CN104506242B - A kind of AGC control methods of management type family expenses photoreceiver - Google Patents
A kind of AGC control methods of management type family expenses photoreceiver Download PDFInfo
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- CN104506242B CN104506242B CN201410819790.6A CN201410819790A CN104506242B CN 104506242 B CN104506242 B CN 104506242B CN 201410819790 A CN201410819790 A CN 201410819790A CN 104506242 B CN104506242 B CN 104506242B
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Abstract
The present invention provides a kind of AGC control methods of management type family expenses photoreceiver, and this method comprises the following steps：(1) MCU is sampled to the luminous power of current input photoreceiver, obtains input optical power values；(2) tabled look-up according to the input optical power values, find AGC control voltage values；(3) control voltage of first stage amplifier is adjusted according to the AGC control voltages value, realizes AGC controls.The present invention realize AGC functions speed more than tradition algorithm calculating by way of it is fast, can so effectively improve the response time of receiver；And MCU simple, efficiency highs and code is realized and is also easier in a manner of lookup table mode is realized and calculated more than traditional algorithm.
Description
Technical field
The present invention relates to photoreceiver field, more particularly, to a kind of AGC control methods of management type family expenses photoreceiver.
Background technology
Whole radio, TV and film industries are competing with registering one's residence for telecommunications, UNICOM and movement in " three nets " fusion progradation is carried out at present
Strive it is more and more fierce, major operator currently or have begun to implement fiber entering household access way, and radio, TV and film industries will
Want that fiber entering household must also be realized by playing an active part in market competition, the fiber entering household of broadcasting and TV enters different from the optical fiber of the operators such as telecommunications
Family, broadcasting and TV fiber entering household are not only more to need to enter cable television progress optical fiber comprising data services such as broadband, voices
Family.
The receiver of conventional cable television fiber entering household is general all without AGC functions at present, even with AGC functions,
It realizes that the speed of AGC functions is mostly relatively slow, and extreme influence exports the precision of RF radiofrequency signals.
The content of the invention
It is an object of the invention to：The problem of existing for prior art, there is provided a kind of management type family expenses photoreceiver
AGC control methods, solve conventional optical receivers and realize that the speed of AGC functions is mostly relatively slow, extreme influence output RF radiofrequency signals
Precision.
The goal of the invention of the present invention is achieved through the following technical solutions：
A kind of AGC control methods of management type family expenses photoreceiver, it is characterised in that this method comprises the following steps：
(1) MCU is sampled to the luminous power of current input photoreceiver, obtains input optical power values；
(2) tabled look-up according to the input optical power values, find AGC control voltage values；
(3) control voltage of first stage amplifier is adjusted according to the AGC control voltages value, realizes AGC controls.
Preferably, the circuit used when step (1) is sampled includes resistance R35, amplifier U5, resistance R36, resistance
R37, resistance R38, resistance R12, electric capacity C15, resistance R11, electric capacity C16 and the positive of amplifier U6, the amplifier U5 input
The output end by resistance R36 connection amplifiers U6, reverse input end is held to be grounded by resistance R38, one end of the resistance R37
Power supply, other end connection amplifier U5 reverse input end are connect, the electric capacity C15, resistance R12 are connected in parallel on amplifier U6 itself
Output end and reverse input end between, the reverse input end of the amplifier U6 is grounded by resistance R11, the amplifier U6
Positive input be grounded by electric capacity C16.
Preferably, the output end of the amplifier U5 passes through resistance R35 connection clock signals.
Preferably, the positive source termination power supply of the amplifier U5, power cathode end ground connection.
Preferably, the table that step (2) is tabled look-up is：
Compared with prior art, the present invention has advantages below：
1st, after MCU detects input optical power, realize AGC functions speed more than tradition algorithm calculating by way of it is fast,
The response time of receiver can so be effectively improved；
2nd, MCU simple, efficiency highs and code is realized and also more held in a manner of lookup table mode is realized and calculated more than traditional algorithm
Easily.
Brief description of the drawings
Fig. 1 is the structural representation of management type family expenses photoreceiver；
Fig. 2 is AGC signal circuit figures；
Fig. 3 is ATT signal circuit figures；
Fig. 4 is the electrical block diagram that management type family expenses photoreceiver removes MCU parts；
Fig. 5 is power-switching circuit figure；
Fig. 6 is optical receiver systems interface schema；
Fig. 7 is photoelectric switching circuit figure；
Fig. 8 is light power detection circuit figure；
Fig. 9 is RF level sensitive circuit figures；
Figure 10 is one-level amplification circuit diagram；
Figure 11 is the AGC module circuit diagrams of numerical-control attenuator；
Figure 12 is second amplifying circuit figure；
Figure 13 is RF signal acquisition circuit figures；
Figure 14 is MCU circuit diagrams；
Figure 15 is MCU external clock input circuit；
Figure 16 is MCU reset reset circuit；
Figure 17 is MCU system input circuit；
Figure 18 is MCU I2C circuits；
Figure 19 is MCU ADC signal input circuit；
Figure 20 is the earthed circuit of MCU ADC signal input interface；
Figure 21 is the oscillograph test circuit figure of AGC signal circuits；
Figure 22 is oscillograph test result figure.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present invention provides a kind of AGC control methods of management type family expenses photoreceiver, for management type family expenses light-receiving
Machine.The structure of whole management type family expenses photoreceiver as shown in figure 1, its mainly by connector, photoelectric switching circuit (PIN w/o
WDM), light power detection circuit, MCU, two amplifiers, numerical-control attenuator, RF level sensitive circuits, AGC signal circuits,
ATT signal circuits and signal acquisition circuit composition.
Wherein light power detection circuit, MCU and AGC signal circuits composition AGC control circuits, light power detection circuit
Input be connected with photoelectric switching circuit, output end and MCU optical power signals input port connect.MCU AGC control signals
Output end is connected by the AGC control terminals of AGC signal circuits and numerical-control attenuator.
When carrying out AGC controls using AGC control circuits, its method comprises the following steps：
(1) MCU is sampled by light power detection circuit to the luminous power of current input photoreceiver, obtains input light
Performance number；
(2) tabled look-up according to the input optical power values, find AGC control voltage values；
(3) control voltage of first stage amplifier is adjusted according to the AGC control voltages value, realizes AGC controls.
The table looked into step (2) just obtains by test, then stores the table and is read for MCU.We
When selecting PIN pipes, degree of being in response to >=0.9 of selection, we have selected 100 PIN pipe responsivenesses when testing
>=0.9 tests, and all values calculate the test record drawn after average value, and optical power change is according to 0.2dBm in measurement process
Tested as step units, and in test process, ensure output level of the input optical power in -12.0dBm for mark
Quasi- level, when changing luminous power, ensure that output level is fiduciary level by changing the voltage of AGC points position, by 100
The result that the data test of branch PIN pipes is drawn, it is found that the voltage that PIN pipes convert is nonlinear, and with input light
Power is lower, and the voltage that PIN pipes convert is also lower, and the voltage difference of adjacent input optical power is also less and less.Test
Resulting table is：
Wherein RF level sensitive circuits, MCU and ATT signal circuits composition ATT control circuits, RF level sensitive circuits
Input be connected with signal acquisition circuit, the output ends of RF level sensitive circuits and MCU RF sampled levels input port connect.
MCU ATT control signal outputs are connected by the ATT control terminals of ATT signal circuits and numerical-control attenuator.
After 1550nm or 1310nm optical signals are converted into electric signal by photoelectric switching circuit, one-level amplifying circuit is sent to,
Signal after one-level is amplified is sent to numerical-control attenuator, and the signal after decay after two level is amplified, becomes required and penetrated again
Frequency RF signals simultaneously export.When the first order is amplified, (mainly luminous power is sampled to the luminous power currently inputted by MCU
Detect circuit realiration), accurate Output optical power is drawn, and first order amplifier is adjusted by the size of input optical power
Control voltage, i.e. AGC functions；When two level is amplified, the radio frequency rf signal currently exported is sampled by MCU (mainly
RF level sensitive circuits are realized), and the control voltage of second level amplifier, i.e. ATT functions are adjusted according to the attenuation of setting.
Whole management type family expenses photoreceiver can be realized carries out compatibility with the ONU of other producers, and receiver and ONU are pacified
In a compact shell, unified fiber entering household scheme is realized, while radio and TV operator can be used up with real time inspection man and be connect
Running parameter (input optical power, output level, the photoreceiver operating temperature, and can be worked in real time according to receiver of receipts machine
State realizes the output level of remote adjustment receiver).Photoreceiver can realize optical receiver module and other by connector
The interaction of module, its interactive information mode have following 3 kinds of modes：UART, I2C and SPI.
The composition of whole management type family expenses photoreceiver is described in detail below：
The present embodiment provides a kind of AGC signal circuits, as shown in Fig. 2 it is mainly by resistance R1, resistance R2, resistance
R3, electric capacity C1, electric capacity C2, amplifier U1, resistance R4, resistance R5, electric capacity C3, electric capacity C4 and amplifier U2 compositions.Resistance R1's
One end connection power supply, the other end pass sequentially through resistance R2, resistance R3 connection amplifiers U1 positive input.Resistance R2, resistance
It is grounded between R3 by electric capacity C1.Amplifier U1 positive input is grounded by electric capacity C2.Resistance R4 and electric capacity C3 are connected in parallel on
Between amplifier U1 itself reverse input end and output end.Amplifier U1 reverse input end is grounded by resistance R5.Amplification
Device U1 output end connection amplifier U2 positive input.Amplifier U2 reverse input end is connected with its output end.Amplification
It is grounded between device U1 output end and amplifier U2 positive input by electric capacity C4.Electric capacity C4 uses variable capacitance.Resistance
MCU AGC control signal outputs, the AGC controls of amplifier U2 output end numerical-control attenuator are connected between R1 and resistance R2
End connection.
Ripple how is reduced in the MCU signals transmissions that AGC signal circuits mainly solve, improves DAC outputs
The problem of responsiveness.It is used for the occasion of DA conversions in PWM, rc filter circuit is the important step of relation conversion effect.By RC
We can substantially calculate the discharge and recharge frequency of capacitance-resistance link to charge and discharge electric constant, be generally and obtained preferable filter effect,
This frequency will be much smaller than PWM output frequency (being less than a quarter).Generally, when the smaller R of C are larger, DA conversions
The voltage loss very little gone out, but ripple is but very big；When the larger R of C are smaller, the voltage loss that DA is changed out is very big, but ripple
It is relatively small.So less filter capacitor must be used when the accurate DA for needing progress Linearity very high is changed, and as far as possible
Avoid using electrolysis class electric capacity.And in order to obtain stronger signal output, it must also add one-level high-performance after RC inertial elements
Voltage follow, the then electrochemical capacitor in the place of follower output plus filtering, for smooth RC inertial elements
Ripple.But this is not enough, because more AC harmonic composition may be contained in output voltage at this moment, if processing is not
When follower is possible to self-excitation.Solution is exactly to use a small decoupling capacitance.And the placement of electric capacity here is sequentially
Must be electrochemical capacitor preceding, decoupling capacitance is rear！If output voltage precision and Linearity are less demanding, but will to ripple
Ask but very high, or when this voltage ratio is more fixed, the larger filtering of electric capacity can be used to combine.Because although bulky capacitor
DC losses are larger, but we can reach the output voltage of requirement by adjusting PWM duty cycle, or pass through one-level AD
The feedback of conversion realizes the output of accurate fixed voltage.Simply still to add voltage order one follower here, in order to rear class
Acquisition Circuit is used, and AD collection points are placed at follower output.
In actual use, arranged in pairs or groups for the ease of circuit, the resistance of second-order low-pass filter and capacitance selection are by we
It is onesize, therefore second-order low-pass filter is as follows by frequency calculation formula：
The AGC signal circuits are tested using oscillograph, its oscillograph test circuit figure is as shown in figure 21, makes
The result for testing to obtain with oscillograph is as shown in figure 22, and as seen from the figure, the circuit is from upper electricity to 95% dutycycle, institute
Time-consuming is 116.923ms, fully meets our application.
The present embodiment provides a kind of ATT signal circuits, and the transmission circuit is similar with AGC transmission circuit structures, and it has
Body structure as shown in figure 3, ATT signal circuits by resistance R6, resistance R7, resistance R8, electric capacity C5, electric capacity C6, amplifier U3,
Resistance R9, resistance R10, electric capacity C7, electric capacity C8 and amplifier U4 compositions.Resistance R6 one end connection power supply, the other end leads to successively
Cross resistance R7, resistance R8 connection amplifiers U3 positive input.It is grounded between resistance R7, resistance R8 by electric capacity C5.Amplification
Device U3 positive input is grounded by electric capacity C6.Resistance R9 and electric capacity C7 be connected in parallel on the amplifier U3 reverse input ends of itself with
Between output end.Amplifier U3 reverse input end is grounded by resistance R10.Amplifier U3 output end connection amplifier U4's
Positive input.Amplifier U4 reverse input end is connected with its output end, output end and the amplifier U4 of the amplifier U3
Positive input between be grounded by electric capacity C8.Electric capacity C8 is variable capacitance.Connect MCU's between resistance R6 and resistance R7
ATT control signal outputs, the ATT control terminals connection of amplifier U4 output end numerical-control attenuator.Due to being transmitted with AGC signals
The structure of circuit is similar, thus the circuit can equally play a part of AGC signal circuits.
Whole management type family expenses photoreceiver removes the circuit structure of MCU parts as shown in figure 4, it is mainly by Power convert
Circuit, system interface, photoelectric switching circuit, light power detection circuit, RF level sensitive circuits figure, one-level amplifying circuit, numerical control
Attenuator, second amplifying circuit and RF signal acquisition circuits composition.
The concrete structure of power-switching circuit as shown in figure 5, its mainly by electric capacity C9, electric capacity C10, electric capacity C11, electric capacity
C12, electric capacity C13, electric capacity C14 compositions.
The concrete structure of system interface as shown in fig. 6, its mainly by ONU (i.e. optical network unit) MCU chip and each
The peripheral circuit of pin is formed.
The concrete structure of photoelectric switching circuit as shown in fig. 7, its mainly by electric capacity C17, resistance capacitance C18, resistance R13,
Resistance R14, inductance L1, PIN photodiode and inductance coil composition.The negative pole of PIN photodiode was both connect by electric capacity C17
Ground, and direct power supply, one end that its positive pole passes through inductance L1 connection inductance coils.The other end of inductance coil passes through resistance R13
Light power detection circuit is connected, the end is also grounded by electric capacity C18, resistance R14 respectively simultaneously.The middle part connection one of inductance coil
Level amplifying circuit.
The concrete structure of light power detection circuit as shown in figure 8, its mainly by resistance R35, amplifier U5, resistance R36, electricity
Hinder R37, resistance R38, resistance R12, electric capacity C15, resistance R11, electric capacity C16 and amplifier U6 compositions.Amplifier U5 output end
Amplified by the OPTIC_ALM interface clock signals of resistance R35 connection system interfaces, positive input by resistance R36 connections
Device U6 output end, reverse input end are grounded by resistance R38.A resistance R37 termination power, other end connection amplifier U5
Reverse input end.Electric capacity C15, resistance R12 are connected in parallel between amplifier U6 itself output end and reverse input end.Amplification
Device U6 reverse input end is grounded by resistance R11.Amplifier U6 positive input is grounded by electric capacity C16, and the end is simultaneously
The resistance R13 of photoelectric switching circuit is also connected to, for reception signal.
The concrete structures of RF level sensitive circuits as shown in figure 9, by electric capacity C40, resistance R33, resistance R32, electric capacity C41,
Chip IC, electric capacity C42 and electric capacity C41 compositions.The pin 1 of chip IC connects signal acquisition circuit, pin 2 is connect by electric capacity C43
Ground, pin 3 are grounded, pin 4 is by the way that electric capacity C42 is grounded, pin 5 is grounded, pin 7 is sequentially connected in series resistance R32 and resistance R33 is followed by
Ground.Electric capacity C41 is connected in parallel on resistance R32 and resistance R33 both ends, and electric capacity C40 is connected in parallel on resistance R33 both ends, resistance R32 and resistance
MCU is connected between R33.
The concrete structure of one-level amplifying circuit is as shown in Figure 10, and it is mainly by electric capacity C19, electric capacity C20, electric capacity C21, amplification
Chip IC 1, inductance L2, electric capacity C23 and resistance R15 compositions.Amplification chip IC1 input is sequentially connected in series electric capacity C20, electric capacity
The middle part of the inductance coil of photoelectric switching circuit after C19.Amplification chip IC1 output end connection numerical-control attenuator, while the end
Power supply is connected after also passing sequentially through inductance L2, resistance R15.It is grounded between inductance L2, resistance R15 by electric capacity C23.
Numerical-control attenuator is mainly made up of AGC modular circuits and ATT modular circuits, and two modular structures are similar.One-level
After amplifying circuit is sequentially connected in series AGC modular circuits and ATT modular circuits, it is connected with second amplifying circuit.Two modules are used respectively
In the AGC control signals and ATT control signals that receive MCU transmissions.The concrete structure of AGC modular circuits, as shown in figure 11, AGC
Modular circuit mainly by electric capacity C25, diode four-tuple D1, inductance L3, electric capacity C24, electric capacity C44, resistance R16, electric capacity C27,
Resistance R20, resistance R17, resistance R18, resistance R19, electric capacity C22, resistance R21, resistance R22, electric capacity C28 and electric capacity C29 compositions.
Electric capacity C25 one end connection one-level amplifying circuit, other end connection diode four-tuple D1 pin 3, the pin 3 pass through resistance
R16 is grounded.The AGC control signal mouths that diode four-tuple D1 pin 2 passes through inductance L3 connections MCU.Inductance L3 and AGC is controlled
It is grounded between signal port by electric capacity C24.Diode four-tuple D1 pin 1 passes through electric capacity C44 connection ATT modular circuits, logical
Cross resistance R22 ground connection.Diode four-tuple D1 pin 4 is grounded by electric capacity C27, while the pin 4 is sequentially connected in series resistance
R20, resistance R18, resistance R17 are followed by power supply, are grounded between resistance R20 and resistance R18 by electric capacity C29, resistance R18 and resistance
It is grounded by resistance R19 between R17, is grounded between resistance R17 and power supply by electric capacity C22.Diode four-tuple D1 pin 5
It is grounded by electric capacity C28, while the pin 5 is connected between resistance R20, resistance R18 by resistance 21.
The concrete structure of ATT modular circuits, as shown in figure 4, mainly by diode four-tuple D2, inductance L4, electric capacity C31,
Electric capacity C35, resistance R23, electric capacity C32, resistance R27, resistance R24, resistance R25, resistance R26, electric capacity R28, resistance R29, electric capacity
C33 and electric capacity C34 compositions.Diode four-tuple D2 pin 3 connects electric capacity C44, and the pin 3 is grounded by resistance R23.Two
The ATT control signal mouths that pole pipe four-tuple D2 pin 2 passes through inductance L4 connections MCU.Between inductance L4 and ATT control signal mouth
It is grounded by electric capacity C31.Diode four-tuple D2 pin 1 by electric capacity C35 connections second amplifying circuit, pass through resistance R29
Ground connection.Diode four-tuple D2 pin 4 is grounded by electric capacity C32, at the same the pin 4 be sequentially connected in series resistance R27, resistance R26,
Resistance R24 is followed by power supply, is grounded between resistance R27 and resistance R26 by electric capacity C33, passes through between resistance R26 and resistance R24
Resistance R25 is grounded, and is grounded between resistance R24 and power supply by electric capacity C22.Diode four-tuple D2 pin 5 passes through electric capacity C34
Ground connection, while the pin 5 is connected between resistance R27, resistance R26 by resistance 28.
The concrete structure of second amplifying circuit is as shown in figure 12, and its structure is similar with one-level amplifying circuit, mainly by amplifying
Chip IC 2, inductance L5, electric capacity C36, electric capacity C30, resistance R30, resistance R31 compositions.Amplification chip IC2 input connection ATT
The electric capacity C35 of modular circuit, the input are grounded after being also sequentially connected in series resistance R30, electric capacity C36.Amplification chip IC2 output end
Connect signal acquisition circuit, while the end also pass sequentially through inductance L5, resistance R31 after connect power supply.Inductance L5, resistance R31 it
Between be grounded by electric capacity C36.It is grounded between resistance R31 and power supply by electric capacity C30.
The concrete structure of RF signal acquisition circuits is as shown in figure 13, and it is by electric capacity C37, chip CX, resistance R34, electric capacity
C39, electric capacity C38 are formed.Electric capacity C37 one end connection second amplifying circuit, other end connection chip CX input, chip CX
Output end pass through electric capacity C38 export RF radiofrequency signals.The IC of chip CX another output end connection RF level sensitive circuits
The pin 1 of chip.
The MCU of family expenses photoreceiver use MINI54ZDE models MCU, as shown in figure 14, also can use 8051, PIC,
Dynamic AGC, ATT function of the realizations such as AVR, Cortex-M0/M0+, Cortex-M3, Cortex-M4.
, it is necessary to build corresponding connection circuit, such as when sampling the MCU of MINI54ZDE models：MCU external clock input
Circuit, see Figure 15, crystal oscillation signal is provided by Y1；MCU reset reset circuit, is shown in Figure 16；MCU system input circuit, is shown in figure
17, the input circuit mainly uses ONU (i.e. optical network unit) MCU；MCU I2C circuits, are shown in Figure 18；MCU ADC signal
Input circuit, see Figure 19, the input circuit is mainly used in signal and the RF level detections that received optical power detection circuit is sent
The signal that circuit is sent；The earthed circuit of MCU ADC signal input interface, is shown in Figure 20.The OPTIC_AGC signal outputs of the MCU
Pin and RF_ATT signal output pins are connected with the AGC modular circuits and ATT modular circuits of numerical-control attenuator respectively.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, it is noted that all
All any modification, equivalent and improvement made within the spirit and principles in the present invention etc., it should be included in the guarantor of the present invention
Within the scope of shield.
Claims (5)
1. a kind of AGC control methods of management type family expenses photoreceiver, it is characterised in that this method comprises the following steps：
(1) MCU is sampled to the luminous power of current input photoreceiver, obtains input optical power values；
(2) tabled look-up according to the input optical power values, find AGC control voltage values；
(3) control voltage of first stage amplifier is adjusted according to the AGC control voltages value, realizes AGC controls；
The specific method that the control voltage of first stage amplifier is adjusted according to the AGC control voltages value is to send out AGC control voltages value
It is sent to the AGC control terminals of numerical-control attenuator；The numerical-control attenuator is mainly made up of AGC modular circuits and ATT modular circuits, AGC
Modular circuit mainly by electric capacity C25, diode four-tuple D1, inductance L3, electric capacity C24, electric capacity C44, resistance R16, electric capacity C27,
Resistance R20, resistance R17, resistance R18, resistance R19, electric capacity C22, resistance R21, resistance R22, electric capacity C28 and electric capacity C29 compositions；
Electric capacity C25 one end connection one-level amplifying circuit, other end connection diode four-tuple D1 pin 3, the pin 3 pass through resistance
R16 is grounded；The AGC control signal mouths that diode four-tuple D1 pin 2 passes through inductance L3 connections MCU；Inductance L3 and AGC is controlled
It is grounded between signal port by electric capacity C24；Diode four-tuple D1 pin 1 passes through electric capacity C44 connection ATT modular circuits, logical
Cross resistance R22 ground connection；Diode four-tuple D1 pin 4 is grounded by electric capacity C27, while the pin 4 is sequentially connected in series resistance
R20, resistance R18, resistance R17 are followed by power supply, are grounded between resistance R20 and resistance R18 by electric capacity C29, resistance R18 and resistance
It is grounded by resistance R19 between R17, is grounded between resistance R17 and power supply by electric capacity C22；Diode four-tuple D1 pin 5
It is grounded by electric capacity C28, while the pin 5 is connected between resistance R20, resistance R18 by resistance 21；ATT modular circuit masters
Will be by diode four-tuple D2, inductance L4, electric capacity C31, electric capacity C35, resistance R23, electric capacity C32, resistance R27, resistance R24, electricity
Hinder R25, resistance R26, electric capacity R28, resistance R29, electric capacity C33 and electric capacity C34 compositions；Diode four-tuple D2 pin 3 connects
Electric capacity C44, the pin 3 are grounded by resistance R23；Diode four-tuple D2 pin 2 is controlled by inductance L4 connections MCU ATT
Signal port processed；It is grounded between inductance L4 and ATT control signal mouth by electric capacity C31；Diode four-tuple D2 pin 1 passes through electricity
Hold C35 connections second amplifying circuit, be grounded by resistance R29；Diode four-tuple D2 pin 4 is grounded by electric capacity C32, together
When the pin 4 be sequentially connected in series resistance R27, resistance R26, resistance R24 and be followed by power supply, pass through electric capacity between resistance R27 and resistance R26
C33 is grounded, and is grounded by resistance R25 between resistance R26 and resistance R24, is grounded between resistance R24 and power supply by electric capacity C22；
Diode four-tuple D2 pin 5 is grounded by electric capacity C34, while the pin 5 is connected to resistance R27, resistance by resistance 28
Between R26；
MCU is sampled to the luminous power of current input photoreceiver, specifically detects the luminous power of photoelectric switching circuit, described
Photoelectric switching circuit is by electric capacity C17, resistance capacitance C18, resistance R13, resistance R14, inductance L1, PIN photodiode and inductance
Coil is formed, and the negative pole of PIN photodiode was both grounded by electric capacity C17, and direct power supply, and its positive pole is connected by inductance L1
One end of inductance coil, the other end of inductance coil pass through resistance R13 connection light power detection circuits, the other end of inductance coil
Also it is grounded respectively by electric capacity C18, resistance R14 simultaneously, the middle part connection one-level amplifying circuit of inductance coil.
A kind of 2. AGC control methods of management type family expenses photoreceiver according to claim 1, it is characterised in that step
(1) circuit used when being sampled include resistance R35, amplifier U5, resistance R36, resistance R37, resistance R38, resistance R12,
Electric capacity C15, resistance R11, electric capacity C16 and amplifier U6, the amplifier U5 positive input pass through resistance R36 connections and amplified
Device U6 output end, reverse input end are grounded by resistance R38, a termination power of the resistance R37, other end connection amplification
Device U5 reverse input end, the electric capacity C15, resistance R12 be connected in parallel on amplifier U6 itself output end and reverse input end it
Between, the reverse input end of the amplifier U6 is grounded by resistance R11, and the positive input of the amplifier U6 passes through electric capacity
C16 is grounded.
3. a kind of AGC control methods of management type family expenses photoreceiver according to claim 2, it is characterised in that described to put
Big device U5 output end passes through resistance R35 connection clock signals.
4. a kind of AGC control methods of management type family expenses photoreceiver according to claim 2, it is characterised in that described to put
Big device U5 positive source termination power supply, power cathode end ground connection.
A kind of 5. AGC control methods of management type family expenses photoreceiver according to claim 1, it is characterised in that step (2)
The table tabled look-up is：
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