CN109474351A - A kind of AGC control method for satellite optical receiver circuit - Google Patents
A kind of AGC control method for satellite optical receiver circuit Download PDFInfo
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- CN109474351A CN109474351A CN201811592778.0A CN201811592778A CN109474351A CN 109474351 A CN109474351 A CN 109474351A CN 201811592778 A CN201811592778 A CN 201811592778A CN 109474351 A CN109474351 A CN 109474351A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of AGC control methods for satellite optical receiver circuit, comprising: step 1, is sampled using optical power of the optical power sample circuit to current input satellite photoreceiver, obtains input optical power values；Step 2, MCU obtains the input optical power values of the optical power sampling circuit samples, and is tabled look-up according to the input optical power values of acquisition, finds corresponding AGC control voltage；Step 3, the AGC found is controlled voltage input variable attenuation circuit by MCU；Step 4, variable attenuation circuit controls voltage value according to the AGC of input and adjusts radio frequency signal attenuation amount.The present invention inputs the optical power of satellite photoreceiver using MCU detection, voltage, which is controlled, by the AGC in MCU corresponds to table, corresponding AGC is exported to variable attenuation circuit and controls voltage, to accurately and quickly control radio frequency signal attenuation amount, effectively improves the response speed of satellite photoreceiver.
Description
Technical field
The present invention relates to photoreceiver, especially a kind of AGC control method for satellite optical receiver circuit.
Background technique
Traditional CATV and satellite L-Band is that two different modes are transmitted, and the bandwidth of operation of CATV is 47-860MHz, is defended
The bandwidth of operation 950-2150MHz of star L-Band.In order to reduce the cost of operator, propose CATV and satellite L-Band same
The transmission mode of optical fiber link.It is a kind of with the satellite photoreceiver that can receive wider range bandwidth therefore, it is necessary to research and develop, it uses
It is provided in the broadband signal for receiving CATV and satellite L-Band while reducing the cost of operator for user richer
Program resource.
Summary of the invention
The technical problems to be solved by the present invention are: in view of the above problems, it is electromechanical to provide a kind of satellite light-receiving
The AGC control method on road can be mentioned effectively using the radio frequency signal attenuation amount of AGC control method control satellite photoreceiver
The response speed of high satellite photoreceiver.
The technical solution adopted by the invention is as follows:
A kind of AGC control method for satellite optical receiver circuit, comprising the following steps:
Step 1, it is sampled, is obtained defeated using optical power of the optical power sample circuit to current input satellite photoreceiver
Optical power value；
Step 2, MCU obtains the input optical power values of the optical power sampling circuit samples, and according to the institute of acquisition
It states input optical power values to table look-up, finds corresponding AGC control voltage；
Step 3, the AGC found is controlled voltage input variable attenuation circuit by MCU；
Step 4, variable attenuation circuit controls voltage value according to the AGC of input and adjusts radio frequency signal attenuation amount.
Preferably, it in step 1, is adopted using optical power of the optical power sample circuit to current input satellite photoreceiver
The method of sample, specifically using the optical power of optical power sample circuit detection photoelectric conversion circuit；
The photoelectric conversion circuit, comprising: capacitor C1, capacitor C3, capacitor C4, capacitor C38, capacitor C39, photodetector
PIN-IN, inductance L2, resistance R1 and resistance R2；Photodetector PIN-IN ground terminal ground connection, cathode connect 5V DC voltage,
It being grounded further through capacitor C38, capacitor C39, anode is grounded by capacitor C1, and connects level-one amplifying circuit, while further through
Inductance L2, resistance R2 connection optical power sample circuit；Inductance L2 is grounded by resistance R1；The both ends of resistance R2 pass through capacitor respectively
C3 and capacitor C4 ground connection.
Preferably, the optical power sample circuit, comprising: capacitor C49, capacitor C50, amplifier U2B, resistance R22, resistance
R23 and resistance R24；The optical power output end of the positive input connection photoelectric conversion circuit of amplifier U2B, and pass through capacitor
C49 ground connection；The reverse input end of amplifier U2B is grounded by resistance R22；The output end of amplifier U2B passes through resistance R23 and its
Reverse input end connection；The output end of amplifier U2B passes through the optical power sampling end of resistance R24 connection MCU.
Preferably, MCU follows circuit by AGC signal, by the AGC found control voltage input variable attenuation electricity
Road；
The AGC signal follows circuit, comprising: capacitor C52, capacitor C53, capacitor C56, resistance R27, resistance R28, resistance
R29 and amplifier U2A；The AGC signal output end of MCU connects one end of resistance R27 and resistance R28 simultaneously；Resistance R27's is another
End ground connection；The positive input of resistance R28 connection amplifier U2A, and pass through capacitor C52 and capacitor C53 capacity earth；Amplifier
The output end of U2A is connect with its reverse input end, and is grounded by capacitor C56；Meanwhile the output end of amplifier U2A passes through electricity
Hold the AGC control signal input of R29 connection variable attenuation circuit.
Preferably, the variable attenuation circuit, comprising: include: π type diode, and be connected to the AGC of π type diode
Control signal input circuit, radiofrequency signal input circuit, radiofrequency signal output circuit and pad value reference circuit；The AGC control
The AGC signal of signal input circuit connection AGC control circuit processed follows circuit；The radiofrequency signal input circuit connection level-one is put
Big circuit；The radiofrequency signal output circuit connection signal distributor circuit.
Preferably, in step 2, the table tabled look-up are as follows:
| Input optical power values (dBm) | Photodetector detects voltage (V) | AGC controls voltage (V) | Pad value (dB) |
| +3 | 3.86 | 0.92 | 20 |
| +2.5 | 3.34 | 0.94 | 19 |
| +2 | 3.0 | 0.97 | 18 |
| +1.5 | 2.7 | 1.01 | 17 |
| +1 | 2.42 | 2.12 | 16 |
| +0.5 | 2.18 | 1.07 | 15 |
| 0 | 1.98 | 1.15 | 14 |
| -0.5 | 1.74 | 1.22 | 13 |
| -1 | 1.52 | 1.25 | 12 |
| -1.5 | 1.32 | 1.28 | 11 |
| -2 | 1.18 | 1.35 | 10 |
| -2.5 | 1.04 | 1.48 | 9 |
| -3 | 0.92 | 1.54 | 8 |
| -3.5 | 0.82 | 1.8 | 7 |
| -4 | 0.74 | 1.93 | 6 |
| -4.5 | 0.66 | 2.1 | 5 |
| -5 | 0.58 | 2.43 | 4 |
| -5.5 | 0.5 | 3.23 | 3 |
| -6 | 0.46 | 3.34 | 2 |
| -6.5 | 0.38 | 3.45 | 1 |
| -7 | 0.36 | 3.49 | 0 |
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
The present invention is controlled using the optical power of MCU detection input satellite photoreceiver by the AGC being stored in advance in MCU
Voltage processed corresponds to table, exports corresponding AGC to variable attenuation circuit and controls voltage, so that more accurate rapidly control satellite light
The radio frequency signal attenuation amount of receiver, can effectively improve the response speed of satellite photoreceiver.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the satellite optical receiver circuit structure chart with three-level enlarger of the invention.
Fig. 2 is DC/DC circuit diagram of the invention.
Fig. 3 a-3b is AGC electric operation control circuit figure of the invention.
Fig. 4 is photoelectric conversion circuit figure of the invention.
Fig. 5 is level-one amplification circuit diagram of the invention.
Fig. 6 is variable attenuation circuit figure of the invention.
Fig. 7 is signal distribution circuit figure of the invention.
Fig. 8 is second amplifying circuit figure of the invention.
Fig. 9 is three-stage amplifier figure of the invention.
Figure 10 is main signal output circuit figure of the invention.
Figure 11 is detection signal output apparatus figure of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention, i.e., described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is logical
The component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, claimed invention is not intended to limit to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but be merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment
A kind of satellite optical receiver circuit that present pre-ferred embodiments provide, as shown in Figure 1, comprising: AGC control electricity
Road, photoelectric conversion circuit, level-one amplifying circuit, variable attenuation circuit, signal distribution circuit, detection signal output apparatus, second level
Amplifying circuit, three-stage amplifier and main signal output circuit；The photoelectric conversion circuit is sequentially connected level-one amplifying circuit, can
Become attenuator circuit and signal distribution circuit；The first via output end of the signal distribution circuit be sequentially connected second amplifying circuit,
Three-stage amplifier and main signal output circuit；Second road output end connecting detection signal of the signal distribution circuit exports electricity
Road；The AGC control circuit is connect with photoelectric conversion circuit and variable attenuation circuit simultaneously.
After photoelectric conversion circuit receives the optical power signals of CATV and satellite L-Band and is converted into radiofrequency signal, it is sent to
Level-one amplifying circuit is sent to variable attenuation circuit through the amplified signal of level-one, and the signal after decaying is distributed by signal
Circuit is divided into two-way radiofrequency signal: radiofrequency signal RF1 required for successively exporting after second level amplification and three-level amplification all the way；
Radiofrequency signal RF2 of the another way through detection circuit output for product working status detection.In first order amplification, pass through AGC
Control circuit samples optical power currently entered, and exports AGC control letter according to the size of the input optical power of sampling
Number to variable attenuation circuit, the control voltage of attenuator circuit is adjusted, guarantees to provide suitable output size for next stage processing
Signal, to realize the accurate control function of AGC.
Satellite optical receiver circuit simultaneously further include: DC/DC circuit；Using the DC/DC circuit connection external electrical of low noise
Source is the power supply of other function circuit, reduces the interference to other function circuit.
Specifically, for the AGC control method of satellite optical receiver circuit, comprising the following steps:
Step 1, it is sampled, is obtained defeated using optical power of the optical power sample circuit to current input satellite photoreceiver
Optical power value；
Step 2, MCU obtains the input optical power values of the optical power sampling circuit samples, and according to the institute of acquisition
It states input optical power values to table look-up, finds corresponding AGC control voltage；
Step 3, the AGC found is controlled voltage input variable attenuation circuit by MCU；
Step 4, variable attenuation circuit controls voltage value according to the AGC of input and adjusts radio frequency signal attenuation amount.
In step 2, the table tabled look-up is obtained by test, which is stored in advance in MCU, or is stored in advance
It is in the memory of MCU connection to read for MCU.The table tabled look-up is as shown in Table 1.
Table one:
| Input optical power values (dBm) | Photodetector detects voltage (V) | AGC controls voltage (V) | Pad value (dB) |
| +3 | 3.86 | 0.92 | 20 |
| +2.5 | 3.34 | 0.94 | 19 |
| +2 | 3.0 | 0.97 | 18 |
| +1.5 | 2.7 | 1.01 | 17 |
| +1 | 2.42 | 2.12 | 16 |
| +0.5 | 2.18 | 1.07 | 15 |
| 0 | 1.98 | 1.15 | 14 |
| -0.5 | 1.74 | 1.22 | 13 |
| -1 | 1.52 | 1.25 | 12 |
| -1.5 | 1.32 | 1.28 | 11 |
| -2 | 1.18 | 1.35 | 10 |
| -2.5 | 1.04 | 1.48 | 9 |
| -3 | 0.92 | 1.54 | 8 |
| -3.5 | 0.82 | 1.8 | 7 |
| -4 | 0.74 | 1.93 | 6 |
| -4.5 | 0.66 | 2.1 | 5 |
| -5 | 0.58 | 2.43 | 4 |
| -5.5 | 0.5 | 3.23 | 3 |
| -6 | 0.46 | 3.34 | 2 |
| -6.5 | 0.38 | 3.45 | 1 |
| -7 | 0.36 | 3.49 | 0 |
The structure and working principle of entire satellite optical receiver circuit are described in detail below:
(1) DC/DC circuit
As shown in Fig. 2, a kind of DC/DC circuit provided in this embodiment, specifically includes that electric connector DC12VIN, diode
D8, diode D9, capacitor C23, capacitor C24, capacitor C25, capacitor C26, capacitor C27, capacitor C28, capacitor C29, direct current conversion
Module U1, diode D10, inductance L1, resistance R32, resistance R31, capacitor C33, capacitor C34, capacitor C35, capacitor C36, capacitor
C37 and capacitor C38；The positive input of electric connector DC12VIN terminates 12V power supply；The negative input end of diode D8, diode D9
Positive input terminal and capacitor C23, capacitor C24, capacitor C25 and one end of capacitor C26 connect the just defeated of electric connector DC12VIN
Enter end；The end G of electric connector DC12VIN and the end gnd ground connection, the positive input terminal of diode D8 and capacitor C23, capacitor C24,
The other end of capacitor C25 and capacitor C26 ground connection；The voltage input end of the negative input end connection DC conversion modules U1 of diode D9
1 foot of (1 foot), DC conversion modules U1 is grounded by capacitor C27, capacitor C28 and capacitor C29；4 feet of DC conversion modules U1
Vacantly, 5 feet, 6 feet, 7 feet and 8 feet ground connection；One end of feedback end (3 foot) the connection resistance R31 of DC conversion modules U1, resistance
Output end of the other end of R31 as DC/DC circuit exports 5V as the power supply of other function circuit；The other end of resistance R31 connects
The positive input terminal of diode D10；The voltage output end (2 foot) of the negative input end connection DC conversion modules of diode；Inductance L1
It is connected in parallel on the both ends of resistance R31；Resistance R32, resistance R31, capacitor C33, capacitor C34, capacitor C35, capacitor C36, capacitor C37 and
One end of capacitor C38 is grounded, and the other end connects the other end of resistance R31.
Wherein, diode D8 is TVS protection diode, prevents the component of the excessively high damage subsequent conditioning circuit of input voltage, especially
It is reversal connection power supply, and the peak voltage powered suddenly.Diode D9 guarantees that the 12V voltage of input is DC conversion modules U1
1 foot (voltage input end) unidirectionally power, prevent electric current shipwreck；
Capacitor C23, capacitor C24, capacitor C25, capacitor C26, capacitor C27, capacitor C28 and capacitor C29 are as low frequency filtering
Circuit prevents low-frequency disturbance；Inductance L1, capacitor C33, capacitor C34, capacitor C35, capacitor C36, capacitor C37 and capacitor C38 conduct
Resonator filter circuit；
The feedback end (3 foot) of DC conversion modules U1 divides circuit by external resistance R31 and resistance R32, for examining
Survey and adjust output voltage.
DC conversion modules U1 is the DC conversion modules of low switching frequency, preferably, the DC power supplier U1
Switching frequency≤200KHz, can choose XL1509.
(2) AGC control circuit
As best shown in figures 3 a and 3b, AGC control circuit provided in this embodiment specifically includes that MCU, MCU select new pool science and technology
T84F16T20；And
Optical power sample circuit specifically includes that capacitor C49, capacitor C50, amplifier U2B, resistance R22, resistance R23 and electricity
Hinder R24；The optical power output end of the positive input connection photoelectric conversion circuit of amplifier U2B, and be grounded by capacitor C49；
The reverse input end of amplifier U2B is grounded by resistance R22；The output end of amplifier U2B passes through resistance R23 and its reversed input
End connection；The output end of amplifier U2B passes through the optical power sampling end (20 foot) of resistance R24 connection MCU (U5)；
AGC signal follows circuit, comprising: capacitor C52, capacitor C53, capacitor C56, resistance R27, resistance R28, resistance R29
With amplifier U2A；The AGC signal output end (1 foot) of MCU (U5) connects one end of resistance R27 and resistance R28 simultaneously；Resistance R27
The other end ground connection；The positive input of resistance R28 connection amplifier U2A, and pass through capacitor C52 and capacitor C53 capacity earth；
The output end of amplifier U2A is connect with its reverse input end, and is grounded by capacitor C56；Meanwhile the output end of amplifier U2A
Pass through the AGC control signal input of capacitor R29 connection variable attenuation circuit；
The input optical power values of acquisition are sent into the optical power sampling end of MCU (U5) after the amplification of optical power sample circuit
(20 foot)；Input optical power values according to the spacing of 0.5dBm, are carried out+3dBm~-7dBm input optical power values by MCU with it
The scheme of comparison of tabling look-up is corresponded and is carried out in the way of the corresponding 20dB pad value of+3dBm to the corresponding 0dB pad value of -7dBm
Pwm signal output, pwm signal are the digital signal of different duty, follow circuit to amplify and filter using AGC signal and export
AGC controls signal.
The AGC control circuit, further includes reset circuit；The reset circuit includes: resistance R25, resistance R26 and capacitor
C51；The reset terminal (4 foot) of MCU passes sequentially through resistance R25 and connects 5V DC voltage with resistance R26；Resistance R25 and resistance R26 it
Between be grounded by capacitor C51；
The AGC control circuit further includes state circuit for lamp；The state circuit for lamp include: resistance R33, resistance R35 and
Dual-colored LED lamp；By resistance R33 connection 5V DC voltage, green light signals end (2 foot) passes through the power end (1 foot) of dual-colored LED lamp
18 feet of resistance R35 connection MCU (U5), red signal end (3 foot) connect 17 feet of MCU (U5)；By 17 feet of MCU (U5) and
18 feet export the bright light color of control signal control dual-colored LED lamp respectively, for the size according to the input optical power values of sampling
Range is alarmed, and judges whether to work normally, if the model that the input optical power values of sampling do not record in the table tabled look-up
In enclosing, then red alarm is shown, otherwise show that green light indicates to work normally.
(3) photoelectric conversion circuit
As shown in figure 4, the photoelectric conversion circuit, comprising: capacitor C1, capacitor C3, capacitor C4, capacitor C38, capacitor C39,
Photodetector PIN-IN, inductance L2, resistance R1 and resistance R2；Photodetector PIN-IN ground terminal ground connection, cathode connection
5V DC voltage is grounded further through capacitor C38, capacitor C39, and anode is grounded by capacitor C1, and connects level-one amplifying circuit,
Simultaneously further through optical power input terminal (the positive input of amplifier U2B of inductance L2, resistance R2 connection optical power sample circuit
End)；Inductance L2 is grounded by resistance R1；The both ends of resistance R2 pass through capacitor C3 and capacitor C4 ground connection respectively；
Photodetector PIN-IN selects O-Send OPD-1-4-C-P-SC, receives the light function of CATV and satellite L-Band
Rate signal is simultaneously converted into after radiofrequency signal output to level-one amplifying circuit, meanwhile, pass through inductance L2, resistance R1, resistance R2, capacitor
The load branch of C3 and capacitor C4 composition is exported to the optical power sample circuit of AGC control circuit.Capacitor C38 and capacitor C39 are
The 5V DC voltage of input provides filter action.
(4) level-one amplifying circuit
As shown in figure 5, the level-one amplifies capacitor, comprising: amplifier U4, inductance L2, inductance L4, capacitor C2, capacitor C40
With capacitor C41；The input terminal of amplifier U4 passes through the RF signal input end (photodetection of capacitor C2 connection photoelectric conversion circuit
The anode of device PIN-IN), output end connects one end of inductance L3；The other end of inductance L3 connects variable attenuation circuit, simultaneously
One end of inductance L4 is connected again；The other end of inductance L4 connects 5V DC voltage, while connecing further through capacitor C40 and capacitor C41
Ground.
The radiofrequency signal progress first order amplification that level-one amplifying circuit exports photoelectric conversion circuit, gain amplifier 20db,
So that subsequent conditioning circuit is handled.Capacitor C40 and capacitor C41 provides filter action for the 5V DC voltage of input.
(5) variable attenuation circuit
As shown in fig. 6, the variable attenuation circuit, comprising: π type diode, and it is connected to the AGC control of π type diode
Signal input circuit, radiofrequency signal input circuit, radiofrequency signal output circuit and pad value reference circuit processed；The AGC control
The AGC signal of signal input circuit connection AGC control circuit follows circuit；The radiofrequency signal input circuit connection level-one amplification
Circuit；The radiofrequency signal output circuit connection signal distributor circuit；Specifically, the variable attenuation circuit, comprising: π type two
Pole pipe D1, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C42, capacitor C55, electricity
Hinder R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 and inductance L17；1 foot of π type diode D1 passes through
Capacitor C11 connection signal distributor circuit；2 feet of π type diode D1 are grounded by capacitor C55 and capacitor C6, and connect AGC control
The AGC signal output end of circuit；3 feet of π type diode D1 pass through capacitor C5 connection level-one amplifying circuit；The 4 of π type diode D1
Foot is grounded by capacitor C7, and connects one end of resistance R5；5 feet of π type diode D1 are grounded by capacitor C8, and connect resistance
One end of R6；The other end of resistance R5 and resistance R6 are grounded by capacitor C9 and capacitor C10；Meanwhile the other end of resistance R6 connects
One end of connecting resistance R7；The other end of resistance R7 is grounded by resistance R8, further through resistance R9 connection 5V DC voltage；Resistance R9
One end of connection 5V DC voltage also passes through capacitor C42 and is grounded；
Wherein, the model HMSP3816 of π type diode D1 is made of 4 diodes；The variable attenuation circuit connects
The AGC for receiving the output of AGC control circuit controls signal, and the control voltage by controlling π type diode D1 adjusts variable attenuation circuit
Pad value, provide sizeable radiofrequency signal for subsequent conditioning circuit.Wherein, resistance R3 and resistance R4 is π type diode D1's
Load resistance；Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, capacitor C9, capacitor C10 and capacitor C42 form itself and decline
Depreciation control circuit controls itself pad value 3db of variable attenuation circuit；Capacitor C55, capacitor C6 and inductance L17 are controlled as AGC
The filter circuit of signal processed.
(6) signal distribution circuit
As shown in fig. 7, the signal distribution circuit, comprising: adjustable resistance W, inductance L16, capacitor C56, resistance R10, electricity
Hinder R11 and resistance R12；Resistance R10 is connected with one end of resistance R11, while variable decline is connected between resistance R10 and resistance R11
Powered down road；The other end of resistance R10 and resistance R11 are separately connected the both ends of resistance R12；One end of resistance R10 connects inductance L16
One end, while connecting second amplifying circuit；The other end of inductance L16 is grounded by capacitor C56, is connect further through adjustable resistance W
Ground；One end connection detection circuit of resistance R11；
The resistance combination method of salary distribution that the signal distribution circuit is formed using resistance R10, resistance R11 and resistance R12, will
The radiofrequency signal all the way of variable attenuation circuit output is divided into two-way radiofrequency signal；Wherein, by the other end of resistance R10 as
Output end all the way, by the other end of resistance R11 as the second road output end；The radiofrequency signal of the first via output end is successively
It is main output signal RF1 by the output of second amplifying circuit, three-stage amplifier and main signal output circuit；Second road is defeated
The radiofrequency signal of outlet output is detection signal RF2 by the output of detection output circuit.
(7) second amplifying circuit
As shown in figure 8, the second amplifying circuit, comprising: amplifier U5, inductance L7, inductance L8, capacitor C12, capacitor
C45；The input terminal of amplifier U5 connects one end of inductance L7 by capacitor C12 connection signal distributor circuit, output end；Inductance
The other end of L7 connects three-stage amplifier, while connecting one end of inductance L8 again；The other end of inductance L8 connects 5V direct current
Pressure, while being grounded further through capacitor C45；Wherein, of adjustable resistance W, capacitor C56 and inductance L16 composition signal distribution circuit
With absorbing circuit.
The radiofrequency signal for the first via output end output that the second amplifying circuit exports signal distribution circuit carries out two
Grade amplification, gain amplifier 20db；Wherein, capacitor C45 and inductance L8 provides filter action for the 5V DC voltage of input.
(8) three-stage amplifier
As shown in figure 9, the three-stage amplifier, comprising: amplifier U6, inductance L9, inductance L10, capacitor C13, capacitor
C14, capacitor C16, capacitor C46, resistance R13；Amplifier U6 passes sequentially through C capacitor C16, resistance R13, capacitor C13 connection second level
Amplifying circuit；It is grounded between capacitor 13 and capacitor R13 by capacitor C14；The output end of amplifier U6 passes sequentially through inductance L9, electricity
Feel L10 and capacitor C46 ground connection；Main signal output circuit is connected between inductance L9 and inductance L10；
The radiofrequency signal that the three-stage amplifier exports second amplifying circuit carries out three-level amplification, gain amplifier
16db。
(9) main signal output circuit
As shown in Figure 10, the main signal output circuit, comprising: capacitor C17, capacitor C18, resistance R14, resistance R15, electricity
Hinder R16, diode D2, diode D3 and out connector RFOUT1；1 foot of out connector RFOUT1 passes sequentially through capacitor
C18, resistance R16, resistance R14, capacitor C17 connection three-stage amplifier；It is connect between resistance R14 and resistance 16 by resistance R15
Ground, while 3 feet of diode D2 are connected again；1 foot and 2 feet of diode D2 is separately connected 1 foot and 2 feet of diode D3；Two poles
3 feet of pipe D3 are grounded；
The main signal output circuit prevents the excessively high damage of moment main signal levels from putting by diode D2 and diode D3
Large chip.
(10) output circuit is detected
As shown in figure 11, the detection output circuit, comprising: detection signal amplification circuit and detection signal output apparatus；
The detection signal amplification circuit, comprising: amplifier U11, inductance L12, inductance L13, capacitor C20 and capacitor C44；
The input terminal of amplifier U11 connects one end of inductance L12 by capacitor C20 connection signal distributor circuit, output end；Inductance
The other end connecting detection signal output apparatus of L12, while one end of inductance L13 is connected again；The other end of inductance L13 connects 5V
DC voltage, while being grounded further through capacitor C44；
The detection signal output apparatus, comprising: capacitor C21, capacitor C49, resistance R17, resistance R18, resistance R19, two
Pole pipe D4, diode D5 and out connector RFOUT2；1 foot of out connector RFOUT2 passes sequentially through capacitor C49, resistance
R19, resistance R17, capacitor C21 connecting detection signal amplification circuit；It is grounded between resistance R17 and resistance 19 by resistance R18, together
When again connect diode D4 3 feet；1 foot and 2 feet of diode D4 is separately connected 1 foot and 2 feet of diode D5；Diode D5's
3 feet ground connection；
The radiofrequency signal for the second road output end output that the detection output circuit exports signal distribution circuit carries out two
Grade amplification, exports the radiofrequency signal of 20db lower than main signal, is used for signal detection, can check the work shape of satellite photoreceiver
State.
The working principle of the detection signal output apparatus passes through diode D4 and diode with main signal output circuit
D5 prevents the excessively high damage amplification chip of moment detection signal level.
Preferably, the level-one amplifying circuit, second amplifying circuit and three-stage amplifier are extremely low using noise
GaASMMIC (GaAs MMIC).
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (6)
1. a kind of AGC control method for satellite optical receiver circuit, which comprises the following steps:
Step 1, it is sampled using optical power of the optical power sample circuit to current input satellite photoreceiver, obtains input light
Performance number；
Step 2, MCU obtains the input optical power values of the optical power sampling circuit samples, and according to the described defeated of acquisition
Optical power value is tabled look-up, and corresponding AGC control voltage is found；
Step 3, the AGC found is controlled voltage input variable attenuation circuit by MCU；
Step 4, variable attenuation circuit controls voltage value according to the AGC of input and adjusts radio frequency signal attenuation amount.
2. being used for the AGC control method of satellite optical receiver circuit as described in claim 1, which is characterized in that in step 1,
The method sampled using optical power of the optical power sample circuit to current input satellite photoreceiver, specifically uses light function
The optical power of rate sample circuit detection photoelectric conversion circuit；
The photoelectric conversion circuit, comprising: capacitor C1, capacitor C3, capacitor C4, capacitor C38, capacitor C39, photodetector PIN-
IN, inductance L2, resistance R1 and resistance R2；Photodetector PIN-IN ground terminal ground connection, cathode connect 5V DC voltage, and logical
Capacitor C38, capacitor C39 ground connection are crossed, anode is grounded by capacitor C1, and connects level-one amplifying circuit, while further through inductance
L2, resistance R2 connection optical power sample circuit；Inductance L2 is grounded by resistance R1；The both ends of resistance R2 pass through respectively capacitor C3 and
Capacitor C4 ground connection.
3. being used for the AGC control method of satellite optical receiver circuit as described in claim 1, which is characterized in that the smooth function
Rate sample circuit, comprising: capacitor C49, capacitor C50, amplifier U2B, resistance R22, resistance R23 and resistance R24；Amplifier U2B
Positive input connection photoelectric conversion circuit optical power output end, and be grounded by capacitor C49；Amplifier U2B's is reversed
Input terminal is grounded by resistance R22；The output end of amplifier U2B is connect by resistance R23 with its reverse input end；Amplifier
The output end of U2B passes through the optical power sampling end of resistance R24 connection MCU.
4. being used for the AGC control method of satellite optical receiver circuit as claimed in claim 2, which is characterized in that MCU passes through
AGC signal follows circuit, and the AGC found is controlled voltage input variable attenuation circuit；The AGC signal follows circuit,
It include: capacitor C52, capacitor C53, capacitor C56, resistance R27, resistance R28, resistance R29 and amplifier U2A；The AGC signal of MCU
Output end connects one end of resistance R27 and resistance R28 simultaneously；The other end of resistance R27 is grounded；Resistance R28 connection amplifier U2A
Positive input, and pass through capacitor C52 and capacitor C53 capacity earth；The output end of amplifier U2A and its reverse input end connect
It connects, and is grounded by capacitor C56；Meanwhile the output end of amplifier U2A is controlled by the AGC of capacitor R29 connection variable attenuation circuit
Signal input part processed.
5. being used for the AGC control method of satellite optical receiver circuit as described in claim 1, which is characterized in that described variable
Attenuator circuit, comprising: include: π type diode, and be connected to AGC control signal input circuit, the radio frequency letter of π type diode
Number input circuit, radiofrequency signal output circuit and pad value reference circuit；The AGC control signal input circuit connection AGC control
The AGC signal of circuit processed follows circuit；The radiofrequency signal input circuit connects level-one amplifying circuit；The radiofrequency signal output
Circuit connection signal distribution circuit.
6. being used for the AGC control method of satellite optical receiver circuit as described in claim 1, which is characterized in that in step 2,
The table tabled look-up are as follows:
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| CN113258895A (en) * | 2021-06-10 | 2021-08-13 | 武汉长光科技有限公司 | Gain control method, gain control device, gain control circuit, optical receiver, optical device, and storage medium |
| CN113315484A (en) * | 2021-05-31 | 2021-08-27 | 广州市迪士普音响科技有限公司 | Wireless broadcast exciter and PIN attenuation circuit |
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| CN109474351B (en) | 2021-07-20 |
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