CN105978628A - Optical module - Google Patents
Optical module Download PDFInfo
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- CN105978628A CN105978628A CN201610412343.8A CN201610412343A CN105978628A CN 105978628 A CN105978628 A CN 105978628A CN 201610412343 A CN201610412343 A CN 201610412343A CN 105978628 A CN105978628 A CN 105978628A
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- input signal
- signal
- voltage
- circuit
- frequency range
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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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
- H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
Abstract
The invention discloses an optical module. The optical module comprises a first filtering circuit used for performing filtering processing for the set frequency band of a first path of input signals; a second filtering circuit used for performing filtering processing for the set frequency band of a second path of input signals; a voltage translation circuit connected with the first filtering circuit and used for translating the voltage of the first path of the input signals after being subjected to the filtering processing to enable the voltage difference between the first path of the input signals and the second path of the input signals after the translation to be smaller than the voltage difference between the first path of the input signals and the second path of the input signals before the translation; and a first differential circuit connected with the voltage translation circuit and the second filtering circuit and used for performing differential processing for the first path of the input signals after being subjected to the voltage translation and the second path of the input signals after being subjected to the filtering processing. According to the optical module, the voltage difference of the set frequency bands of the two paths of the input signals is attenuated efficiently.
Description
Technical field
The present embodiments relate to communication technical field, particularly relate to a kind of optical module.
Background technology
Along with the propelling of unification of three nets national strategy, increasingly it is subject to by the video signal transmission of optical transmission system
To paying attention to.But meanwhile, high performance video-signal filter and amplification demand become more and more tighter the most therewith
Compel.Particularly fractional transmission system requirements filters high-frequency signal, this just design to amplifier and wave filter carry
Go out higher requirement.
As it is shown in figure 1, in prior art, use amplifier and wave filter to realize video signal is amplified
And filtering, video signal transmits after optical module through optical transmission system, the APD (Avalanche of optical module
Photo-Diode, avalanche photodide) optical signal received is carried out opto-electronic conversion, after conversion
After video signal is amplified, in the way of Single-end output, exports wave filter be filtered, video signal bag
Include low, intermediate-freuqncy signal (referred to as working frequency range), also include some unwanted high-frequency signals, such as system noise
The interference signal of sound and power-supply fluctuation, the wave filter in Fig. 1 is mainly used to filter unwanted high-frequency signal.
But, the filter effect of existing wave filter is unsatisfactory.As in figure 2 it is shown, the filter effect of prior art is:
The amplitude of high-frequency signal has simply been decayed a part, and the decay of high-frequency signal is thorough, with working frequency range phase not
Ratio, still there is higher proportion in high-frequency signal, namely compared with the signal amplitude of working frequency range, high frequency is believed
The decay of number amplitude is inadequate, and not up to specific occasion filters the requirement of high-frequency signal completely.Therefore, existing filter
The frequency selective characteristic of ripple device cannot meet specific occasion application requirement.
To sum up, when using optical transmission system transmission video signal, the setting to signal of the existing filtering method is used
, such as high-frequency signal, when being filtered, there is the halfway problem of decay setting frequency range in frequency range.
Summary of the invention
The embodiment of the present invention provides a kind of optical module, in order to solve employing optical transmission system transmission in prior art
During video signal, when using existing filtering method that the setting frequency range of signal is filtered, there is setting frequency range
The halfway problem of decay.
In order to solve the problems referred to above, the embodiment of the present invention provides a kind of optical module, including:
First filter circuit, is filtered processing for first via input signal sets frequency range；
Second filter circuit, is filtered processing for the second tunnel input signal is set frequency range；Described first
The amplitude of road input signal and described second tunnel input signal is equal, and polarity of voltage is contrary；The described first via is defeated
Enter signal setting frequency range identical with described second tunnel input signal setting frequency range；
Voltage shifts circuit, is connected with described first filter circuit, for described the after filtered process
The voltage of one tunnel input signal translates so that described first via input signal and the second tunnel input after translation
The voltage difference of signal is less than the voltage of described first via input signal before translation with described second tunnel input signal
Difference；
First difference channel, is connected with described voltage shifts circuit, described second filter circuit, for warp
Described first via input signal after voltage shifts and the described second tunnel input signal after filtered process are entered
Row difference processing.
In above-mentioned optical module, in order to more thoroughly filter unwanted setting frequency range in transmission signal, by optical mode
The signal that block receives is input in two filter circuits in the way of Differential Input, in order to reduce Differential Input
Two-way input signal set frequency range voltage difference, make the first filter circuit to first via input signal set frequency
Section is filtered processing；Make the second filter circuit that the second tunnel input signal is set frequency range be filtered processing；
Set the voltage difference of frequency range in order to reduce two-way input signal further, make voltage shifts circuit, to filtered
The voltage of the first via input signal after process translates so that the first via input signal after translation and the
The voltage difference of two tunnel input signals is less than the voltage of first via input signal before translation with the second tunnel input signal
Difference；For the voltage difference making output signal be first via input signal and the second tunnel input signal, by first
Difference channel is to the second tunnel input letter after the first via input signal after voltage shifts and filtered process
Number carrying out difference processing, so, output signal sets the voltage of frequency range and is first via input signal and second
Road input signal is setting the voltage difference of frequency range, the difference processing of the first difference channel so that the first via inputs
Signal and the second tunnel input signal cancel each other at the voltage setting frequency range, therefore, filter by above-mentioned first
Circuit, the second filter circuit, voltage shifts circuit and the effect of the first difference channel so that in output signal
The voltage setting frequency range obtains decaying more thoroughly.
Accompanying drawing explanation
Accompanying drawing is for providing a further understanding of the present invention, and constitutes a part for description, with this
Bright embodiment is used for explaining the present invention together, is not intended that limitation of the present invention.In the accompanying drawings:
The signal filter circuit of a kind of optical module that Fig. 1 provides for prior art；
The filter effect schematic diagram of a kind of signal filter circuit that Fig. 2 provides for prior art；
The structural representation of a kind of optical module that Fig. 3 a to Fig. 3 b provides for the embodiment of the present invention；
The filter effect schematic diagram of a kind of optical module that Fig. 4 provides for the embodiment of the present invention；
The structural representation of a kind of optical module that Fig. 5 provides for the embodiment of the present invention；
The structural representation of a kind of optical module that Fig. 6 provides for the embodiment of the present invention；
The structural representation of a kind of optical module that Fig. 7 provides for the embodiment of the present invention.
Detailed description of the invention
When using existing filtering method that the setting frequency range of signal is filtered to solve, there is setting frequency
The halfway problem of decay of section, the embodiment of the present invention provides a kind of optical module, including the first filter circuit,
Second filter circuit, voltage shifts circuit and the first differential amplifier circuit, wherein, the first filter circuit and electricity
Pressing shift circuit connects, and voltage shifts circuit and the second filter circuit are all connected with the first differential amplifier circuit.
In order to more thoroughly filter unwanted setting frequency range in transmission signal, the signal received by optical module is with difference
The mode dividing input is input in two filter circuits, sets to reduce the two-way input signal of Differential Input
The voltage difference of frequency range, makes the first filter circuit that first via input signal sets frequency range and is filtered processing；Order
Second filter circuit sets frequency range to the second tunnel input signal and is filtered processing；In order to reduce two-way further
Input signal sets the voltage difference of frequency range, makes voltage shifts circuit, inputs the first via after filtered process
The voltage of signal translates so that the first via input signal after translation and the voltage of the second tunnel input signal
Difference is less than the voltage difference of first via input signal before translation with the second tunnel input signal；In order to make output signal be
First via input signal and the voltage difference of the second tunnel input signal, by the first difference channel to through voltage shifts
After first via input signal and the second tunnel input signal after filtered process carry out difference processing, so,
Output signal sets the voltage of frequency range and is first via input signal with the second tunnel input signal in setting frequency range
Voltage difference, the difference processing of the first difference channel so that first via input signal and the second tunnel input signal
Cancelling each other at the voltage setting frequency range, therefore, above-mentioned optical module is by the first filter circuit, the second filtering
Circuit, voltage shifts circuit and the effect of the first differential amplifier circuit so that set in a road signal of output
The voltage of frequency range obtains decaying more thoroughly.
In order to make technical problem solved by the invention, technical scheme and effective clearer, with
The preferred embodiments of the present invention are illustrated by lower combination Figure of description, it will be appreciated that described herein
Preferred embodiment is merely to illustrate and explains the present invention, is not intended to limit the present invention.And do not conflict
In the case of, the embodiment in the application and the feature in embodiment can be mutually combined.
A kind of optical module as shown in Figure 3 a, including: the first filter circuit, the second filter circuit, voltage
Translation circuit and the first differential amplifier circuit, such as the annexation in Fig. 3 a, first via input signal inputs
To the input of the first filter circuit, the outfan of the first filter circuit connects with the input of voltage shifts circuit
Connecing, the outfan of voltage shifts circuit and the input of the first difference channel connect, the second output signal input
Input to the second filter circuit；The outfan of the second filter circuit and the input of the first difference channel are even
Connecing, the outfan of the first difference channel exports a road output signal.
First filter circuit, is filtered processing for first via input signal sets frequency range, makes the first via
Input signal sets amplitude (peak value of the voltage) decay of frequency range.
Second filter circuit, is filtered processing for the second tunnel input signal is set frequency range, makes the second tunnel
Input signal sets the amplitude decay of frequency range.
Voltage shifts circuit, for the voltage of the first via input signal after filtered process is translated,
Make the voltage difference with the second tunnel input signal of the first via input signal after translation less than the first via before translation
Input signal and the voltage difference of the second tunnel input signal.
First difference channel, after the described first via input signal after voltage shifts and filtered process
Described second tunnel input signal carry out difference processing.
In above-mentioned optical module, in order to the voltage difference of first via input signal and the second tunnel input signal is put
Greatly, in a kind of preferred embodiment, the first difference channel is the first differential amplifier circuit, makes the first difference put
Big circuit is first to the described first via input signal after voltage shifts and described second after filtered process
Road input signal carries out difference processing, then to the first via input signal after difference processing and the second tunnel input
The voltage difference of signal is amplified processing, and exports amplified process Hou mono-tunnel output signal.Such as Fig. 3 b
Shown in.
In above-mentioned optical module, in order to the voltage difference of first via input signal and the second tunnel input signal is put
Greatly, it is possible to make the first difference channel connect an amplifying circuit, it is used for first via input signal and the second tunnel
The voltage difference of input signal is amplified processing, and exports amplified process Hou mono-tunnel output signal.
Defeated for above-mentioned first via input signal and the second tunnel input signal, first via input signal and the second road
Entering signal is a pair differential signal；Differential transfer is different from the way of a traditional piece ground wire of holding wire,
Differential transfer all transmits signal in this both threads, and the amplitude of the two signal is equal, opposite in phase.At this
In both threads, the signal of transmission is exactly differential signal.In the embodiment of the present invention, a pair differential signal of optical module
By first holding wire transmission first via input signal, transmit the second tunnel input letter by second holding wire
Number, first via input signal is equal with the amplitude of the second road differential signal, and polarity of voltage is contrary, and the first via is defeated
Enter signal and the second tunnel input signal can be analogue signal, it is also possible to be digital signal.Analogue signal refers to shake
The value of width is continuous print (amplitude can be represented by limitless number value), and analogue signal continuous in time is continuous
The image of change.On circuit boards, difference cabling must be isometric, wide, in close proximity to and same
The both threads of aspect.
Frequency range is set for above-mentioned first via input signal and the second tunnel input signal sets frequency range, can be high
Frequently signal, it is also possible to being other frequency ranges, it is not specifically limited by the present invention, but first via input signal sets
Determine frequency range identical with the second tunnel input signal setting frequency range.
Accommodation can be carried out according to setting frequency range for the first filter circuit and the second filter circuit, and
It is not limited to a kind of filter circuit of embodiment of the present invention example.Because the first filter circuit is for inputting the first via
The setting frequency range of signal is filtered, and the first filter circuit is for entering the setting frequency range of the second tunnel input signal
Row filtering, first via input signal is equal with the amplitude of the second road differential signal, and polarity of voltage is contrary, therefore,
First filter circuit and the second filter circuit are the most anti-phase RC filter circuit, and RC filter circuit includes
The adjustable resistor being connected in parallel and adjustable condenser, and ground capacitor.RC filter circuit is concrete such as
Shown in Fig. 7, including 3 groups of adjustable resistors being connected in parallel (3nH) and adjustable condenser (2pF), each
Adjustable resistor and adjustable condenser that group is connected in parallel all pass through ground capacitor (1pF) ground connection.
For voltage shifts circuit, including multiple adjustable resistances, by regulating the resistance of these multiple adjustable resistances
Dividing potential drop parameter adjusts the voltage shifts amount of first via input signal.
Such as, as it is shown in fig. 7, voltage shifts circuit include the first adjustable resistance being connected in series, second can
Adjust resistance and the 3rd adjustable resistance；Voltage shifts circuit is by regulating the first adjustable resistance, the second adjustable resistance
With the electric resistance partial pressure parameter of the 3rd adjustable resistance, adjust the voltage shifts amount of first via input signal.Wherein,
First end of the first adjustable resistance R3 and the first filter circuit connect, second end of the first adjustable resistance R3
It is connected with the first differential amplifier circuit；The first of second adjustable resistance R1 terminates into power supply signal, and second can
Second end of resistance R1 and second end of the first adjustable resistance R3 is adjusted to connect；The of 3rd adjustable resistance R2
One end ground connection, second end of the 3rd adjustable resistance R2 and first end of the first adjustable resistance R3 connect.
Utilize voltage shifts circuit that the first via input signal being filtered after processing is carried out voltage shifts
Purpose is, the voltage shifts that first via input signal sets frequency range sets frequency to close to the second tunnel input signal
The voltage of section so that first via input signal sets frequency range and the voltage difference of the second tunnel input signal setting frequency range
Close to 0.In the embodiment of the present invention, when first via input signal sets the voltage shifts amount of frequency range equal to first
(the 2 of the amplitude of first via input signal after the amplitude of road input signal and the amplitude of the second tunnel input signal
Times) time, after translation, first via input signal sets the voltage of frequency range equal to the second tunnel input signal setting frequency
The voltage of section, now first via input signal sets frequency range and the voltage difference of the second tunnel input signal setting frequency range
Equal to 0, then after the first difference channel carries out difference processing to first via input signal and the second tunnel input signal,
The voltage difference setting frequency range of first via input signal and the second tunnel input signal is as 0 so that after difference processing
A road output signal set frequency range voltage thoroughly decayed.
In above-mentioned optical module, in order to more thoroughly filter unwanted setting frequency range in transmission signal, by optical mode
The signal that block receives is input in two filter circuits in the way of Differential Input, in order to reduce Differential Input
Two-way input signal set frequency range voltage difference, make the first filter circuit to first via input signal set frequency
Section is filtered processing；Make the second filter circuit that the second tunnel input signal is set frequency range be filtered processing；
Set the voltage difference of frequency range in order to reduce two-way input signal further, make voltage shifts circuit, to filtered
The voltage of the first via input signal after process translates so that the first via input signal after translation and the
The voltage difference of two tunnel input signals is less than the voltage of first via input signal before translation with the second tunnel input signal
Difference；For the voltage difference making output signal be first via input signal and the second tunnel input signal, by first
Difference channel is to the second tunnel input letter after the first via input signal after voltage shifts and filtered process
Number carrying out difference processing, so, output signal sets the voltage of frequency range and is first via input signal and second
Road input signal is setting the voltage difference of frequency range, the difference processing of the first difference channel so that the first via inputs
Signal and the second tunnel input signal cancel each other at the voltage setting frequency range, therefore, filter by above-mentioned first
Circuit, the second filter circuit, voltage shifts circuit and the effect of the first difference channel so that in output signal
The voltage setting frequency range obtains decaying more thoroughly.
Below as a example by the optical module internal structure shown in Fig. 3 b, and combine accompanying drawing 4 and illustrate that the first via inputs
Signal, the attenuation process of voltage of the second tunnel input signal setpoint frequency.
(1) in Fig. 4 illustrates first via input signal and the second tunnel input signal and is being filtered place
The amplitude of the voltage before reason, because the amplitude of first via input signal and the second tunnel input signal is equal, therefore the
The voltage swing of one tunnel input signal and the second tunnel input signal is equal, opposite polarity, i.e. first via input letter
Number and the second tunnel input signal voltage be respectively-V0, V0.
(2) in Fig. 4 illustrate the first filter circuit first via input signal is filtered process after
The amplitude of voltage, and the second filter circuit is filtered the voltage after processing to the second tunnel input signal
Amplitude, because the first filter circuit only sets frequency range to first via input signal, (exemplify in Fig. 4 is high frequency
Frequency range) it is filtered processing, the second filter circuit only sets frequency range to the second tunnel input signal and is filtered place
Reason, therefore, after first via input signal is filtered processing by the first filter circuit, first via input signal
Set the voltage attenuation of frequency range as the first amplitude-V1；Second tunnel input signal is filtered by the second filter circuit
After ripple processes, the second tunnel input signal sets the voltage attenuation of frequency range as the second amplitude V1, wherein, first
Amplitude is equal in magnitude with the second amplitude, opposite polarity.
According to (2) in Fig. 4, after being filtered processing, first via input signal sets frequency range and the second tunnel
Input signal sets the voltage difference of frequency range (exemplify in Fig. 4 is high-frequency band) as the second amplitude and first
The difference of amplitude, i.e. V1-(-V1)=2V1.
(3) in Fig. 4 illustrate voltage shifts circuit to the first via input signal after filtered process
Carry out the amplitude of the voltage after voltage shifts, because the first via after filtered process is inputted by voltage shifts circuit
The voltage of signal has carried out integral translation, if voltage shifts amount is Δ V, first via input signal sets frequency
The voltage of section is the 3rd amplitude V2 (V2 by the first amplitude-V1 translation-=-V1+ Δ V)；
According to (3) in Fig. 4, after first via input signal carries out voltage shifts process, first via input letter
Number setting frequency range and the second tunnel input signal sets the voltage difference difference as the second amplitude Yu the 3rd amplitude of frequency range,
I.e. V1-V2=V1-(-V1+ Δ V)=2V1-Δ V.The size of voltage shifts amount Δ V is not done by the present invention
Concrete restriction, can be controlled by voltage shifts circuit.
Preferably, as shown in (4) in Fig. 4, when the size of voltage shifts amount Δ V is equal to 2V1, the
One tunnel input signal sets frequency range, and (exemplify in Fig. 4 is high again and again with the second tunnel input signal setting frequency range
Section) voltage difference be 0, V1-V2=2V1-Δ V=0, set can thoroughly being decayed of frequency range.Cause
This, if the size of voltage shifts amount Δ V is equal to 2V1, then voltage shifts circuit is to the after filtered process
After the voltage of one tunnel input signal translates, first via input signal sets the voltage of frequency range equal to the second tunnel
The voltage of the setting frequency range after input signal Filtering Processing, the i.e. second amplitude is equal to the 3rd amplitude.
As shown in (5) in Fig. 4, when the size of Δ V is equal to the 3rd width equal to 2V1, the i.e. second amplitude
During value, the voltage difference of first via input signal and the second tunnel input signal is put by the first differential amplifier circuit
After big (V0 ' be the voltage difference of low frequency frequency range amplified after voltage magnitude), because first via differential signal sets
Determine frequency range and the second road differential signal set the voltage difference of frequency range (exemplify in Fig. 4 is high-frequency band) as
0, output signal sets the amplitude of frequency range as 0, and i.e. after differential amplification, high-frequency band is thoroughly filtered.
It is the voltage between two-way input signal for the first differential amplifier circuit in the embodiment of the present invention
The circuit that difference is amplified with a fixed gain, and current potential over the ground common to two-way input signal does not acts as
With.First differential amplifier circuit, is used for (referring to first via input signal after filtering and voltage shifts
After first via input signal) with the second tunnel input signal (after filtering process after the second tunnel input signal)
Voltage difference be amplified process.First differential amplifier circuit includes two inputs and an outfan, warp
First via input signal after voltage shifts and the second tunnel input signal after filtered process are input to first
Two inputs of differential amplifier circuit, and it is coupled as a road output signal, the voltage of output signal is first
Road input signal and the voltage difference of the second tunnel input signal, put from the first difference after the voltage amplification of output signal
The outfan output of big circuit.
Such as, the first differential amplifier circuit as shown in Figure 7, including three poles of a starting voltage amplification
Pipe, the first electrode of audion and two inputs that the second electrode is the first differential amplifier circuit, audion
The outfan that the 3rd electrode is the first differential amplifier circuit.The first via after filtered process, voltage shifts
Input signal is input to the first electrode of audion, and the second tunnel input signal after filtered process is input to three
Second electrode of pole pipe；First via input signal and the second tunnel input signal differential coupling are a road output letter
Number, the voltage of output signal is first via input signal and the voltage difference of the second tunnel input signal, output signal
After Bei Fang great ing, from the 3rd electrode output of audion.
Based on the first filter circuit in above-mentioned optical module, the second filter circuit, voltage shifts circuit and first
Differential amplifier circuit sets frequency range and the voltage of the second tunnel input signal setting frequency range to first via input signal
Difference carries out the process decayed, and the optical module of the embodiment of the present invention is except including the first filtering in above-mentioned optical module
Outside circuit, the second filter circuit, voltage shifts circuit and the first differential amplifier circuit, also include: light connects
Receive device and the second differential amplifier circuit；The most as shown in Figure 5.
Optical receiver, is used for receiving optical signal, and the optical signal of reception is converted into the signal of telecommunication, and by telecommunications
Number it is input to the second differential amplifier circuit according to the mode of Differential Input；
Second differential amplifier circuit, for being amplified the first via signal of Differential Input, exports the first via
Input signal；Second road signal of Differential Input is amplified, exports the second tunnel input signal.
The first via input signal of the second differential amplifier circuit output, the input being the first filter circuit is defeated
The first via input signal entered；Second tunnel input signal of the second differential amplifier circuit output, is the second filter
Second tunnel input signal of the input input of wave circuit.
Wherein, first via signal and the second road signal are a pair differential signal, first via signal and the second road letter
Number amplitude equal, opposite in phase (opposite polarity).The polarity of voltage of first via signal is negative, the second tunnel
The polarity of voltage of signal is just.
Optionally, the polarity of voltage of first via signal is just, the polarity of voltage of the second road signal is negative, so,
The voltage of first via input signal is just, the voltage of the second tunnel input signal is negative, as shown in Figure 6.
For the second differential amplifier circuit in the embodiment of the present invention, in a kind of detailed description of the invention, second is poor
Dividing amplifying circuit is push-pull type differential amplifier circuit, including pushing-type amplifying circuit and pull amplifying circuit, pushing-type
Amplifying circuit, for being amplified processing to the first via signal of input, exports first via input signal；Draw
Formula amplifying circuit, for being amplified processing to the second road signal of input, exports the second tunnel input signal.
Pushing-type amplifying circuit and pull amplifying circuit alternation, i.e. pushing-type amplifying circuit turn on and to first inputted
When road signal is amplified processing, pull amplifying circuit is not turned on, when the conducting of pull amplifying circuit and to input
The second road signal be amplified process time, pushing-type amplifying circuit is not turned on.
Push-pull type differential amplifier circuit includes two audions playing amplification, push-pull type differential amplifier circuit
In, a triode operation is when conducting state, and another audion is in cut-off state, works as input signal
After changing to another half cycle, the audion entrance cut-off state of original conducting, and the audion originally ended
Entering conducting state, two audions are in constantly alternate conduction and cut-off change.
The entity circuit of a kind of optical module that Fig. 7 provides for the embodiment of the present invention, including the second differential amplification electricity
Road, the first filter circuit, the second filter circuit, voltage shifts circuit and the first differential amplifier circuit.
In above-described embodiment, use push-pull type differential amplifier circuit that the two paths of signals of a pair differential signal is carried out
After preliminary amplification, Differential Input to two filter circuit, the signal then one of them filter circuit exported
Carry out voltage shifts, carry out a road signal of voltage shifts Hou mono-road signal and the output of another filter circuit
Differential Input can regulate to the first differential amplifier circuit, the electric resistance partial pressure parameter of voltage shifts circuit together,
Can ensure that the voltage of this two paths of signals setting frequency range cancels each other, reach to effective filter out disabling signal in band
Effect, band in disabling signal be the unwanted high-frequency signal carried in working frequency range.It addition, with difference
The mode dividing input is filtered and amplifies, and inherently can suppress to carry outer disabling signal, carry outer disabling signal
Refer to be distributed in the irrelevant signal outside signal spectrum, as system noise and power-supply fluctuation are disturbed.Can be by outside band
Disabling signal decay more than 40dB.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know base
This creativeness concept, then can make other change and amendment to these embodiments.So, appended right is wanted
Ask and be intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. an optical module, it is characterised in that including:
First filter circuit, is filtered processing for first via input signal sets frequency range；
Second filter circuit, is filtered processing for the second tunnel input signal is set frequency range；Described first
The polarity of voltage of road input signal and described second tunnel input signal is contrary；Described first via input signal sets
It is identical that frequency range sets frequency range with described second tunnel input signal；
Voltage shifts circuit, is connected with described first filter circuit, for described the after filtered process
The voltage of one tunnel input signal translates so that described first via input signal and the second tunnel input after translation
The voltage difference of signal is less than the voltage of described first via input signal before translation with described second tunnel input signal
Difference；
First difference channel, is connected with described voltage shifts circuit, described second filter circuit, for warp
Described first via input signal after voltage shifts and the described second tunnel input signal after filtered process are entered
Row difference processing.
2. optical module as claimed in claim 1, it is characterised in that described first via input signal and institute
The amplitude stating the second tunnel input signal is equal；
After described first via input signal is filtered processing by described first filter circuit, the described first via is defeated
Enter signal and set the voltage attenuation of frequency range as the first amplitude；
After described second tunnel input signal is filtered processing by described second filter circuit, described second road is defeated
Enter signal and set the voltage attenuation of frequency range as the second amplitude；
The voltage of the described first via input signal after filtered process is put down by described voltage shifts circuit
After shifting, it is the 3rd amplitude by the first amplitude translation that described first via input signal sets the voltage of frequency range；
Wherein, the first amplitude is equal in magnitude with the second amplitude, opposite polarity, the second amplitude and the 3rd amplitude it
Difference is less than the difference of the second amplitude with the first amplitude.
3. optical module as claimed in claim 2, it is characterised in that the second amplitude is equal to the 3rd amplitude.
4. optical module as claimed in claim 1, it is characterised in that the described frequency range that sets is as setpoint frequency
The high-frequency signal of scope.
5. optical module as claimed in claim 1, it is characterised in that described voltage shifts circuit includes string
The first adjustable resistance, the second adjustable resistance and the 3rd adjustable resistance that connection connects；Described voltage shifts circuit leads to
Overregulate the first adjustable resistance, the second adjustable resistance and the electric resistance partial pressure parameter of the 3rd adjustable resistance, adjust
The voltage shifts amount of described first via input signal；
Wherein, the first end of the first adjustable resistance is connected with described first filter circuit, the first adjustable resistance
Second end is connected with described first differential amplifier circuit；
The first of second adjustable resistance terminates into power supply signal, the second end of the second adjustable resistance and first adjustable
Second end of resistance connects；
First end ground connection of the 3rd adjustable resistance, the second end of the 3rd adjustable resistance and the of the first adjustable resistance
One end connects.
6. optical module as claimed in claim 1, it is characterised in that described first filter circuit and described
Second filter circuit is the most anti-phase RC filter circuit, and described RC filter circuit includes being connected in parallel
Adjustable resistor and adjustable condenser, and ground capacitor.
7. optical module as claimed in claim 1, it is characterised in that described first difference channel is first
Differential amplifier circuit, described first differential amplifier circuit is additionally operable to described first via input signal and described
The voltage difference of two tunnel input signals is amplified processing.
8. the optical module as described in any one of claim 1 to 7, it is characterised in that described optical module is also
Including: optical receiver and the second differential amplifier circuit；
Described optical receiver, is used for receiving optical signal, and the optical signal of reception is converted into the signal of telecommunication, and will
The described signal of telecommunication is input to the second differential amplifier circuit according to the mode of Differential Input；
Described second differential amplifier circuit, for being amplified the first via signal of Differential Input, exports institute
State first via input signal；Second road signal of Differential Input is amplified, exports described second tunnel input
Signal.
9. optical module as claimed in claim 8, it is characterised in that the voltage pole of described first via signal
Property is just, the polarity of voltage of described second road signal is negative, or the polarity of voltage of described first via signal is
Just, the polarity of voltage of described second road signal is negative.
10. optical module as claimed in claim 9, it is characterised in that described second differential amplifier circuit is
Push-pull type differential amplifier circuit, including pushing-type amplifying circuit and the pull amplifying circuit of alternation；
Pushing-type amplifying circuit, for being amplified processing to the described first via signal of input, exports described the
One tunnel input signal；
Pull amplifying circuit, for being amplified processing to the described second road signal of input, exports described the
Two tunnel input signals.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080224759A1 (en) * | 2007-03-13 | 2008-09-18 | Analog Devices, Inc. | Low noise voltage reference circuit |
| CN104980217A (en) * | 2015-06-19 | 2015-10-14 | 邹骁 | Visible light communication system and method, and associated device |
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2016
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080224759A1 (en) * | 2007-03-13 | 2008-09-18 | Analog Devices, Inc. | Low noise voltage reference circuit |
| CN101657775A (en) * | 2007-03-13 | 2010-02-24 | 模拟装置公司 | Low noise voltage reference circuit |
| CN104980217A (en) * | 2015-06-19 | 2015-10-14 | 邹骁 | Visible light communication system and method, and associated device |
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