provide is determined
Point voltage, it is also possible to be to provide the set of circuits of each threshold value.Fig. 4,7 and 8 are only a kind of way of realization, are merely to illustrate this
Bright realizes what thought can be achieved on, and protection scope of the present invention is not limited to the specific circuit structure form.
Above content is further description made for the present invention with reference to specific preferred embodiment, it is impossible to assert
The present invention be embodied as be confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of without departing from present inventive concept, some simple deduction or replace can also be made, said structure should all be considered as belonging to
Protection scope of the present invention.
Claims (5)
1. a kind of digital microwave systems high-gain radio-frequency channel AGC control loops, it is characterised in that：It includes putting prime intermediate frequency
Second gain adjustment device of big module gain-adjusted, the first gain-adjusted dress to rear class intermediate frequency amplification module gain-adjusted
Put, intermediate frequency exports acquisition module, intermediate frequency power output detection module and AGC loop control module；Wherein, intermediate frequency output collection mould
The intermediate frequency output voltage of block collection, is carried out, after detection, carrying out through AGC loop control module by intermediate frequency power output detection module
Algorithm process, then control the second gain adjustment device and the first gain adjustment device respectively；
Corresponding intermediate frequency output when the gain of minimum and the second gain adjustment device is maximum by the gain of the first gain adjustment device
Voltage is used for realizing following logic as critical point, described algorithm process：When intermediate frequency output voltage is more than critical point, then keep
The gain of the second gain adjustment device is maximum, and the gain for controlling the first gain adjustment device reduces with the reduction of output voltage；
When intermediate frequency output voltage is less than critical point, then keep the gain of the first gain adjustment device minimum, control the second gain-adjusted dress
The gain that puts reduces with the reduction of output voltage；
After described prime intermediate frequency amplification module is arranged on the once mixing of high-gain radio-frequency channel；Described rear class intermediate frequency is put
After big module is arranged on the secondary mixing of high-gain radio-frequency channel；Described intermediate frequency output voltage is high-gain radio-frequency channel
Intermediate frequency output voltage.
2. digital microwave systems high-gain radio-frequency channel AGC control loops according to claim 1, it is characterised in that：Institute
Drive amplification circuit that the AGC loop control module that states includes being sequentially connected, reverse integral circuit, amplitude limiter circuit, subtraction circuit
And add circuit, the voltage that detection goes out carries out reverse integral, amplitude limit after drive amplification, then by subtraction circuit and addition
Logic described in circuit realiration.
3. digital microwave systems high-gain radio-frequency channel AGC control loops according to claim 2, it is characterised in that：Institute
The input of the reverse integral circuit that states be connected with for arrange AGC start-up operation the first threshold circuit for starting to control a little；Described
Subtraction circuit input be connected with the second threshold circuit of the critical point for arranging described.
4. digital microwave systems high-gain radio-frequency channel AGC control loops according to claim 1, it is characterised in that：Institute
The AGC loop control module that states includes the first control for being respectively used to control the first gain adjustment device and the second gain adjustment device
Circuit processed and second control circuit；The first drive amplification circuit that wherein first control circuit includes being sequentially connected, first reverse
Integrating circuit and the first amplitude limiter circuit, the second drive amplification circuit that second control circuit includes being sequentially connected, negater circuit,
Two reverse integral circuits and the second amplitude limiter circuit；
The voltage that detection goes out is exported respectively to the first drive amplification circuit and the second drive amplification circuit.
5. digital microwave systems high-gain radio-frequency channel AGC control loops according to claim 4, it is characterised in that：Institute
The input of the first reverse integral circuit that states be connected with for arrange AGC start-up operation the first threshold circuit for starting to control a little；
The input of the second described reverse integral circuit is connected with the second threshold circuit of the critical point for arranging described.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610907710.1A CN106505959B (en) | 2016-10-18 | 2016-10-18 | AGC control loop of high-gain radio frequency channel of digital microwave system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610907710.1A CN106505959B (en) | 2016-10-18 | 2016-10-18 | AGC control loop of high-gain radio frequency channel of digital microwave system |
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| Publication Number | Publication Date |
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| CN106505959A true CN106505959A (en) | 2017-03-15 |
| CN106505959B CN106505959B (en) | 2020-01-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490786A (en) * | 2017-06-30 | 2017-12-19 | 上海无线电设备研究所 | AGC loop feedback keeping method under strong jamming pattern |
| CN112910431A (en) * | 2021-01-20 | 2021-06-04 | 四川湖山电器股份有限公司 | Audio frequency amplitude limiting circuit and equipment with power supply rail tracking characteristic based on single power supply |
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| CN101674441A (en) * | 2008-09-09 | 2010-03-17 | 扬智科技股份有限公司 | Automatic gain controller and control method thereof |
| CN102064841A (en) * | 2009-11-16 | 2011-05-18 | 杭州士兰微电子股份有限公司 | Amplitude shift keying (ASK)/on-off keying (OOK) radio frequency (RF) receiving circuit |
| US20150365118A1 (en) * | 2014-06-11 | 2015-12-17 | Analog Devices Global | Low intermediate frequency receiver |
-
2016
- 2016-10-18 CN CN201610907710.1A patent/CN106505959B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674441A (en) * | 2008-09-09 | 2010-03-17 | 扬智科技股份有限公司 | Automatic gain controller and control method thereof |
| CN102064841A (en) * | 2009-11-16 | 2011-05-18 | 杭州士兰微电子股份有限公司 | Amplitude shift keying (ASK)/on-off keying (OOK) radio frequency (RF) receiving circuit |
| US20150365118A1 (en) * | 2014-06-11 | 2015-12-17 | Analog Devices Global | Low intermediate frequency receiver |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490786A (en) * | 2017-06-30 | 2017-12-19 | 上海无线电设备研究所 | AGC loop feedback keeping method under strong jamming pattern |
| WO2019000774A1 (en) * | 2017-06-30 | 2019-01-03 | 上海无线电设备研究所 | Agc loop feedback maintaining method under strong interference mode |
| CN107490786B (en) * | 2017-06-30 | 2020-04-17 | 上海无线电设备研究所 | AGC loop feedback keeping method under strong interference mode |
| CN112910431A (en) * | 2021-01-20 | 2021-06-04 | 四川湖山电器股份有限公司 | Audio frequency amplitude limiting circuit and equipment with power supply rail tracking characteristic based on single power supply |
| CN112910431B (en) * | 2021-01-20 | 2022-12-30 | 四川湖山电器股份有限公司 | Audio frequency amplitude limiting circuit and equipment with power supply rail tracking characteristic based on single power supply |
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| CN106505959B (en) | 2020-01-14 |
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