CN104506243B - A kind of ATT control circuits of management type family expenses photoreceiver - Google Patents
A kind of ATT control circuits of management type family expenses photoreceiver Download PDFInfo
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- CN104506243B CN104506243B CN201410819892.8A CN201410819892A CN104506243B CN 104506243 B CN104506243 B CN 104506243B CN 201410819892 A CN201410819892 A CN 201410819892A CN 104506243 B CN104506243 B CN 104506243B
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Abstract
The present invention provides a kind of ATT control circuits of management type family expenses photoreceiver, for management type family expenses photoreceiver, the receiver includes connected second amplifying circuit and signal acquisition circuit, the control circuit includes RF level sensitive circuits, MCU and ATT signal circuits, the input of described RF level sensitive circuits is connected with signal acquisition circuit, the output end of RF level sensitive circuits is connected with the RF sampled levels input port of MCU, and the ATT control signal outputs of the MCU are connected by ATT signal circuits with the ATT control ends of numerical-control attenuator.Circuit structure of the invention is simple, low manufacture cost, and may be such that the MCU signal ripples of transmission are lower, and output DAC responsivenesses are more preferable；After the present invention, the input optical power scope of photoreceiver is wider, and with output level higher.
Description
Technical field
The present invention relates to photoreceiver parts, the ATT more particularly, to a kind of management type family expenses photoreceiver controls electricity
Road.
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 more and more fierce, major operators currently or have begun to implement fiber entering household access way, and radio, TV and film industries will
Want that playing an active part in market competition must also realize fiber entering household, 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, not only comprising the data service such as broadband, voice, is more to need for cable television to carry out optical fiber to enter
Family.
Receiver (family expenses photoreceiver) input optical power of current conventional cable television fiber entering household be commonly 0dBm~-
8dBm, output level is 70 ± 2dBuV, however broader input optical power scope can greatly reduce the networking of operator into
This, output level higher can preferably adapt to the use environment of many TVs of current family.It is therefore desirable to develop one kind
Input optical power scope is wider, and with the photoreceiver of output level higher.During new photoreceiver is researched and developed,
ATT controls circuit (automatic growth control) as a kind of important component of photoreceiver, and its structure is also very crucial.
The content of the invention
It is an object of the invention to：For the problem that prior art is present, there is provided a kind of circuit structure is simple, cost of manufacture
It is low, and may be such that the MCU signal ripples of transmission are lower, export the ATT controls of the more preferable management type family expenses photoreceiver of DAC responsivenesses
Circuit processed.
Goal of the invention of the invention is achieved through the following technical solutions：
A kind of ATT control circuits of management type family expenses photoreceiver, for management type family expenses photoreceiver, the receiver bag
Include connected second amplifying circuit and signal acquisition circuit, it is characterised in that the control circuit include RF level sensitive circuits,
MCU and ATT signal circuits, the input of described RF level sensitive circuits is connected with signal acquisition circuit, the inspection of RF level
The output end of slowdown monitoring circuit is connected with the RF sampled levels input port of MCU, and the ATT control signal outputs of the MCU pass through ATT
Signal circuit is connected with the ATT control ends of numerical-control attenuator.
Preferably, the ATT signal circuits include resistance R6, resistance R7, resistance R8, electric capacity C5, electric capacity C6, amplification
Device U3, resistance R9, resistance R10, electric capacity C7, one end connection power supply of electric capacity C8 and amplifier U4, the resistance R6, the other end according to
The secondary positive input that amplifier U3 is connected by resistance R7, resistance R8, is connect between the resistance R7, resistance R8 by electric capacity C5
Ground, the positive input of the amplifier U3 is grounded by electric capacity C6, and the resistance R9 and electric capacity C7 is connected in parallel on amplifier U3 certainly
Between the reverse input end and output end of body, the reverse input end of the amplifier U3 is grounded by resistance R10, the amplifier
The positive input of the output end connection amplifier U4 of U3, the reverse input end of the amplifier U4 is connected with its output end, institute
State and be grounded by electric capacity C8 between the output end of amplifier U3 and the positive input of amplifier U4.
Preferably, the electric capacity C8 is variable capacitance.
Preferably, the RF level sensitive circuits include electric capacity C40, resistance R33, resistance R32, electric capacity C41, chip IC,
Electric capacity C42 and electric capacity C41, the connection of pin 1 signal acquisition circuit of the chip IC, pin 2 are grounded by electric capacity C43, pin 3
Ground connection, pin 4 by electric capacity C42 be grounded, pin 5 is grounded, pin 7 is sequentially connected in series resistance R32 and resistance R33 after ground connection, it is described
Electric capacity C41 is connected in parallel on the two ends of resistance R32 and resistance R33, and electric capacity C40 is connected in parallel on resistance R33 two ends, resistance R32 and resistance R33
Between connect MCU.
Preferably, the MCU uses the MCU of MINI54ZDE models.
Compared with prior art, the present invention has advantages below：
1st, circuit structure is simple, low manufacture cost；
2nd, after using the present invention, the input optical power scope of photoreceiver is wider, and with output level higher；
3rd, can realize being sampled the luminous power of current input by MCU using the present invention, draw accurate output
Luminous power, and the control voltage of first order amplification module is adjusted by the size of input optical power, so that what is exported penetrates
Frequency signal more meets the requirements；
4th, ATT signal circuits, may be such that the MCU signal ripples of transmission are lower, and output DAC responsivenesses are more preferable.
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 the external clock input circuit of MCU；
Figure 16 is the reset reset circuit of MCU；
Figure 17 is the system input circuit of MCU；
Figure 18 is the I2C circuits of MCU；
Figure 19 is the ADC signal input circuit of MCU；
Figure 20 is the earthed circuit of the ADC signal input interface of MCU；
Figure 21 is the oscillograph test circuit figure of AGC signal circuits；
Figure 22 is oscillograph test result figure.
Specific 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 ATT control circuits of management type family expenses photoreceiver, for management type family expenses photoreceiver.
The structure of whole management type family expenses photoreceiver is as shown in figure 1, it is main by connector, photoelectric switching circuit (PIN w/
OWDM), light power detection circuit, MCU, two amplifiers, numerical-control attenuator, RF level sensitive circuits, AGC signal transmissions electricity
Road, ATT signal circuits and signal acquisition circuit composition.
Wherein light power detection circuit, MCU and AGC signal circuits composition AGC control circuit, light power detection circuit
Input be connected with photoelectric switching circuit, the optical power signals input port connection of output end and MCU.The AGC control signals of MCU
Output end is connected by AGC signal circuits with the AGC control ends of numerical-control attenuator.
Wherein RF level sensitive circuits, MCU and ATT signal circuits composition ATT control circuit, RF level sensitive circuits
Input be connected with signal acquisition circuit, the output end of RF level sensitive circuits is connected with the RF sampled levels input port of MCU.
The ATT control signal outputs of MCU are connected by ATT signal circuits with the ATT control ends of 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 amplifying through one-level is sent to numerical-control attenuator, after amplifying through two grades again through the signal after decay, penetrating needed for becoming
Frequency RF signals are simultaneously exported.When the first order is amplified, (mainly luminous power is sampled by MCU to the luminous power of current input
Detection 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 amplifying for two grades, the radio frequency rf signal of current output is sampled (mainly by MCU
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 carrying 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 connecing
Running parameter (input optical power, output level, the photoreceiver operating temperature, and can in real time be worked according to receiver of receipts machine
State realizes the output level of remote adjustment receiver).Photoreceiver can by connector realize optical receiver module and other
The interaction of module, its interactive information mode has following 3 kinds of modes：UART, I2C and SPI.
The composition to 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 main 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 composition.Resistance R1's
One end connection power supply, the other end pass sequentially through the positive input of resistance R2, resistance R3 connection amplifier U1.Resistance R2, resistance
It is grounded by electric capacity C1 between R3.The positive input of amplifier U1 is grounded by electric capacity C2.Resistance R4 and electric capacity C3 are connected in parallel on
Between the reverse input end and output end of amplifier U1 itself.The reverse input end of amplifier U1 is grounded by resistance R5.Amplify
The positive input of the output end connection amplifier U2 of device U1.The reverse input end of amplifier U2 is connected with its output end.Amplify
It is grounded by electric capacity C4 between the output end of device U1 and the positive input of amplifier U2.Electric capacity C4 uses variable capacitance.Resistance
The AGC control signal outputs of MCU, the AGC controls of the output end numerical-control attenuator of amplifier U2 are connected between R1 and resistance R2
End connection.
Ripple how is reduced in the MCU signals transmissions that AGC signal circuits are mainly solved, DAC outputs are improved
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 the output frequency (being less than a quarter) of PWM.Generally, when the smaller R of C are larger, DA conversions
The voltage loss very little for going 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 needing to carry out Linearity accurate DA very high and changing, and as far as possible
Avoid using electrolysis class electric capacity.And in order to obtain stronger signal output, one-level high-performance must also be added after RC inertial elements
Voltage follow, then the place of follower output plus filtering electrochemical capacitor, for smoothing RC inertial elements
Ripple.But this is not enough, because more AC harmonic composition may be contained in output voltage at this moment, if treatment 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 this voltage ratio it is more fixed when, it is possible to use electric capacity it is larger filtering combination.Because, although bulky capacitor
DC losses are larger, but we can reach the output voltage of requirement by adjusting PWM duty cycle, or by 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 and capacitance selection of second-order low-pass filter are by we
It is onesize, therefore second-order low-pass filter is as follows by frequency computing formula：
The AGC signal circuits are tested using oscillograph, its oscillograph test circuit figure as shown in figure 21, makes
The result for obtaining is tested with oscillograph as shown in figure 22, as seen from the figure, the circuit is consumed from upper electricity to 95% dutycycle
Time is 116.923ms, fully meets our range of application.
The present embodiment provides a kind of ATT signal circuits, and the transmission circuit is similar with AGC transmission circuit structures, its tool
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 composition.One end connection power supply of resistance R6, the other end lead to successively
Cross the positive input of resistance R7, resistance R8 connection amplifier U3.It is grounded by electric capacity C5 between resistance R7, resistance R8.Amplify
The positive input of device U3 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.The reverse input end of amplifier U3 is grounded by resistance R10.The output end connection amplifier U4's of amplifier U3
Positive input.The reverse input end of amplifier U4 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 ends connection of the output end numerical-control attenuator of amplifier U4.Due to AGC signal transmissions
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 main 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 is as shown in figure 5, it is main 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 is as shown in fig. 6, its main MCU chip by ONU (i.e. optical network unit) and each
The peripheral circuit of pin is constituted.
The concrete structure of photoelectric switching circuit as shown in fig. 7, its it is main 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 is both connect by electric capacity C17
Ground, and directly power supply, its positive pole connect one end of inductance coil by inductance L1.The other end of inductance coil passes through resistance R13
Connection light power detection circuit, 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 is as shown in figure 8, it is main by resistance R35, amplifier U5, resistance R36, electricity
Resistance R37, resistance R38, resistance R12, electric capacity C15, resistance R11, electric capacity C16 and amplifier U6 compositions.The output end of amplifier U5
Connected by resistance R36 by the OPTIC_ALM interface clock signals of resistance R35 connection system interfaces, positive input and amplified
The output end of device U6, reverse input end are grounded by resistance R38.One termination power of resistance R37, other end connection amplifier U5
Reverse input end.Electric capacity C15, resistance R12 are connected in parallel between the output end of amplifier U6 itself and reverse input end.Amplifier
The reverse input end of U6 is grounded by resistance R11.The positive input of amplifier U6 is grounded by electric capacity C16, and the end is gone back simultaneously
The resistance R13 of photoelectric switching circuit is connected to, for receiving signal.
The concrete structure 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 composition.The connection of pin 1 signal acquisition circuit of chip IC, pin 2 are connect by electric capacity C43
Ground, pin 3 are grounded, pin 4 is grounded by electric capacity C42, 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 the two ends of resistance R32 and resistance R33, and electric capacity C40 is connected in parallel on resistance R33 two ends, resistance R32 and resistance
MCU is connected between R33.
As shown in Figure 10, it is mainly by electric capacity C19, electric capacity C20, electric capacity C21, amplification for the concrete structure of one-level amplifying circuit
Chip IC 1, inductance L2, electric capacity C23 and resistance R15 composition.The input of amplification chip IC1 is sequentially connected in series electric capacity C20, electric capacity
The middle part of the inductance coil of photoelectric switching circuit after C19.The output end connection numerical-control attenuator of amplification chip IC1, while the end
Power supply is connected after also passing sequentially through inductance L2, resistance R15.It is grounded by electric capacity C23 between inductance L2, resistance R15.
Numerical-control attenuator is mainly made up of AGC modular circuits and ATT modular circuits, and two modular structures are similar to.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 it is main 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 composition.
One end of electric capacity C25 connects one-level amplifying circuit, the pin 3 of other end connection diode four-tuple D1, and the pin 3 passes through resistance
R16 is grounded.The pin 2 of diode four-tuple D1 connects the AGC control signals mouthful of MCU by inductance L3.Inductance L3 and AGC is controlled
It is grounded by electric capacity C24 between signal port.The pin 1 of diode four-tuple D1 connects ATT modular circuits, leads to by electric capacity C44
Cross resistance R22 ground connection.The pin 4 of diode four-tuple D1 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 by electric capacity C29 between resistance R20 and resistance R18, resistance R18 and resistance
It is grounded by resistance R19 between R17, is grounded by electric capacity C22 between resistance R17 and power supply.The pin 5 of diode four-tuple D1
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, it is main 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 is constituted.The connection electric capacity C44 of pin 3 of diode four-tuple D2, the pin 3 is grounded by resistance R23.Two poles
The pin 2 of pipe four-tuple D2 connects the ATT control signals mouthful of MCU by inductance L4.Lead between inductance L4 and ATT control signal mouthful
Cross electric capacity C31 ground connection.The pin 1 of diode four-tuple D2 is connected second amplifying circuit, is connect by resistance R29 by electric capacity C35
Ground.The pin 4 of diode four-tuple D2 is grounded by electric capacity C32, while the pin 4 is sequentially connected in series resistance R27, resistance R26, electricity
Resistance R24 is followed by power supply, is grounded by electric capacity C33 between resistance R27 and resistance R26, by electricity between resistance R26 and resistance R24
Resistance R25 ground connection, is grounded between resistance R24 and power supply by electric capacity C22.The pin 5 of diode four-tuple D2 is connect by electric capacity C34
Ground, while the pin 5 is connected between resistance R27, resistance R26 by resistance 28.
As shown in figure 12, its structure is similar with one-level amplifying circuit, mainly by amplifying for the concrete structure of second amplifying circuit
Chip IC 2, inductance L5, electric capacity C36, electric capacity C30, resistance R30, resistance R31 compositions.The input connection of amplification chip IC2
The electric capacity C35 of ATT modular circuits, the input is grounded after being also sequentially connected in series resistance R30, electric capacity C36.Amplification chip IC2's is defeated
Go out end connection signal acquisition circuit, while the end connects power supply after also passing sequentially through inductance L5, resistance R31.Inductance L5, resistance
It is grounded by electric capacity C36 between R31.It is grounded by electric capacity C30 between resistance R31 and power supply.
As shown in figure 13, it is by electric capacity C37, chip CX, resistance R34, electric capacity for the concrete structure of RF signal acquisition circuits
C39, electric capacity C38 are constituted.One end connection second amplifying circuit of electric capacity C37, the input of other end connection chip CX, chip CX
Output end by electric capacity C38 export RF radiofrequency signals.Another output end of chip CX connects the IC of RF level sensitive circuits
The pin 1 of chip.
The MCU of family expenses photoreceiver using MINI54ZDE models MCU, as shown in figure 14, also can using 8051, PIC,
AVR, Cortex-M0/M0+, Cortex-M3, Cortex-M4 etc. realize dynamic AGC, ATT function.
, it is necessary to build corresponding connection circuit during the MCU of MINI54ZDE models of sampling, such as：The external clock input of MCU
Circuit, is shown in Figure 15, and crystal oscillation signal is provided by Y1；The reset reset circuit of MCU, is shown in Figure 16；The system input circuit of MCU, is shown in figure
17, the input circuit is mainly using the MCU of ONU (i.e. optical network unit)；The I2C circuits of MCU, are shown in Figure 18；The ADC signal of MCU
Input circuit, is shown in Figure 19, and the input circuit is mainly used in signal and the RF level detections that received optical power detection circuit sends
The signal that circuit sends；The earthed circuit of the ADC signal input interface of MCU, 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.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is noted that be all
Any modification, equivalent and improvement for being made within the spirit and principles in the present invention etc., should be included in guarantor of the invention
Within the scope of shield.
Claims (4)
1. a kind of ATT of management type family expenses photoreceiver controls circuit, and for management type family expenses photoreceiver, the receiver includes
Connected second amplifying circuit and signal acquisition circuit, it is characterised in that the control circuit includes RF level sensitive circuits, MCU
With ATT signal circuits, the input of described RF level sensitive circuits is connected with signal acquisition circuit, RF level detections electricity
The output end on road is connected with the RF sampled levels input port of MCU, and the ATT control signal outputs of the MCU are passed by ATT signals
Transmission of electricity road is connected with the ATT control ends of numerical-control attenuator, and the ATT signal circuits include 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, the resistance R6's
One end connection power supply, the other end pass sequentially through the positive input of resistance R7, resistance R8 connection amplifier U3, the resistance R7,
Be grounded by electric capacity C5 between resistance R8, the positive input of the amplifier U3 is grounded by electric capacity C6, the resistance R9 and
Electric capacity C7 is connected in parallel between the reverse input end of amplifier U3 itself and output end, and the reverse input end of the amplifier U3 passes through
Resistance R10 is grounded, the positive input of the output end connection amplifier U4 of the amplifier U3, and the amplifier U4's is reverse defeated
Enter end to be connected with its output end, connect by electric capacity C8 between the output end of the amplifier U3 and the positive input of amplifier U4
Ground；
Numerical-control attenuator is mainly made up of AGC modular circuits and ATT modular circuits, and AGC modular circuits are main by electric capacity C25, two
Pole pipe 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 composition；One end connection one-level of electric capacity C25 is put
The pin 3 of big circuit, other end connection diode four-tuple D1, the pin 3 is grounded by resistance R16；Diode four-tuple D1
Pin 2 the AGC control signals mouthful of MCU are connected by inductance L3；Pass through electric capacity C24 between inductance L3 and AGC control signal mouthful
Ground connection；The pin 1 of diode four-tuple D1 is connected ATT modular circuits, is grounded by resistance R22 by electric capacity C44；Diode four
The pin 4 of tuple D1 is grounded by electric capacity C27, while the pin 4 is sequentially connected in series resistance R20, resistance R18, resistance R17 is followed by electricity
Source, is grounded between resistance R20 and resistance R18 by electric capacity C29, is grounded by resistance R19 between resistance R18 and resistance R17, electricity
It is grounded by electric capacity C22 between resistance R17 and power supply；The pin 5 of diode four-tuple D1 is grounded by electric capacity C28, while this draws
Pin 5 is connected between resistance R20, resistance R18 by resistance 21；ATT modular circuits are main 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, electricity
Resistance R29, electric capacity C33 and electric capacity C34 compositions；The connection electric capacity C44 of pin 3 of diode four-tuple D2, the pin 3 passes through resistance
R23 is grounded；The pin 2 of diode four-tuple D2 connects the ATT control signals mouthful of MCU by inductance L4；Inductance L4 and ATT is controlled
It is grounded by electric capacity C31 between signal port；The pin 1 of diode four-tuple D2 connects second amplifying circuit, leads to by electric capacity C35
Cross resistance R29 ground connection；The pin 4 of diode four-tuple D2 is grounded by electric capacity C32, while the pin 4 is sequentially connected in series resistance
R27, resistance R26, resistance R24 are followed by power supply, are grounded by electric capacity C33 between resistance R27 and resistance R26, resistance R26 and resistance
It is grounded by resistance R25 between R24, is grounded by electric capacity C22 between resistance R24 and power supply；The pin 5 of diode four-tuple D2
It is grounded by electric capacity C34, while the pin 5 is connected between resistance R27, resistance R26 by resistance 28.
2. a kind of ATT of management type family expenses photoreceiver according to claim 1 controls circuit, it is characterised in that described
Electric capacity C8 is variable capacitance.
3. a kind of ATT of management type family expenses photoreceiver according to claim 1 controls circuit, it is characterised in that described
RF level sensitive circuits include electric capacity C40, resistance R33, resistance R32, electric capacity C41, chip IC, electric capacity C42 and electric capacity C41, institute
State the connection of pin 1 signal acquisition circuit of chip IC, pin 2 is grounded by electric capacity C43, pin 3 is grounded, pin 4 passes through electric capacity
C42 ground connection, pin 5 is grounded, pin 7 is sequentially connected in series resistance R32 and resistance R33 after be grounded, the electric capacity C41 is connected in parallel on resistance
The two ends of R32 and resistance R33, electric capacity C40 is connected in parallel on resistance R33 two ends, and MCU is connected between resistance R32 and resistance R33.
4. a kind of ATT of management type family expenses photoreceiver according to claim 1 controls circuit, it is characterised in that described
MCU uses the MCU of MINI54ZDE models.
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| CN104506243B true CN104506243B (en) | 2017-06-30 |
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| CN106210839B (en) * | 2016-07-25 | 2019-12-10 | 青岛海信宽带多媒体技术有限公司 | automatic gain control system and method for set top box |
| CN109283594A (en) * | 2018-11-12 | 2019-01-29 | 广东浩喜电器科技有限公司 | A kind of liquid-detecting and its detection method |
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| CN203086448U (en) * | 2013-01-31 | 2013-07-24 | 合肥钦力电子有限公司 | Novel DAC circuit used for microcontroller |
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| JP2007124375A (en) * | 2005-10-28 | 2007-05-17 | Stack Denshi Kk | Light receiving circuit and optical transmission system |
| CN101385263A (en) * | 2006-02-15 | 2009-03-11 | 科学-亚特兰大股份有限公司 | Fiber-to-the-home (ftth) optical receiver with distributed gain control |
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| CN104506243A (en) | 2015-04-08 |
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