CN108521305A - Fiber-optic signal receiving circuit - Google Patents
Fiber-optic signal receiving circuit Download PDFInfo
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- CN108521305A CN108521305A CN201810595289.4A CN201810595289A CN108521305A CN 108521305 A CN108521305 A CN 108521305A CN 201810595289 A CN201810595289 A CN 201810595289A CN 108521305 A CN108521305 A CN 108521305A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
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Abstract
The embodiment of the invention discloses a kind of fiber-optic signal receiving circuits, including：At least two-way fiber-optic signal receiving unit, first resistor and power supply, fiber-optic signal receiving unit receives optical signal, and the optical signal received is converted to pulse electrical signal and is exported from output end；Analog switch includes at least two input terminals, at least two control terminals and an output end, the output end of each fiber-optic signal receiving unit is electrically connected with one input terminal of analog switch, the control terminal of analog switch is corresponded with its input terminal, and analog switch is used to be connected or turn off between the input terminal and its output end corresponding to the control terminal according to the signal of its control terminal；The input terminal of signal amplification circuit is electrically connected with the output end of analog switch.The technical solution of the embodiment of the present invention, the optical signal sent by each fiber-optic signal receiving unit one fiber-optic signal transmission circuit of reception is converted into corresponding electric signal and has reached reduction power consumption, and reduces the technique effect of cost of manufacture.
Description
Technical field
The present embodiments relate to electronic circuit technology field more particularly to a kind of fiber-optic signal receiving circuits.
Background technology
Since optical fiber transmission has many advantages, such as that high reliability, transmission speed are fast, wiring is convenient, at low cost, in intelligent electric
In standing, the data exchange increasingly come uses Fibre Optical Communication Technology.
Wherein, in power distribution network in cable fault indicator application, a cable fault indicator terminal can access 4 to 8 sets
Cable fault indicator includes 3 display device for short circuit and an earth-fault indicator in a set of cable fault indicator.
16 to 32 fiber-optic signal transmission circuits, each fiber-optic signal hair can be corresponded to by calculating a cable fault indicator terminal in this way
Power transmission road includes a photodiode, for the pulse electrical signal received to be converted to optical signal.
Traditional fiber-optic signal transmission circuit is arranged in a one-to-one correspondence with fiber-optic signal receiving circuit, and an optical fiber letter
Number receiving circuit is only capable of receiving an optical signal, is converted to corresponding pulse electrical signal, is sent to the serial letter of microcontroller
Number port, it is of high cost there are fiber-optic signal receiving circuit equipment power dissipation is big, do not meet low-power consumption, low cost mentality of designing.
Invention content
In view of this, an embodiment of the present invention provides a kind of fiber-optic signal receiving circuit, electricity is received to solve fiber-optic signal
The problem that road power consumption is too high and cost of manufacture is too high.
An embodiment of the present invention provides a kind of fiber-optic signal receiving circuits, including：
At least two-way fiber-optic signal receiving unit, first resistor and power supply, the fiber-optic signal receiving unit include input
End and output end, the input terminal of the fiber-optic signal receiving unit are electrically connected by the first resistor and the output end of the power supply
It connects, the fiber-optic signal receiving unit receives optical signal, and the optical signal received is converted to pulse electrical signal from output end
Output；
Analog switch, the analog switch include at least two input terminals, at least two control terminals and an output end, often
The output end of a fiber-optic signal receiving unit is electrically connected with one input terminal of the analog switch, the control of the analog switch
End is corresponded with its input terminal, and the analog switch is used for the input corresponding to the control terminal according to the signal of its control terminal
It is connected or turns off between end and its output end；
Signal amplification circuit, the signal amplification circuit include input terminal and output end, the signal amplification circuit it is defeated
Enter end to be electrically connected with the output end of the analog switch.
Optionally, the fiber-optic signal receiving unit further includes photodiode and second resistance；
The anode of the photodiode is electrically connected with the first end of the second resistance, the second end of the second resistance
Ground connection；
The cathode of the photodiode is electrically connected with the first end of the first resistor, the second end of the first resistor
It is electrically connected with the output end of the power supply；
Output end of the anode of the photodiode as the fiber-optic signal receiving unit.
Optionally, further include triode, the first pole of the triode is electrically connected with the output end of the power supply, and described three
Second pole of pole pipe is electrically connected with the power input of the amplifying circuit, the base stage of the triode and each fiber-optic signal
The input terminal of receiving unit is electrically connected.
Optionally, the signal amplification circuit includes operational amplifier, 3rd resistor, the 4th resistance and the 5th resistance；
First power supply signal input of the operational amplifier is electrically connected with the second pole of the triode, the operation
The second source input end grounding of amplifier；
The first end of the 3rd resistor is electrically connected with the second pole of the triode, the second end of the 3rd resistor with
The first end of 4th resistance is electrically connected, and the negative input of the second end of the 3rd resistor and the operational amplifier
Electrical connection, the second end ground connection of the 4th resistance；
The first end of 5th resistance is electrically connected with the negative input of the operational amplifier, the 5th resistance
Second end is electrically connected with the electrode input end of the operational amplifier, and the second end of the 5th resistance and the analog switch
Output end electrical connection；
Output end of the output end of the operational amplifier as the signal amplification circuit.
Optionally, the operational amplification circuit further includes the 6th resistance, first end and the simulation of the 6th resistance
The output end of switch is electrically connected, the second end ground connection of the 6th resistance.
Optionally, the operational amplification circuit further includes the first capacitance, first electrode and the fortune of first capacitance
The electrode input end electrical connection of amplifier is calculated, the second electrode and the output end of the operational amplifier of first capacitance are electrically connected
It connects.
Optionally, the operational amplification circuit further includes the second capacitance, first electrode and the fortune of second capacitance
Calculate the first power supply signal input electrical connection of amplifier, the second electrode ground connection of second capacitance.
Optionally, the operational amplification circuit further includes third capacitance, the first electrode of the third capacitance and described the
The first end of four resistance is electrically connected, and the second electrode of the third capacitance is electrically connected with the second end of the 4th resistance.
Optionally, further include control unit, the output end of each fiber-optic signal receiving unit is electrically connected the control
One level signal input terminal of unit；
One level signal output end of the control terminal electrical connection described control unit of the analog switch, described control unit
Level signal output end and described control unit level signal input terminal correspond；
The output end of the signal amplification circuit is electrically connected with the serial signal port of described control unit.
Optionally, further include NOT gate；
The output end of the signal amplification circuit is electrically connected by the serial signal port of the NOT gate and described control unit
It connects；
The signal input part of the NOT gate is electrically connected with the output end of the signal amplification circuit, and the signal of the NOT gate is defeated
Outlet is electrically connected with the serial signal port of described control unit；
First power supply signal input of the NOT gate is electrically connected with the output end of the power supply；
The second source signal input part of the NOT gate is grounded.
An embodiment of the present invention provides a kind of fiber-optic signal receiving circuit, including at least one fiber-optic signal receiving unit,
It realizes a fiber-optic signal receiving circuit and corresponds to the optical signal for receiving at least one fiber-optic signal transmission circuit transmission, by every
One fiber-optic signal receiving unit receives the optical signal that a fiber-optic signal transmission circuit is sent and is converted into corresponding telecommunications
Number, and it is amplified, reach reduction power consumption, and reduce the technique effect of cost of manufacture.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram for fiber-optic signal receiving circuit that the embodiment of the present invention one provides；
Fig. 2 is a kind of structural schematic diagram of fiber-optic signal receiving circuit provided by Embodiment 2 of the present invention；
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
An embodiment of the present invention provides a kind of fiber-optic signal receiving circuits, referring to Fig. 1, the fiber-optic signal receiving circuit packet
It includes：At least two-way fiber-optic signal receiving unit 10, first resistor R1 and power supply VCC, fiber-optic signal receiving unit 10 include input
A1 and output end a2, the input terminal a1 of fiber-optic signal receiving unit 10 is held to pass through the output end electricity of first resistor R1 and power supply VCC
Connection, fiber-optic signal receiving unit 10 receives optical signal, and the optical signal received is converted to pulse electrical signal from output end
Output；Analog switch 20, analog switch 20 include at least two input terminal b1, at least two control terminal b2 and an output end b3
The output end a2 of (not shown), each fiber-optic signal receiving unit 10 is electrically connected with 20 1 input terminal b1 of analog switch, mould
The control terminal b2 and its input terminal b1 of quasi- switch 20 are corresponded, and analog switch 20 is used for should according to the signal of its control terminal b2
It is connected or turns off between input terminal b1 corresponding to control terminal b2 and its output end b3；Signal amplification circuit 30, signal amplification
Circuit 30 includes input terminal c1 and output end c2, the input terminal c1 of signal amplification circuit 30 and the output end b3 electricity of analog switch 20
Connection.
In the present embodiment, pulse signal is a kind of discrete signal, and shape is varied, with general analogue signal (as just
String wave) it compares, it is discontinuous (having apparent interval between waveform and waveform) in time shaft between waveform, but there is certain period
Property is its feature.Most common impulse wave is rectangular wave (namely square wave).Pulse signal can be used for indicating information, also may be used
To be used as the pulse code modulation in carrier wave, such as impulse modulation, pulse width modulation etc., it is also used as various numbers
The clock signal of word circuit, high performance chips.
It should be noted that in practical applications, fiber-optic signal transmission circuit big city is correspondingly arranged fiber-optic signal transmission
Circuit, and a fiber-optic signal transmission circuit includes a photodiode, it is corresponding to receive a pulse electrical signal, then by its turn
It is changed to corresponding optical signal, is transmitted to fiber-optic signal receiving circuit.Specifically, the pulse electrical signal of fiber-optic signal transmission circuit connects
Receiving end receives pulse electrical signal, when pulse electrical signal is low level, the photodiode conducting in fiber-optic signal transmission circuit,
And shine, when pulse electrical signal is high level, the photodiode in fiber-optic signal transmission circuit is not turned on, and is not shone,
It can be completed and the corresponding optical signal launch of pulse electrical signal is gone out.
Specifically, when pulse electrical signal is high level, the photodiode conducting in fiber-optic signal transmission circuit, concurrently
Light at this point, the fiber-optic signal receiving unit 10 of fiber-optic signal receiving circuit receives optical signal, and the optical signal received is converted
It is exported from output end for pulse electrical signal.It should be noted that the pulse telecommunications that fiber-optic signal receiving circuit is exported from output end
It is number corresponding with the pulse electrical signal that the pulse electrical signal receiving terminal of fiber-optic signal transmission circuit receives, but may be due to from telecommunications
Number-transmission of optical signal-electric signal, centre might have the loss of energy, cause fiber-optic signal receiving circuit defeated from output end
The pulse electrical signal gone out is corresponding with the pulse electrical signal that the pulse electrical signal receiving terminal of fiber-optic signal transmission circuit receives, but not
The identical situation of energy.Therefore the pulse electrical signal that signal amplification circuit 30 is used to convert the fiber-optic signal receiving unit 10
It is amplified, the pulse electrical signal for making it be received closer to the pulse electrical signal receiving terminal of fiber-optic signal transmission circuit.
In the prior art, traditional fiber-optic signal transmission circuit is arranged in a one-to-one correspondence with fiber-optic signal receiving circuit,
One fiber-optic signal receiving circuit includes only a fiber-optic signal receiving unit, therefore when the transmission of fiber-optic signal transmission circuit is more
When a optical signal, multiple fiber-optic signal receiving circuits are needed, cause equipment power dissipation big, problem of high cost.
It should be noted that it is real to need a control unit between fiber-optic signal receiving unit 10 and analog switch 20
Conducting or shutdown between the input terminal and corresponding output end of existing analog switch 20.Specifically, the quantity of analog switch can
With equal with the quantity of fiber-optic signal receiving unit, at this point, illustratively, analog switch may include single transistor.One
The output end a2 of fiber-optic signal receiving unit 10 is electrically connected with the first pole of a transistor, while the fiber-optic signal receiving unit 10
Output end a2 be electrically connected with a level signal input terminal of control unit, the level of the base stage of the transistor and control unit is believed
The electrical connection of number output end, control unit output control signals to the crystalline substance of the output end a2 electrical connections of the fiber-optic signal receiving unit 10
The base stage of body pipe, the control signal that transistor is received according to base stage is come the conducting or shutdown of controlling transistor.The transistor
The second pole be electrically connected with the input terminal c1 of signal amplification circuit 30, when transistor turns, fiber-optic signal receiving unit 10 it is defeated
The level signal of outlet a2 can be sent to the input terminal c1 of signal amplification circuit 30, be denoted as high level signal, signal amplification electricity
Road 30 exports after amplifying the high level signal, when transistor turns off, the voltage signal of the input terminal c1 of signal amplification circuit 30
It is denoted as low level signal.
The quantity of analog switch might be less that the quantity of fiber-optic signal receiving unit, and illustratively, analog switch can wrap
Include bilateral analog switch.The inside of each bilateral analog switch includes four sub switchs, each sub switch includes one defeated
Enter end, an output end and a control terminal.The input of the output end a2 and a sub switch of one fiber-optic signal receiving unit 10
End electrical connection, while the output end a2 of the fiber-optic signal receiving unit 10 and a level signal input terminal of control unit are electrically connected
It connects, the control terminal of the sub switch is electrically connected with the level signal output end of control unit, and sub switch is received according to control terminal
Level signal controls the conducting or shutdown of sub switch.The output end of the sub switch and the input terminal c1 of signal amplification circuit 30
Electrical connection, when which is connected, the level signal of the output end a2 of fiber-optic signal receiving unit 10 can be sent to signal and put
The input terminal c1 of big circuit 30 is denoted as high level signal, when output end turns off, the voltage of the input terminal c1 of signal amplification circuit 30
Signal is denoted as low level signal.
In the present embodiment, the pulse electrical signal that signal amplification circuit can receive the input terminal of signal amplification circuit
It is amplified.
Since fiber-optic signal transmission circuit big city is correspondingly arranged fiber-optic signal transmission circuit, and a fiber-optic signal sends electricity
Road includes a photodiode, corresponding to receive a pulse electrical signal, is then converted into corresponding optical signal, the present invention
Embodiment provides a kind of fiber-optic signal receiving circuit, including at least one fiber-optic signal receiving unit, realizes an optical fiber
Signal receiving circuit, which corresponds to, receives the optical signal that at least one fiber-optic signal transmission circuit is sent, and is connect by each fiber-optic signal
It receives the optical signal that unit one fiber-optic signal transmission circuit of reception is sent and is converted into corresponding electric signal, and it is amplified,
Reach reduction power consumption, and reduces the technique effect of cost of manufacture.
Embodiment two
On the basis of the above embodiments, an embodiment of the present invention provides a kind of fiber-optic signal receiving circuits, specifically,
In the present embodiment, further refinement is carried out to fiber-optic signal receiving unit, Fig. 2 is one kind provided by Embodiment 2 of the present invention
The structural schematic diagram of fiber-optic signal receiving circuit, it is illustrative in Fig. 2,4 fiber-optic signal receiving units 10 are shown, referring to Fig. 2,
The fiber-optic signal receiving unit 10 of the fiber-optic signal receiving circuit further includes photodiode D1 and second resistance R2.Photosensitive two pole
The anode of pipe D1 is electrically connected with the first end of second resistance R2, the second end ground connection of second resistance R2；The moon of photodiode D1
Pole is electrically connected as the input terminal a1 of fiber-optic signal receiving unit 10 with the first end of first resistor R1, and the second of first resistor R1
End is electrically connected with the output end of power supply VCC；Output end a2 of the anode of photodiode D1 as fiber-optic signal receiving unit 10.
The resistance value of first resistor R1 is 10 times of second resistance R2 or so, and illustratively, the resistance value of first resistor R1 can be the Europe 100K
The resistance value of nurse, second resistance R2 can be 10K ohm.Optionally, which further includes filter capacitor C0, filter
The first electrode of wave capacitance C0 is electrically connected with the output end of power supply VCC, the second electrode ground connection of filter capacitor C0.
Illustratively, analog switch 20 shown in Figure 2 is bilateral analog switch, the inside of each bilateral analog switch
Including four sub switchs, each sub switch includes an input terminal b1, output end b2 and control terminal b3.
Optionally, based on the above technical solution, further include triode 40, the first pole of triode 40 and power supply
The output end of VCC is electrically connected, and the second pole of triode 40 is electrically connected with the power input c3 of signal amplification circuit 30, triode
40 base stage is electrically connected with the input terminal a1 of each fiber-optic signal receiving unit 10.Illustratively, triode 40 shown in figure
Emitter is electrically connected with the output end of power supply VCC, the collector of triode 40 and the power input c3 of signal amplification circuit 40
Electrical connection.The effect of triode 40 is to provide power supply signal for signal amplification circuit 30.Specifically, when photodiode D1 hairs
The level signal of light time, photodiode D1 cathodes are low level, and triode 40 is connected, and power supply VCC is signal amplification circuit 30
Power supply signal is provided.When photodiode D1 does not shine, the level signal of photodiode D1 cathodes is high level, triode 40
It is not turned on, power supply VCC stops being that signal amplification circuit 30 provides power supply signal.Light letter is received in fiber-optic signal receiving unit 10
Number when, power supply VCC be signal amplification circuit 30 power supply signal is provided, achieved the effect that save power consumption.
Optionally, based on the above technical solution, signal amplification circuit 30 includes operational amplifier 301, third electricity
Hinder R3, the 4th resistance R4 and the 5th resistance R5；First power supply signal input d1 of operational amplifier 301 and triode 40
Second pole (collector) is electrically connected, the second source input terminal d2 ground connection of operational amplifier 301；The first end of 3rd resistor R3 with
The second pole (collector) of triode 40 is electrically connected, and the second end of 3rd resistor R3 is electrically connected with the first end of the 4th resistance R4,
And the second end of 3rd resistor R3 is electrically connected with the negative input d3 of operational amplifier 301, the second termination of the 4th resistance R4
Ground；The first end of 5th resistance R5 is electrically connected with the negative input d3 of operational amplifier 301, the second end of the 5th resistance R5 with
The electrode input end d4 electrical connections of operational amplifier 301, and the output end b2 of the second end of the 5th resistance R5 and analog switch 20
Electrical connection；Output end c2s of the output end d5 of operational amplifier 301 as signal amplification circuit 30.
Optionally, the resistance value of the 4th resistance R4 is far longer than the resistance value of 3rd resistor R3 so that operational amplifier 301 is born
The voltage very little of pole input terminal d3, illustratively, the resistance value of 3rd resistor R3 are 1/10th of the 4th resistance R4 resistance values.Work as light
When quick diode D1 does not shine, the level signal of photodiode D1 anodes is low level, and the effect of the 5th resistance R5 is to make
Operational amplifier 301 negative input d3 voltage be equal to operational amplifier 301 electrode input end d4 voltage because
When photodiode D1 does not shine, signal amplification circuit 30 is not necessarily to work, ensures the negative input d3's of operational amplifier 301
The voltage that voltage is equal to the electrode input end d4 of operational amplifier 301 can carry out to avoid the output end d5 of operational amplifier 301
The output of error signal.
Optionally, based on the above technical solution, signal amplification circuit 30 further includes the 6th resistance R6, the 6th resistance
The first end of R6 is electrically connected with the output end b2 of analog switch 20, the second end ground connection of the 6th resistance R6.As photodiode D1
From variations in light to when not shining, the level signals of photodiode D1 anodes becomes level signal from high level signal, and the 6th
Resistance R6 is used as discharge resistance so that the voltage signal of the electrode input end d4 of operational amplifier 301 is quick by high level signal
Become low level signal.
Optionally, based on the above technical solution, signal amplification circuit 30 further includes the first capacitance C1, the first capacitance
The first electrode of C1 is electrically connected with the electrode input end d4 of operational amplifier 301, and the second electrode of the first capacitance C1 is put with operation
The output end d5 electrical connections of big device 301.When photodiode D1 never variations in light to it is luminous when, photodiode D1 anodes
Level signal becomes high level signal from low level signal, and the first capacitance C1 is used as positive feedback capacitor so that operational amplifier 301
The voltage signal of output end d5 high level signal is quickly become from low level signal.
Meanwhile operational amplifier also has the effect for amplifying electric signal, operational amplifier 301 is due to by power supply VCC telecommunications
Number restriction effect, high level signal can be at most amplified to the number equal with the exportable voltage of the output end of power supply VCC
Value.
Optionally, based on the above technical solution, operational amplifier 301 further includes the second capacitance C2, the second capacitance
The first electrode of C2 is electrically connected with the first power supply signal input d1 of operational amplifier 301, the second electrode of the second capacitance C2
Ground connection.Second capacitance C2 is used as filter capacitor.
Optionally, based on the above technical solution, operational amplification circuit 30 further includes third capacitance C3, third capacitance
The first electrode of C3 is electrically connected with the first end of the 4th resistance 5R4, and the of the second electrode of third capacitance C3 and the 4th resistance R4
Two ends are electrically connected.Third capacitance C3 is used as filter capacitor.
Optionally, based on the above technical solution, further include control unit, each fiber-optic signal receiving unit 10
One level signal input terminal of output end a2 electrical connection control units；The control terminal b3 electrical connection control units of analog switch 20
One level signal output end, the level signal output end of control unit and the level signal input terminal of control unit correspond；
The output end of signal amplification circuit is electrically connected with the serial signal port of control unit.
Optionally, based on the above technical solution, further include NOT gate 50；The output end c2 of signal amplification circuit 30 is logical
NOT gate 50 is crossed to be electrically connected with the serial signal port of control unit；The signal input part e1 of NOT gate 50 and signal amplification circuit 30
Output end c2 electrical connections, the signal output end e2 of NOT gate 50 are electrically connected with the serial signal port of control unit；The of NOT gate 50
One power supply signal input e3 is electrically connected with the output end of power supply VCC；The second source signal input part e4 ground connection of NOT gate 50.
Control unit can be illustratively microcontroller.Referring to Fig. 2, fiber-optic signal receiving unit 10 receives optical signal, and
The optical signal received is converted into pulse electrical signal, photodiode D1 shines at this time, and the anode of photodiode D1 is height
Level, the electrode input end d4 and output end d5 of operational amplifier 301 are high level, the pulse with fiber-optic signal transmission circuit
The current potential for the pulse electrical signal that electric signal receiving terminal receives is on the contrary, therefore NOT gate 50 is defeated by the output end d5 of operational amplifier 301
The high level of the pulse electrical signal gone out is converted to low level, and low transition is high level, simultaneously because, NOT gate is active device
Part can improve the load capacity of fiber-optic signal receiving circuit.
Illustratively, bilateral analog switch is 4000 series CMOS integrated circuit CD4066, including 4 bidirectional analogs are opened
It closes.Operational amplifier 301 is the LMV321 of Texas Instrument, single channel low-voltage rail-to-rail input/output operational amplifier.NOT gate 50
For the SN74AHC1G14 of Texas Instrument, single channel schmidt trigger reverser.
Fiber-optic signal receiving circuit operation principle provided in an embodiment of the present invention is as follows：
Optical signal is received by 4 photodiode D1 that fiber-optic signal receiving unit 10 includes, 4 can be received simultaneously
Optical signal, has reached reduction fiber-optic signal receiving circuit power consumption, and reduces the technique effect of cost of manufacture, and by optical signal
It is converted to pulse electrical signal to export from the anode of photodiode, the input of the anode and a sub switch of a photodiode D1
B1 electrical connections are held, while the anode of photodiode D1 is electrically connected with a level signal input terminal of control unit, a son is opened
The control terminal b3 of pass is electrically connected with the level signal output end of the control unit, the level that sub switch is received according to control terminal b3
Signal controls the conducting or shutdown of sub switch.The input terminal c1 electricity of the output end b2 of the sub switch and signal amplification circuit 30
Connection, photodiode D1 receive optical signal, shine and are connected, the level signal input terminal of control unit receives photosensitive two
The level signal of the anode of pole pipe D1 is at this time high level signal, and control unit outputs control signals to photodiode D1
Anode electrical connection sub switch control terminal b3, sub switch conducting, the level signal of the anode of photodiode D1 can be with
It is transferred to the input terminal c1 of signal amplification circuit 30 by the sub switch of conducting, is denoted as high level signal, signal amplification circuit 30
It is exported after the high level signal is amplified；Photodiode D1 does not receive optical signal, does not shine and is not turned on, control unit
Level signal input terminal receives the level signal of the anode of photodiode D1, is at this time low level signal, which closes
Disconnected, the voltage signal of the input terminal c1 of signal amplification circuit 30 is denoted as low level signal.
The photodiode D1 for including by fiber-optic signal receiving unit 10 does not receive optical signal, the level letter of control unit
Number input terminal receives the low level in pulse electrical signal, disconnects bilateral analog switch 20, is transmitted to the anode of operational amplifier 301
The corresponding low level signals of input terminal d4；
The resistance value of 4th resistance R4 is far longer than the resistance value of 3rd resistor R3 so that the cathode of operational amplifier 301 inputs
The voltage very little of d3 is held, because when photodiode D1 does not shine, signal amplification circuit 30 is not necessarily to work, ensures operational amplifier
The voltage that the voltage of 301 negative input d3 is equal to the electrode input end d4 of operational amplifier 301 can be to avoid operation amplifier
The output end d5 of device 301 carries out the output of error signal.
For operational amplifier 301, when the level signal of electrode input end d4 becomes low level signal from high level signal,
6th resistance R6 promotes the level signal of electrode input end d4 quickly to become low level letter from high level signal as discharge resistance
Number；When the level signal of electrode input end d4 becomes high level signal from low level signal, the first capacitance C1 is as positive and negative feed
Hold so that the voltage signal of the output end d5 of operational amplifier 301 quickly becomes high level signal from low level signal.For fortune
Amplifier 301 is calculated to be amplified it so that output end d5's when the level signal of electrode input end d4 is high level signal
The value of high level signal is up to the voltage signal that power supply VCC is capable of providing；
For operational amplifier 301, when the level signal of electrode input end d4 is low level signal, the 5th resistance R5 is protected
The voltage for the electrode input end d4 that the voltage for demonstrate,proving the negative input d3 of operational amplifier 301 is equal to operational amplifier 301 can be with
The output end d5 of operational amplifier 301 is avoided to carry out the output of error signal.
The high level of the pulse electrical signal of the output end d5 outputs of operational amplifier 301 is converted to low level by NOT gate 50,
Low transition is high level, simultaneously because, NOT gate is active device, and the band that can improve fiber-optic signal receiving circuit carries energy
Power.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts, be combined with each other and substitutes without departing from protection scope of the present invention.Therefore, although by above example to this
Invention is described in further detail, but the present invention is not limited only to above example, is not departing from present inventive concept
In the case of, can also include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of fiber-optic signal receiving circuit, which is characterized in that including：
At least two-way fiber-optic signal receiving unit, first resistor and power supply, the fiber-optic signal receiving unit include input terminal and
The input terminal of output end, the fiber-optic signal receiving unit is electrically connected by the first resistor with the output end of the power supply,
The fiber-optic signal receiving unit receives optical signal, and it is defeated from output end that the optical signal received is converted to pulse electrical signal
Go out；
Analog switch, the analog switch include at least two input terminals, at least two control terminals and an output end, Mei Gesuo
The output end for stating fiber-optic signal receiving unit is electrically connected with one input terminal of the analog switch, the control terminal of the analog switch with
Its input terminal corresponds, the analog switch be used for according to the signal of its control terminal by corresponding to the control terminal input terminal with
It is connected or turns off between its output end；
Signal amplification circuit, the signal amplification circuit include input terminal and output end, the input terminal of the signal amplification circuit
It is electrically connected with the output end of the analog switch.
2. receiving circuit according to claim 1, which is characterized in that
The fiber-optic signal receiving unit further includes photodiode and second resistance；
The anode of the photodiode is electrically connected with the first end of the second resistance, the second termination of the second resistance
Ground；
The cathode of the photodiode is electrically connected with the first end of the first resistor, the second end of the first resistor and institute
State the output end electrical connection of power supply；
Output end of the anode of the photodiode as the fiber-optic signal receiving unit.
3. receiving circuit according to claim 1, which is characterized in that further include triode, the first pole of the triode
It being electrically connected with the output end of the power supply, the second pole of the triode is electrically connected with the power input of the amplifying circuit,
The base stage of the triode is electrically connected with the input terminal of each fiber-optic signal receiving unit.
4. receiving circuit according to claim 3, which is characterized in that
The signal amplification circuit includes operational amplifier, 3rd resistor, the 4th resistance and the 5th resistance；
First power supply signal input of the operational amplifier is electrically connected with the second pole of the triode, the operation amplifier
The second source input end grounding of device；
The first end of the 3rd resistor is electrically connected with the second pole of the triode, the second end of the 3rd resistor with it is described
The first end of 4th resistance is electrically connected, and the second end of the 3rd resistor and the negative input of the operational amplifier are electrically connected
It connects, the second end ground connection of the 4th resistance；
The first end of 5th resistance is electrically connected with the negative input of the operational amplifier, and the second of the 5th resistance
End is electrically connected with the electrode input end of the operational amplifier, and the second end of the 5th resistance and the analog switch is defeated
Outlet is electrically connected；
Output end of the output end of the operational amplifier as the signal amplification circuit.
5. receiving circuit according to claim 4, which is characterized in that the operational amplification circuit further includes the 6th resistance,
The first end of 6th resistance is electrically connected with the output end of the analog switch, the second end ground connection of the 6th resistance.
6. receiving circuit according to claim 4, which is characterized in that
The operational amplification circuit further includes the first capacitance, and the first electrode of first capacitance and the operational amplifier are just
Pole input terminal electrical connection, the second electrode of first capacitance are electrically connected with the output end of the operational amplifier.
7. receiving circuit according to claim 4, which is characterized in that
The operational amplification circuit further includes the second capacitance, and the of the first electrode of second capacitance and the operational amplifier
One power supply signal input is electrically connected, the second electrode ground connection of second capacitance.
8. receiving circuit according to claim 4, which is characterized in that
The operational amplification circuit further includes third capacitance, the first electrode of the third capacitance and the first of the 4th resistance
End electrical connection, the second electrode of the third capacitance are electrically connected with the second end of the 4th resistance.
9. receiving circuit according to claim 1, which is characterized in that further include control unit,
One level signal input terminal of the output end electrical connection described control unit of each fiber-optic signal receiving unit；
One level signal output end of the control terminal electrical connection described control unit of the analog switch, the electricity of described control unit
Flat signal output end and the level signal input terminal of described control unit correspond；
The output end of the signal amplification circuit is electrically connected with the serial signal port of described control unit.
10. receiving circuit according to claim 9, which is characterized in that further include NOT gate；
The output end of the signal amplification circuit is electrically connected by the NOT gate with the serial signal port of described control unit；
The signal input part of the NOT gate is electrically connected with the output end of the signal amplification circuit, the signal output end of the NOT gate
It is electrically connected with the serial signal port of described control unit；
First power supply signal input of the NOT gate is electrically connected with the output end of the power supply；
The second source signal input part of the NOT gate is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810595289.4A CN108521305A (en) | 2018-06-11 | 2018-06-11 | Fiber-optic signal receiving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810595289.4A CN108521305A (en) | 2018-06-11 | 2018-06-11 | Fiber-optic signal receiving circuit |
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| CN108521305A true CN108521305A (en) | 2018-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810595289.4A Pending CN108521305A (en) | 2018-06-11 | 2018-06-11 | Fiber-optic signal receiving circuit |
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