CN108282231A - A kind of small-sized FTTH photoreceivers hardware circuit - Google Patents
A kind of small-sized FTTH photoreceivers hardware circuit Download PDFInfo
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- CN108282231A CN108282231A CN201810025161.4A CN201810025161A CN108282231A CN 108282231 A CN108282231 A CN 108282231A CN 201810025161 A CN201810025161 A CN 201810025161A CN 108282231 A CN108282231 A CN 108282231A
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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
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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
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Abstract
The present invention provides a kind of small-sized FTTH photoreceivers hardware circuits, including photoelectric switching circuit, first order amplifying circuit, adjustable damping circuit, AGC calculating control circuits, second level amplifying circuit.Photoelectric switching circuit, first order amplifying circuit, adjustable damping circuit, second level amplifying circuit are sequentially connected with, and AGC calculating control circuits are connect with photoelectric switching circuit, adjustable damping circuit.The present invention be aim at catv network FTTH application and design the small receiver of domestic type, it is received with height sensitive, low noise, exchange power consumption is less than 0.5W, super low-power consumption, the small feature of the distortion factor, is capable of providing stable output level and excellent performance indicator under the up to bandwidth of 1000Mhz, has extremely wide luminous power working range.The receiver has stable agc circuit, is used for user terminal and provides stable signal.
Description
Technical field
The invention belongs to FTTH web-transporting devices field more particularly to a kind of small-sized FTTH optical receiver circuits.
Background technology
With the development of science and technology and society, the communication technology is in the daily production and living of people in occupation of more and more important
Status, and in numerous communication technologys, FTTH（Fiber ToThe Home）The fiber information transmission important as one of which
Technology gradually earns widespread respect in current economic society.FTTH, i.e. fiber to the home refer to complete between local side and user
A kind of data transfer means using optical fiber as transmission media entirely, its appearance are science and technology and the inevitable outcome of social development.
Fiber to the home（FTTH）The final developing direction of network access technique, FTTH ONT Optical Network Terminals be receive CATV or
IPQAM signals and broadband network transmit the terminal device being integrated.With the further development of light entering and copper back trend, fiber plant
It will gradual scale application.With the fiber-to-the-home universal integration with circuit, the type of fiber to the home equipment is also got over
Carry out more household, volume is also smaller and smaller.There are some defects in use in existing photoreceiver.Such as photoreceiver
The calorific value that works long hours is big, and for power consumption height generally in 2W-3W, the unstable amplitude of variation of level signal of user terminal is big, influences to use
The usage experience at family.
Invention content
To solve the above problems, the present invention provides a kind of small-sized FTTH photoreceivers hardware circuit, including opto-electronic conversion
Circuit, first order amplifying circuit, adjustable damping circuit, AGC calculating control circuits, second level amplifying circuit；
Photoelectric switching circuit, first order amplifying circuit, adjustable damping circuit, second level amplifying circuit are sequentially connected with, and AGC calculates control
Circuit processed is connect with photoelectric switching circuit, adjustable damping circuit.
The photoelectric switching circuit is for converting optical signals to radiofrequency signal；It includes photodetector, the 13rd electricity
Resistance, the 14th resistance, the 15th resistance, the second capacitance, the 18th capacitance, the 19th capacitance, the 20th capacitance, the 25th electricity
Appearance, the first inductance, the second inductance, radio-frequency transformer；Their connection relation is：Photodetector second pin connects 5V power supplies,
And the 25th capacitance one end is connect, another end feet ground connection of the 25th capacitance constitutes filter circuit, and photodetector third is drawn
Foot is grounded, and the first pin of photodetector connects first inductance one end, the first pin of another termination radio-frequency transformer of the first inductance,
The second pin of radio-frequency transformer connects thirteenth resistor one end, one end of the 14th resistance of another termination of thirteenth resistor and
Another end feet ground connection of one end of 18 capacitances, the other end of the 14th resistance and the 18th capacitance, thirteenth resistor it is another
Terminate one end of the 15th resistance, another end feet of the 15th resistance connect one end of the 19th capacitance, the 20th capacitance one end
And an input terminal of the No.1 operational amplifier of amplifier integrated package, the other end of the 19th capacitance and the 20th capacitance it is another
End ground connection；The third pin of radio-frequency transformer connects one end of one end and the first capacitance of the second capacitance, the other end of the first capacitance
Ground connection, one end of one end and third capacitance of the second inductance of another termination of the second capacitance, the other end ground connection of third capacitance will
It converts matched signal and is sent into first order amplifying circuit.
First order amplifying circuit is for the radiofrequency signal that photoelectric switching circuit exports to be amplified；It includes low noises to penetrate
Frequency amplifier tube, first resistor, second resistance, the 4th capacitance, third inductance, the 4th inductance, the 5th inductance, the 5th capacitance；They
Connection relation be：First pin of low noise radio frequency amplifier tube connects the other end of the second inductance, low noise radio frequency amplifier tube
Third pin is grounded, and second pin connects one end of one end and third inductance of second resistance as output pin, second resistance it is another
One end is connect after being sequentially connected with the 4th capacitance, the 4th inductance, first resistor with the second inductance other end；The other end of third inductance
The 6th capacitance one end is connect, and connects one end of the 6th inductance, one end ground connection of the 5th capacitance is another to terminate the another of the 6th inductance
End and 5V power supplys.
Adjustable damping circuit be used for optical signal input variation when, ensure output power change in a certain range,
It includes the 6th capacitance, the 7th capacitance, 3rd resistor, the 4th resistance, the 5th resistance, the second radio frequency attenuator, the 6th resistance,
Seven resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor, the 8th capacitance, the 9th capacitance,
Ten capacitances, the 11st capacitance, the 12nd capacitance, the 13rd capacitance, the 14th capacitance；Their connection relation is：6th capacitance
Another termination 3rd resistor one end and the 4th resistance one end, the other end of 3rd resistor connects the 5th resistance one end and the
Seven capacitance one end；The 4th resistance other end is connect with the 5th resistance other end, and tie point is grounded；The of second radio frequency attenuator
One pin connects the other end of the 7th capacitance and one end of the 6th resistance, and the second pin of the second radio frequency attenuator connects the 5th inductance
One end, third pin connect one end of one end and the 9th capacitance of the 7th resistance, the other end ground connection of the 7th resistance, the 5th inductance
The other end connection amplifier integrated package No. two operational amplifiers output end；The other end of 6th resistance is grounded；Second radio frequency
4th pin of attenuator connects one end of the 8th resistance, and is grounded after being also connected with the 8th capacitance；5th pin connects the 9th resistance
One end, and be grounded after being also connected with the tenth capacitance；Another end feet of 8th resistance connects the other end of the 9th resistance, and is connected to the tenth
One capacitance；The other end of 9th resistance is grounded after being also connected with the 12nd capacitance, is grounded after connecting the 14th capacitance, and be also connected to
The other end of one end of eleventh resistor, eleventh resistor is connected to the tenth resistance one end, and the other end of the tenth resistance is connected to
5V power supplys；13rd capacitance one end is connected with twelfth resistor one end, and tie point is connected to eleventh resistor and the tenth resistance
Tie point；The 13rd capacitance other end and twelfth resistor other end ground connection.
AGC calculating control circuits are used to control the work of adjustable damping circuit comprising the 16th resistance, the 17th electricity
Resistance, the 18th resistance, the 20th resistance, the 21st resistance, the 22nd resistance, the 23rd resistance, the 22nd capacitance,
23rd capacitance, the 24th capacitance, amplifier integrated package, MCU chip, their connection relation are：16th resistance one end
Ground connection, the other end are sequentially connected with the 17th resistance, the 18th resistance, and the 16th resistance is connect with the tie point of the 17th resistance
To an input terminal of amplifier integrated package No.1 operational amplifier, the tie point of the 17th resistance and the 18th resistance is connected to fortune
The output end of the No.1 operational amplifier of integrated package is put, another input terminal of No.1 operational amplifier is connected to the 15th resistance
The other end and the 19th capacitance tie point;Other two pin of No.1 operational amplifier is grounded, connects 5V power supplys respectively;
The other end of 18th resistance is connected to the 20th pin of MCU chip；14th pin of MCU chip connects 5V power supplys and the 26th
One end of capacitance, the other end ground connection of the 26th capacitance；5th pin of MCU chip is grounded；One termination of the 19th resistance
4th pin of MCU chip, the other end connect one end of one end and the 21st capacitance of the 20th resistance, the 20th resistance
The other end of the other end and the 21st capacitance is grounded;First pin of MCU chip connects an end feet of the 21st resistance, and second
One end of one end and the 22nd capacitance of the 22nd resistance of another termination of 11 resistance, the other end of the 22nd resistance
Connect one end of one end and the 23rd capacitance of the 23rd resistance, the other end of the 22nd capacitance and the 23rd capacitance
The other end is grounded；24th capacitance one end is grounded, and the other end is connected to one of No. two operational amplifiers of amplifier integrated package
Input terminal, the output end of No. two operational amplifiers is connected to the other end of the 5th inductance, and is connect with another input terminal.
Second level amplifying circuit is for the output signal of adjustable damping circuit to be amplified, and output end is as entire electricity
The output end on road；It includes third low noise radio frequency amplifier tube, the 6th inductance, the 7th inductance, the 15th capacitance, the 16th electricity
Hold, the 17th capacitance;Their connection relation is：The other end of 9th capacitance is connected to the of third low noise radio frequency amplifier tube
One pin（Input terminal）, one end of second pin (output end) the 6th inductance of connection, third pin ground connection；6th inductance it is another
One end of the 7th inductance of end connection and one end of the 15th capacitance；One end of 16th capacitance is connected to the another of the 7th inductance
End, and 5V power supplys are connected to, other end ground connection；The other end of 15th capacitance is connected to one end of the 17th capacitance, and the 17th
The other end of capacitance is radio frequency delivery outlet.
The control range of AGC calculating control circuits is that -5dBm arrives -15dBm.
Second level amplifying circuit further includes the first radio frequency protection pipe, the second radio frequency protection pipe；The other end of 15th capacitance
The third pin of the first radio frequency protection pipe is connected, the second pin of the first radio frequency protection pipe connects the first of the second radio frequency protection pipe and draws
Foot, the first pin connect the second pin of the second radio frequency protection pipe, the third pin ground connection of the second radio frequency protection.
Beneficial effects of the present invention are：
The invention discloses a kind of FTTH optical receiver circuits, be aim at catv network FTTH application and design domestic type it is small
There is receiver sensitive, the low noise of high reception, exchange power consumption to be less than 0.5W, super low-power consumption, the small feature of the distortion factor, up to
It is capable of providing stable output level and excellent performance indicator under the bandwidth of 1000Mhz, there is extremely wide luminous power work model
It encloses.The receiver has stable agc circuit, is used for user terminal and provides stable signal.
Description of the drawings
Fig. 1 is a kind of FTTH optical receiver circuits schematic diagram of the present invention.
Specific implementation mode
As shown in Figure 1, a kind of FTTH optical receiver circuits, including photoelectric switching circuit, first order amplifying circuit, adjustable declining
Powered down road, AGC calculating control circuits, second level amplifying circuit.Photoelectric switching circuit, first order amplifying circuit, adjustable damping electricity
Road, second level amplifying circuit are sequentially connected with, and AGC calculating control circuits are connect with photoelectric switching circuit, adjustable damping circuit.
It is introduced separately below.
One, photoelectric switching circuit
The optical signal modulated is mainly converted to radiofrequency signal by photoelectric switching circuit, and photoelectric switching circuit includes photoelectricity
Detector PIN（Optical signal switchs to electric signal）, radio-frequency transformer CX1, thirteenth resistor R13, the 14th resistance R14, the 15th
Resistance R15, the second capacitance C2, the 18th capacitance C18, the 19th capacitance C19, the 20th capacitance C20, the 25th capacitance
C25, the first inductance L1, the second inductance L2, radio-frequency transformer CX1.Photodetector PIN is the master that optical signal is switched to electric signal
It is mainly the simple filtering of PIN cathode power supply to want device, the 25th capacitance C25, and the first inductance L1 and radio-frequency transformer CX1 is
It is used with circuit, has higher efficiency of transmission, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 18th
The optical detection circuit of capacitance C18, the 19th capacitance C19, the 18th capacitance C18 compositions, ginseng is provided to calculate AGC control circuits
Examine calculating.
Two, first order amplifying circuit
The switched radiofrequency signal of photoelectric switching circuit is amplified by first order amplifying circuit, and first order signal need to use low noise
The amplifying circuit of sound, to ensure that the signal-to-noise ratio of entire circuit, first order amplifying circuit include low noise radio frequency amplifier tube U1, first
Resistance R1, second resistance R2, the 4th capacitance C4, third inductance L3, the 4th inductance L4, the 5th inductance L5, the 5th capacitance C5,
In, first resistor R1, second resistance R2, the 4th capacitance C4, third inductance L3, the 4th inductance L4, the 5th inductance L5 are low noise
The peripheral structure of radio frequency amplifier tube U1, the 5th capacitance C5 are that U1 power supply filtering is used.
Three, adjustable damping circuit
Adjustable damping circuit function is in the input variation of optical signal, in the control attenuator circuit of AGC, to ensure the work(of output
Rate changes in a certain range.Including the 6th capacitance C6, the 7th capacitance C7,3rd resistor R3, the 4th resistance R4, the 5th resistance
R5, the second radio frequency attenuator U2, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10
, eleventh resistor R11, twelfth resistor R12, the 8th capacitance C8, the 9th capacitance C9, the tenth capacitance C10, the 11st capacitance
C11, the 12nd capacitance C12, the 13rd capacitance C13, the 14th capacitance C14, AGC voltages are penetrated by the 5th inductance L5 controls second
Frequency attenuator U2.
Four, AGC calculating control circuits
AGC calculating control circuits are used to control the work of adjustable damping circuit comprising the 16th resistance R16, the 17th resistance
R17, the 18th resistance R18, the 20th resistance R20, the 21st resistance R21, the 22nd resistance R22, the 23rd resistance
R3, the 22nd capacitance C22, the 23rd capacitance C23, the 24th capacitance C24, amplifier integrated package U5（U5A in figure,
U5B）, MCU chip U4.The circuit is the optical power signals that will be acquired, and exports the second radio frequency attenuator U2's of control by calculating
Voltage signal, luminous power detection signal are sent into amplifier integrated package U5 through being calculated in amplification filtering feeding MCU chip U4, are exported
AGC controls signal and passes through integrating circuit（By the 21st resistance R21, the 22nd resistance R22, the 23rd resistance R23,
22 capacitance C22, the 23rd capacitance C23, the 24th capacitance C24 are constituted）, amplifier integrated package U5 is output to by
Five inductance L5 control the attenuation of the second radio frequency attenuator U2.
Five, second level amplifying circuit
Second level amplifying circuit is that first order RF signal strength is further amplified, to meet the level for being output to set-top box
Signal is met the requirements, including third low noise radio frequency amplifier tube, six inductance L6, the 7th inductance L7, the 15th capacitance C15, the tenth
Six capacitance C16, the 17th capacitance C17;6th inductance L6, the 7th inductance L7, the 15th capacitance C15, the 16th capacitance C16,
17 capacitance C17 are peripheral power supply circuit.Preferably, further include the first radio frequency protection pipe Q1, the second radio frequency protection pipe Q2.Tenth
The other end of five capacitance C15 connects the third pin of the first radio frequency protection pipe Q1, and the second pin of the first radio frequency protection pipe Q1 connects
The first pin of second radio frequency protection pipe Q2, the first pin connect the second pin of the second radio frequency protection pipe Q2, the protection of the second radio frequency
The third pin of pipe Q2 is grounded.First radio frequency protection pipe Q1, the first radio frequency protection pipe Q2 are circuit protection diode, prevent moment
The excessive damage circuit structure of signal.
The connection relation of entire circuit is illustrated below.
Photodetector PIN second pins（Cathode）5V power supplies are connect, and meet the 25th capacitance C25（10uF）One end, the
Another end feet ground connection of 25 capacitance C25 constitutes filter circuit, photodetector PIN third pins ground connection, photodetector
The first pins of PIN connect first one end inductance L1, the first pin of another termination radio-frequency transformer CX1 of the first inductance L1, and radio frequency becomes
The second pin of depressor CX1 connects the one end thirteenth resistor R13, the 14th resistance R14's of another termination of thirteenth resistor R13
One end of one end and the 18th capacitance C18, the 14th resistance R14（1K）The other end and the 18th capacitance C18（10uF）It is another
One end feet is grounded, the 15th resistance R15 of another termination of thirteenth resistor R13（10k）One end, the 15th resistance R15's is another
One end feet meets the 19th capacitance C19（10uF）One end, the 20th capacitance C20（10uF）One end and amplifier integrated package U5 one
An input terminal of number operational amplifier U5A, the 19th capacitance C19（10uF）The other end and the 20th capacitance C20 it is another
End ground connection.Photodetector PIN detection change in optical signal is that MCU chip U4 transmits data.
The third pin of radio-frequency transformer CX1 connects one end of one end and the first capacitance C1 of the second capacitance C2 (10uF), the
One capacitance C1（0.5pF）The other end ground connection, the second inductance of another termination L2 of the second capacitance C2（3.3nH）One end and third
One end of capacitance C3, the other end ground connection of third capacitance C3, will convert matched signal and be sent into first order amplifying circuit.
The first pin of low noise radio frequency amplifier tube U1（Input terminal）The other end of the second inductance L2 is connect, low noise radio frequency is put
The third pin ground connection of big pipe U1, second pin meet second resistance R2 as output pin（820Ω）One end and third inductance L3
One end, the other end of second resistance R2 is sequentially connected with after the 4th capacitance C4, the 4th inductance L4, first resistor R1 and the second inductance
The L2 other ends connect；The 6th one end capacitance C6 of another termination of third inductance L3, and one end of the 6th inductance L6 is connected, the 5th electricity
Hold one end ground connection of C5 (10uF), the other end and 5V power supplys of the 6th inductance L6 of another termination.
Another termination 3rd resistor R3 (36 Ω of 6th capacitance C6）One end and the 4th resistance R4（360Ω）One end,
The other end of 3rd resistor R3 connects the 5th resistance R5（360Ω）One end and the 7th capacitance C7 (10uF）One end；4th resistance is another
One end is connect with the 5th resistance other end, and tie point is grounded.
The first pin of second radio frequency attenuator U2 connects the other end and the 6th resistance R6 (560 Ω of the 7th capacitance C7）One end,
The second pin of second radio frequency attenuator U2 meets the 5th inductance L5 (1uH）One end, third pin connect the 7th resistance R7 one
The one end at end and the 9th capacitance C9, the 7th resistance R7 (560 Ω）Other end ground connection, the other end of the 5th inductance L5 connects amplifier
The output end of No. two operational amplifier U5B of integrated package U5；The other end of 6th resistance R6 is grounded；Second radio frequency attenuator U2's
4th pin meets the 8th resistance R8（560Ω）One end, and be also connected with the 8th capacitance C8（10uF）After be grounded；5th pin connects
Nine resistance R9（560Ω）One end, and be also connected with the tenth capacitance C10 (10uF) and be grounded afterwards；Another end feet of 8th resistance R8
The other end of the 9th resistance R9 is connect, and is connected to the 11st capacitance C11（10uF）.The other end of 9th resistance R9 is also connected with the tenth
Two capacitance C12（10uF）After be grounded, connect the 14th capacitance C14（10uF）After be grounded, and be also connected to eleventh resistor R11's
The other end of one end, eleventh resistor R11 is connected to the tenth one end resistance R10, and the other end of the tenth resistance R10 is connected to 5V electricity
Source；13rd one end capacitance C13 is connected with the one end twelfth resistor R12, and tie point is connected to eleventh resistor R11 and the tenth
The tie point of resistance R10；The 13rd capacitance C13 other ends and twelfth resistor R12 other ends ground connection.
16th one end resistance R16 is grounded, and the other end is sequentially connected with the 17th resistance R17, the 18th resistance R18, the
The tie point of 16 resistance R16 and the 17th resistance R17 be connected to amplifier integrated package U5 No.1 operational amplifiers U5A one is defeated
Enter to hold, the tie point of the 17th resistance R17 and the 18th resistance R18 are connected to the No.1 operational amplifier of amplifier integrated package U5
Another input terminal of the output end of U5A, No.1 operational amplifier U5A is connected to the other end and the tenth of the 15th resistance R15
Nine capacitance C19（10uF）Tie point;Other two pin of No.1 operational amplifier U5A is grounded, connects 5V power supplys respectively;The
The other end of 18 resistance R18 is connected to the 20th pin of MCU chip U4；14 feet of MCU chip U4 connect 5V power supplys and the 20th
Six capacitance C26 (10uF）One end, the 26th capacitance C26 the other end ground connection；The 5th pin of MCU chip U4 is grounded；The
The 4th pin of a termination MCU chip U4 of 19 resistance R19, the other end connect one end and the 20th of the 20th resistance R20
One end of one capacitance C21, the other end of the 20th resistance R20 and the other end ground connection of the 21st capacitance C21.
The 7th, 8,9,10,12,13,16,17,18,19 pin of MCU chip U4 is hanging, does not connect.
The first pin of MCU chip U4 meets the 21st resistance R21（1kΩ）An end feet, the 21st R21's is another
Terminate the 22nd resistance R22（1kΩ）One end and the 22nd capacitance C22 one end, the 22nd resistance R22's is another
Terminate the 23rd resistance R23（1kΩ）One end and the 23rd capacitance C23 one end, the 22nd capacitance C22's is another
The other end of end and the 23rd capacitance C23 are grounded；24th one end capacitance C24 is grounded, and it is integrated that the other end is connected to amplifier
An input terminal of No. two operational amplifier U5B of block U5, the output end of No. two operational amplifier U5B are connected to the 5th inductance L5
The other end, and connect with another input terminal.
The other end of 9th capacitance C9 is connected to the first pin of third low noise radio frequency amplifier tube U3（Input terminal）, second
Pin (output end) connects one end of the 6th inductance L6 (3.3nH), third pin ground connection；The other end connection the of 6th inductance L6
Seven inductance L7 (1uH）One end and the 15th capacitance C15 one end；One end of 16th capacitance C16 (10uF) is connected to the 7th
The other end of inductance L7, and 5V power supplys are connected to, other end ground connection；The other end of 15th capacitance C15 is connected to the 17th electricity
Hold one end of C17, the other end of the 17th capacitance C17 is radio frequency delivery outlet.Preferably, further include the first radio frequency protection pipe Q1,
Second radio frequency protection pipe Q2；The other end of 15th capacitance C15 connects the third pin of the first radio frequency protection pipe Q1, the first radio frequency
The second pin of protection pipe Q1 connects the first pin of the second radio frequency protection pipe Q2, and the first pin connects the of the second radio frequency protection pipe Q2
Two pins, the third pin ground connection of the second radio frequency protection pipe Q2.
The present invention the course of work be：
Its operation principle is as follows:Photodetector PIN and low noise radio frequency amplifier tube U1 constitutes optical detection grade by CATV
（Community Antenna Television, broadcasting and TV cable television system）1550nm optical signals be converted to electric signal, just
The radiofrequency signal exported when often, by R3, the impedance of R4, R5 composition is through VCA (electrically controlled attenuator)（By inductance L5, resistance R6,
R7, R8, R9, R10, R11, R12, capacitance C7, C8, C9, C10, C11, C12, C13, C14, the second radio frequency attenuator U2 compositions
Electrically controlled attenuator）Regulation and control；
It is sent into MCU chip U4's after amplifier amplification detection signal by the light signal strength of photodetector PIN detection inputs
Test side, the control range -5dBm Dao -15dBm of AGC calculate accurate corresponding control voltage, control VCA（Electricity adjusts decaying
Device）Attenuation, make output level keep stablize, level signal export integrating circuit, be re-fed into amplifier（Follower）, it is re-fed into
VCA (electrically controlled attenuator) regulates and controls, and ensures the stabilizing output level output of the variation of input optical signal and receiver with this.
Second amplifying circuit is output signals to through VCA (electrically controlled attenuator) regulation and control, it is preferred that the amplifier in the second level
Delivery outlet connects protection diode, prevents the signal corruption circuit block that moment is excessive, ensures stable work.
Claims (3)
1. a kind of small-sized FTTH photoreceivers hardware circuit, which is characterized in that including photoelectric switching circuit, first order amplification electricity
Road, adjustable damping circuit, AGC calculating control circuits, second level amplifying circuit；
Photoelectric switching circuit, first order amplifying circuit, adjustable damping circuit, second level amplifying circuit are sequentially connected with, and AGC calculates control
Circuit processed is connect with photoelectric switching circuit, adjustable damping circuit；
The photoelectric switching circuit is for converting optical signals to radiofrequency signal；It includes photodetector, thirteenth resistor,
14 resistance, the 15th resistance, the second capacitance, the 18th capacitance, the 19th capacitance, the 20th capacitance, the 25th capacitance,
One inductance, the second inductance, radio-frequency transformer；Their connection relation is：Photodetector second pin connects 5V power supplies, and connects the
Another end feet ground connection of 25 capacitance one end, the 25th capacitance constitutes filter circuit, and photodetector third pin is grounded,
The first pin of photodetector connects first inductance one end, the first pin of another termination radio-frequency transformer of the first inductance, and radio frequency becomes
The second pin of depressor connects thirteenth resistor one end, one end of the 14th resistance of another termination of thirteenth resistor and the 18th electricity
Another end feet ground connection of one end of appearance, the other end of the 14th resistance and the 18th capacitance, another termination of thirteenth resistor the
Another end feet of one end of 15 resistance, the 15th resistance connects one end of the 19th capacitance, one end of the 20th capacitance and amplifier
One input terminal of the No.1 operational amplifier of integrated package, another termination of the other end and the 20th capacitance of the 19th capacitance
Ground；The third pin of radio-frequency transformer connects one end of one end and the first capacitance of the second capacitance, and the other end of the first capacitance is grounded,
One end of one end and third capacitance of the second inductance of another termination of the second capacitance, the other end ground connection of third capacitance, will convert
Matched signal is sent into first order amplifying circuit；
First order amplifying circuit is for the radiofrequency signal that photoelectric switching circuit exports to be amplified；It includes low noise radio frequencies
Amplifier tube, first resistor, second resistance, the 4th capacitance, third inductance, the 4th inductance, the 5th inductance, the 5th capacitance；They
Connection relation is：First pin of low noise radio frequency amplifier tube connects the other end of the second inductance, and the of low noise radio frequency amplifier tube
Three pins are grounded, and second pin connects one end of one end and third inductance of second resistance as output pin, second resistance it is another
End is connect after being sequentially connected with the 4th capacitance, the 4th inductance, first resistor with the second inductance other end；Another termination of third inductance
6th capacitance one end, and one end of the 6th inductance is connected, one end ground connection of the 5th capacitance, the other end of the 6th inductance of another termination
And 5V power supplys；
Adjustable damping circuit is used to, in the input variation of optical signal, ensure that the power of output changes in a certain range, wrap
Include the 6th capacitance, the 7th capacitance, 3rd resistor, the 4th resistance, the 5th resistance, the second radio frequency attenuator, the 6th resistance, the 7th electricity
Resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor, the 8th capacitance, the 9th capacitance, the tenth electricity
Appearance, the 11st capacitance, the 12nd capacitance, the 13rd capacitance, the 14th capacitance；Their connection relation is：6th capacitance it is another
The other end of one end of one end and the 4th resistance of one termination 3rd resistor, 3rd resistor connects the 5th resistance one end and the 7th electricity
Hold one end；The 4th resistance other end is connect with the 5th resistance other end, and tie point is grounded；The first of second radio frequency attenuator is drawn
Foot connects the other end of the 7th capacitance and one end of the 6th resistance, and the second pin of the second radio frequency attenuator connects the one of the 5th inductance
End, third pin connect one end of one end and the 9th capacitance of the 7th resistance, and the other end of the 7th resistance is grounded, the 5th inductance
The other end connects the output end of No. two operational amplifiers of amplifier integrated package；The other end of 6th resistance is grounded；Second radio frequency declines
The 4th pin for subtracting device connects one end of the 8th resistance, and is grounded after being also connected with the 8th capacitance；5th pin connects the one of the 9th resistance
End, and be grounded after being also connected with the tenth capacitance；Another end feet of 8th resistance connects the other end of the 9th resistance, and is connected to the 11st
Capacitance；The other end of 9th resistance is grounded after being also connected with the 12nd capacitance, is grounded after connecting the 14th capacitance, and is also connected to the
The other end of one end of 11 resistance, eleventh resistor is connected to the tenth resistance one end, and the other end of the tenth resistance is connected to 5V
Power supply；13rd capacitance one end is connected with twelfth resistor one end, and tie point is connected to eleventh resistor and the tenth resistance
Tie point；The 13rd capacitance other end and twelfth resistor other end ground connection；
AGC calculating control circuits are used to control the work of adjustable damping circuit comprising the 16th resistance, the 17th resistance, the
18 resistance, the 20th resistance, the 21st resistance, the 22nd resistance, the 23rd resistance, the 22nd capacitance, second
13 capacitances, the 24th capacitance, amplifier integrated package, MCU chip, their connection relation are：16th resistance one end is grounded,
The other end is sequentially connected with the 17th resistance, the 18th resistance, and the tie point of the 16th resistance and the 17th resistance is connected to fortune
Put an input terminal of integrated package No.1 operational amplifier, the tie point of the 17th resistance and the 18th resistance is connected to amplifier collection
Another input terminal of the output end of blocking No.1 operational amplifier, No.1 operational amplifier is connected to the another of the 15th resistance
The tie point of one end and the 19th capacitance;Other two pin of No.1 operational amplifier is grounded, connects 5V power supplys respectively;Tenth
The other end of eight resistance is connected to the 20th pin of MCU chip；14th pin of MCU chip connects 5V power supplys and the 26th capacitance
One end, the 26th capacitance the other end ground connection；5th pin of MCU chip is grounded；One termination MCU core of the 19th resistance
4th pin of piece, the other end connect the 20th resistance one end and the 21st capacitance one end, the 20th resistance it is another
The other end of end and the 21st capacitance is grounded;First pin of MCU chip connects an end feet of the 21st resistance, and the 21st
One end of one end and the 22nd capacitance of the 22nd resistance of another termination of resistance, another termination of the 22nd resistance
One end of one end of 23 resistance and the 23rd capacitance, the other end of the 22nd capacitance and the 23rd capacitance it is another
End ground connection；24th capacitance one end is grounded, and the other end is connected to an input of No. two operational amplifiers of amplifier integrated package
End, the output end of No. two operational amplifiers is connected to the other end of the 5th inductance, and is connect with another input terminal；
Second level amplifying circuit is for the output signal of adjustable damping circuit to be amplified, and output end is as entire circuit
Output end；It includes third low noise radio frequency amplifier tube, the 6th inductance, the 7th inductance, the 15th capacitance, the 16th capacitance,
17 capacitances;Their connection relation is：What the other end of the 9th capacitance was connected to third low noise radio frequency amplifier tube first draws
Foot（Input terminal）, one end of second pin (output end) the 6th inductance of connection, third pin ground connection；The other end of 6th inductance connects
Connect one end of the 7th inductance and one end of the 15th capacitance；One end of 16th capacitance is connected to the other end of the 7th inductance, and
It is connected to 5V power supplys, other end ground connection；The other end of 15th capacitance is connected to one end of the 17th capacitance, the 17th capacitance
The other end is radio frequency delivery outlet.
2. small-sized FTTH photoreceivers hardware circuit as described in claim 1, it is characterised in that the control of AGC calculating control circuits
It makes ranging from -5dBm and arrives -15dBm.
3. small-sized FTTH photoreceivers hardware circuit as described in claim 1, which is characterized in that it is characterized in that, the second level
Amplifying circuit further includes the first radio frequency protection pipe, the second radio frequency protection pipe；The other end of 15th capacitance connects the first radio frequency and protects
The third pin of pillar, the second pin of the first radio frequency protection pipe connect the first pin of the second radio frequency protection pipe, and the first pin connects
The second pin of second radio frequency protection pipe, the third pin ground connection of the second radio frequency protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810025161.4A CN108282231A (en) | 2018-01-11 | 2018-01-11 | A kind of small-sized FTTH photoreceivers hardware circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810025161.4A CN108282231A (en) | 2018-01-11 | 2018-01-11 | A kind of small-sized FTTH photoreceivers hardware circuit |
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| Publication Number | Publication Date |
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| CN108282231A true CN108282231A (en) | 2018-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810025161.4A Pending CN108282231A (en) | 2018-01-11 | 2018-01-11 | A kind of small-sized FTTH photoreceivers hardware circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380790A (en) * | 2019-08-16 | 2019-10-25 | 平湖新纳通信技术有限公司 | The reception device and its method of reseptance of extra low optical power receiver |
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| CN104506242A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control method for management type household optical receiving machine |
| CN204349993U (en) * | 2014-12-05 | 2015-05-20 | 上海凌云天博光电科技有限公司 | A kind of light-operated gain control circuit and optical receiver |
| CN207819927U (en) * | 2018-01-11 | 2018-09-04 | 向祖璧 | A kind of small-sized FTTH photoreceivers hardware circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050281564A1 (en) * | 2002-07-11 | 2005-12-22 | Koninklijke Philips Electronics N.V. | Optical receiver circuit |
| CN201947276U (en) * | 2010-12-30 | 2011-08-24 | 常熟市高事达光电科技有限公司 | Automatic optical gain control circuit for cable television network optical receiver |
| CN204349993U (en) * | 2014-12-05 | 2015-05-20 | 上海凌云天博光电科技有限公司 | A kind of light-operated gain control circuit and optical receiver |
| CN104506242A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control method for management type household optical receiving machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110380790A (en) * | 2019-08-16 | 2019-10-25 | 平湖新纳通信技术有限公司 | The reception device and its method of reseptance of extra low optical power receiver |
| CN110380790B (en) * | 2019-08-16 | 2024-03-26 | 平湖新纳通信技术有限公司 | Receiving device and receiving method of ultra-low optical power receiver |
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