CN205670806U - A kind of optical receiver module - Google Patents
A kind of optical receiver module Download PDFInfo
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- CN205670806U CN205670806U CN201620486699.1U CN201620486699U CN205670806U CN 205670806 U CN205670806 U CN 205670806U CN 201620486699 U CN201620486699 U CN 201620486699U CN 205670806 U CN205670806 U CN 205670806U
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Abstract
This utility model relates to a kind of optical receiver module, including low noise trans-impedance amplifier, attenuator and out amplifier: the input of fully integrated optical receiver module is inputted by photodiode signal, the outfan of low noise trans-impedance amplifier connects the input of attenuator, the outfan of attenuator connects the input of out amplifier, and the outfan of out amplifier carries out signal output.Advantage of the present utility model is embodied in: whole module is made up of a single-chip, greatly reduces the cost of module, simplifies design, module more miniaturization, it is easier to embed in the middle of other system, it is achieved total solution.
Description
Technical field
This utility model relates to photoreceiver technical field, is specifically related to a kind of optical receiver module.
Background technology
Cable television photo-receiver is all important composition in fiber optic network (i.e. HFC) and fiber to the home (i.e. FTTH) are applied
One of part.Cable television photo-receiver is made up of two parts: 1. opto-electronic conversion diode.2. Optical Receivers.
The optical receiver module structure the most generally used is as shown in Figure 1.Optical receiver module is made up of five parts:
Distribution road, low-noise amplifier, attenuator, driving amplifier and impedance transformation transformator.The input termination photoelectricity of match circuit
The output of diode, the input of the output termination low-noise amplifier of match circuit, the output termination of low-noise amplifier declines
Subtract the input of device, the input of the output termination driving amplifier of attenuator, the output termination impedance transformation of driving amplifier
The input of transformator, last signal is exported by the outfan of impedance transformer.The most integrated optical receiver module is by low noise
Acoustic amplifier, attenuator and driving amplifier are integrated on a single-chip.The input of the low-noise amplifier in existing module
Impedance is generally at 50 ohm or 75 ohm, and the output impedance of photodiode is at 400 ohm, so needing at photodiode
Outfan and the input of low-noise amplifier between add an impedance matching circuit, carry out the coupling of impedance.Impedance matching
Circuit is generally made up of inductance, electric capacity and resistance, typically can not be integrated in chip, it is necessary to real by single discrete component
Existing.
In order to improve the signal to noise ratio of Optical Receivers, improve receiving sensitivity and MER index, Optical Receivers typically uses
Differential Input, but the output of Optical Receivers is Single-end output, so difference to be carried out becomes single before final signal exports
The conversion of end.The method connecing impedance conversion transformer is all used to realize the conversion that difference becomes single-ended at present.
Owing to match circuit and impedance conversion transformer cannot realize integrated in current Optical Receivers, add design
Complexity, and manufacturing cost.
Utility model content
The purpose of this utility model is for deficiency of the prior art, proposes a kind of fully integrated Optical Receivers, adopts
By brand-new structure and design, eliminate match circuit and impedance conversion transformer, it is achieved that the complete or collected works of Optical Receivers
Become.
For achieving the above object, the utility model discloses following technical scheme:
A kind of optical receiver module fully integrated based on GaAs pHEMT (counterfeit HEMT) technique, bag
Include low noise trans-impedance amplifier, attenuator and out amplifier:
Described low noise trans-impedance amplifier is made up of two independent amplifying units, forms Differential Input and difference output,
Having individual feedback resistance RF between input and the output of each amplifying unit, the two amplifying unit structure is identical, by putting inside it
Big level, output stage and corresponding biasing circuit are constituted；
Described attenuator is made up of N number of attenuation units, and each attenuation units is made up of a resistance and a pHEMT pipe,
The two ends of resistance are connected across between the source electrode of pHEMT pipe and drain electrode, and the grid of pHEMT pipe connects control signal, and N number of attenuation units is again
Attenuator is formed by serial or parallel connection；
Described out amplifier is made up of differential input end, the active load of differential input end, current source and output stage；Difference
The positive pole of point input and negative pole are connected respectively to the grid of two pHEMT pipes, and the source electrode of the two Differential Input pHEMT pipe is even
Together, connect the input of current source, the output head grounding of current source；The drain electrode of Differential Input pHEMT pipe connects one respectively
PHEMT manages, and this pHEMT pipe is as the active load of Differential Input pHEMT pipe；Two pHEMT as active load manage, they
Drain electrode connect together, receive power supply；Their grid connects together, and their source electrode is coupled with two Differential Input
The drain electrode of pHEMT pipe；Grid and the source electrode of one of them active load pHEMT pipe connect together, another active load pHEMT
The source electrode of pipe connects the grid of output pHEMT pipe；The drain electrode of output pHEMT pipe connects power supply, and the source electrode of output pHEMT pipe connects load electricity
One end of resistance, the other end ground connection of load resistance；
The input of described fully integrated optical receiver module is inputted by photodiode signal, low noise trans-impedance amplifier
Outfan connect the input of attenuator, the outfan of attenuator connects the input of out amplifier, out amplifier
Outfan carries out signal output.
Further, the amplifier stage of described amplifying unit circuit is by pHEMT pipe M1, pHEMT pipe M2, resistance R1 and resistance R2
Constitute；Output stage is made up of pHEMT pipe M3 and load resistance RL, and biasing circuit provides the bias voltage of M1 and M2.
Further, described out amplifier is formed differential input end by pHEMT pipe M4, pHEMT pipe M5, pHEMT pipe M6,
M7 composition pHEMT pipe M4, M5 active load, wherein grid and the source electrode of M6 is linked together, current source provide M4, M5, M6,
The static working current of M7；The circuit realiration differential signal of M4, M5, M6 and M7 composition becomes the conversion of single-ended signal；pHEMT
Pipe M8 and load resistance RL forms output stage；The grid of M4, M5 connects positive pole and the negative pole of differential input end, the source of M4, M5 respectively
Pole connects together, and connects the input of current source, the output head grounding of current source；The drain electrode of M4, M5 connects the source electrode of M6, M7 respectively,
The drain electrode of M6, M7 connects together, and connects power supply；The grid of M6, M7 connects together, and grid and the source electrode of M6 connect together, the source of M7
Pole connects the grid of M8；The drain electrode of M8 connects power supply, and the source electrode of M8 connects load resistance RL one end, the other end ground connection of load resistance RL.
Disclosed in this utility model, a kind of optical receiver module, has the advantages that
Whole module is made up of a single-chip, greatly reduces the cost of module, simplifies design, and module is more small-sized
Change, it is easier to embed in the middle of other system, it is achieved total solution.
Accompanying drawing explanation
Fig. 1 is optical receiver module structure chart of the prior art；
Fig. 2 is the structure chart of the optical receiver module that the utility model proposes；
Fig. 3 is low noise trans-impedance amplifier schematic diagram；
Fig. 4 is low noise trans-impedance amplifier amplifying unit circuit diagram；
Fig. 5 is attenuator structure figure；
Fig. 6 is the structure chart of out amplifier；
Fig. 7 is the conversion curve that the gain of the fully integrated module that the utility model proposes controls voltage with attenuator；
Fig. 8 is low noise trans-impedance amplifier noise coefficient；
Fig. 9 is that low noise trans-impedance amplifier inputs return loss coefficient；
Figure 10 is a fully integrated module output return loss coefficient；
Detailed description of the invention
Below in conjunction with embodiment and referring to the drawings this utility model is further described.
Refer to Fig. 2.The utility model proposes is complete based on GaAs pHEMT (counterfeit HEMT) technique
Integrated optical receiver module, including low noise trans-impedance amplifier, attenuator and out amplifier:
Described low noise trans-impedance amplifier is made up of two independent amplifying units, forms Differential Input and difference output,
Differential Input, output can improve the MER index of Optical Receivers.A feedback is had between input and the output of each amplifying unit
Resistance RF, introduces feedback resistance and can improve the noise objective of amplifier, improve receiving sensitivity.Referring to Fig. 3, the two is put
Big unit structure is identical, is made up of amplifier stage, output stage and corresponding biasing circuit inside it；
In Fig. 2, the effect of attenuator is the gain being automatically adjusted Optical Receivers according to photoelectric diode output size.
Seeing Fig. 5, attenuator is made up of N number of attenuation units, and each attenuation units is made up of a resistance and a pHEMT pipe, resistance
Two ends are connected across between the source electrode of pHEMT pipe and drain electrode, and the grid of pHEMT pipe connects control signal, a resistance and a pHEMT
Constituting one-level attenuation units, N number of attenuation units forms attenuator by serial or parallel connection again；The dynamic range of accommodation of attenuator and
N is relevant, and usual N is the biggest, and the dynamic range of accommodation of attenuator is the biggest.According to the requirement of design, the control signal of attenuator is permissible
It is voltage control signal or digital controlled signal.
Out amplifier effect in Fig. 2 is the drive amplification realizing signal, differential signal is become single-ended signal simultaneously,
And realize exporting impedance transformation.Out amplifier is by differential input end, the active load of differential input end, current source and output stage
Constitute；The positive pole of differential input end and negative pole are connected respectively to the grid of two pHEMT pipes, and the two Differential Input pHEMT manages
Source electrode connect together, connect the input of current source, the output head grounding of current source；The drain electrode of Differential Input pHEMT pipe is respectively
Connecing a pHEMT pipe, this pHEMT pipe is as the active load of Differential Input pHEMT pipe；Two pHEMT as active load
Pipe, their drain electrode connects together, and receives power supply；Their grid connects together, and their source electrode is coupled with two difference
The drain electrode of input pHEMT pipe；Grid and the source electrode of one of them active load pHEMT pipe connect together, another active load
The source electrode of pHEMT pipe connects the grid of output pHEMT pipe；The drain electrode of output pHEMT pipe connects power supply, and the source electrode of output pHEMT pipe connects
One end of load resistance, the other end ground connection of load resistance；
The input of described fully integrated optical receiver module is inputted by photodiode signal, low noise trans-impedance amplifier
Outfan connect the input of attenuator, the outfan of attenuator connects the input of out amplifier, out amplifier
Outfan carries out signal output.
Seeing Fig. 4, as a kind of specific embodiment, the amplifier stage of described amplifying unit circuit is managed by pHEMT pipe M1, pHEMT
M2, resistance R1 and resistance R2 are constituted；Output stage is made up of pHEMT pipe M3 and load resistance RL, and biasing circuit provides M1's and M2
Bias voltage.By the adjustment of amplifying unit internal circuit configuration parameter, can be by the input impedance matching of amplifier to photoelectricity
Diode output impedance, thus can remove original at match circuit.
Seeing Fig. 6, as a kind of specific embodiment, described out amplifier is formed difference by pHEMT pipe M4, pHEMT pipe M5
Input, the active load of pHEMT pipe M6, M7 composition pHEMT pipe M4, M5, wherein grid and the source class of M6 is linked together, electricity
Stream source provides the static working current of M4, M5, M6, M7；The circuit realiration differential signal of M4, M5, M6 and M7 composition becomes single
The conversion of end signal；PHEMT pipe M8 and load resistance RL composition output stage can regulate the resistance of RL and realize output impedance matching；
The grid of M4, M5 connects positive pole and the negative pole of differential input end respectively, and the source electrode of M4, M5 connects together, and connects the input of current source,
The output head grounding of current source；The drain electrode of M4, M5 connects the source electrode of M6, M7 respectively, and the drain electrode of M6, M7 connects together, and connects power supply；
The grid of M6, M7 connects together, and grid and the source electrode of M6 connect together, and the source electrode of M7 connects the grid of M8；The drain electrode of M8 connects power supply,
The source electrode of M8 connects load resistance RL one end, the other end ground connection of load resistance RL.The output that the utility model proposes is used to amplify
Device can save impedance conversion transformer of the prior art, greatly reduces cost, simplifies design.
Fig. 7 is the curve that the gain of the fully integrated module that the utility model proposes converts with frequency input signal, the most also
Give the conversion curve that gain controls voltage with attenuator.Experiment have employed the control voltage of 0-3V, wherein 0V minimal attenuation
Controlling voltage, 3V is that maximum attenuation controls voltage.Fig. 8 is low noise trans-impedance amplifier noise coefficient, and Fig. 9 low noise amplifies across resistance
Device input return loss coefficient, input impedance is to match prime photodiode common output impedance 200 ohm.Figure 10 is this reality
Exporting return loss coefficient by the fully integrated module of novel proposition, output impedance is to match the output impedance of 75 ohm.From Fig. 9 and Tu
10 it can be seen that the fully integrated module that the utility model proposes the most well achieves impedance matching, it is not necessary to light in prior art
Match circuit between electricity diode and receiver module, and output impedance conversion transformer.
The above is only preferred implementation of the present utility model, is not intended to limit；Although it should be pointed out that, with reference to upper
Stating each embodiment to be described in detail this utility model, it will be understood by those within the art that, it is the most permissible
Technical scheme described in the various embodiments described above is modified, or the most some or all of technical characteristic is carried out equivalent replaces
Change；And these amendments and replacement, do not make the essence of corresponding technical scheme depart from this utility model each embodiment technical scheme
Scope.
Claims (3)
1. an optical receiver module, it is characterised in that include low noise trans-impedance amplifier, attenuator and out amplifier:
Described low noise trans-impedance amplifier is made up of two independent amplifying units, forms Differential Input and difference output, each
Having individual feedback resistance RF between the input of amplifying unit and output, the two amplifying unit structure is identical, inside it by amplifier stage,
Output stage and corresponding biasing circuit are constituted；
Described attenuator is made up of N number of attenuation units, and each attenuation units is made up of a resistance and a pHEMT pipe, resistance
Two ends be connected across pHEMT pipe source electrode and drain electrode between, the grid of pHEMT pipe connects control signal, and N number of attenuation units is passed through again
Serial or parallel connection composition attenuator；
Described out amplifier is made up of differential input end, the active load of differential input end, current source and output stage；Difference is defeated
The positive pole and the negative pole that enter end are connected respectively to the grid of two pHEMT pipes, and the source electrode of the two Differential Input pHEMT pipe is connected in one
Rise, connect the input of current source, the output head grounding of current source；The drain electrode of Differential Input pHEMT pipe meets a pHEMT respectively
Pipe, this pHEMT pipe is as the active load of Differential Input pHEMT pipe；Two pHEMT as active load manage, their leakage
Pole connects together, and receives power supply；Their grid connects together, and their source electrode is coupled with two Differential Input pHEMT pipes
Drain electrode；Grid and the source electrode of one of them active load pHEMT pipe connect together, the source of another active load pHEMT pipe
Pole connects the grid of output pHEMT pipe；The drain electrode of output pHEMT pipe connects power supply, and the source electrode of output pHEMT pipe connects the one of load resistance
End, the other end ground connection of load resistance；
The input of described fully integrated optical receiver module is inputted by photodiode signal, low noise trans-impedance amplifier defeated
Going out end and connect the input of attenuator, the outfan of attenuator connects the input of out amplifier, the output of out amplifier
End carries out signal output.
A kind of optical receiver module the most according to claim 1, it is characterised in that the amplifier stage of described amplifying unit circuit
It is made up of pHEMT pipe M1, pHEMT pipe M2, resistance R1 and resistance R2；Output stage is made up of, partially pHEMT pipe M3 and load resistance RL
Circuits provides the bias voltage of M1 and M2.
A kind of optical receiver module the most according to claim 1, it is characterised in that described out amplifier is managed by pHEMT
M4, pHEMT pipe M5 forms differential input end, the active load of pHEMT pipe M6, M7 composition pHEMT pipe M4, M5, the wherein grid of M6
Pole and source electrode are linked together, and current source provides the static working current of M4, M5, M6, M7；The circuit of M4, M5, M6 and M7 composition
Achieve differential signal and become the conversion of single-ended signal；PHEMT pipe M8 and load resistance RL forms output stage；The grid of M4, M5
Connecing positive pole and the negative pole of differential input end respectively, the source electrode of M4, M5 connects together, and connects the input of current source, current source defeated
Go out to hold ground connection；The drain electrode of M4, M5 connects the source electrode of M6, M7 respectively, and the drain electrode of M6, M7 connects together, and connects power supply；The grid of M6, M7
Connecting together, grid and the source electrode of M6 connect together, and the source electrode of M7 connects the grid of M8；The drain electrode of M8 connects power supply, and the source electrode of M8 connects
Load resistance RL one end, the other end ground connection of load resistance RL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620486699.1U CN205670806U (en) | 2016-05-25 | 2016-05-25 | A kind of optical receiver module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620486699.1U CN205670806U (en) | 2016-05-25 | 2016-05-25 | A kind of optical receiver module |
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| CN205670806U true CN205670806U (en) | 2016-11-02 |
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| CN201620486699.1U Active CN205670806U (en) | 2016-05-25 | 2016-05-25 | A kind of optical receiver module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105847733A (en) * | 2016-05-25 | 2016-08-10 | 北京中电宏业科技有限公司 | Totally-integrated optical receiver module |
| CN108111145A (en) * | 2018-02-10 | 2018-06-01 | 北京工业大学 | A kind of attenuator |
| CN108199694A (en) * | 2018-01-19 | 2018-06-22 | 厦门优迅高速芯片有限公司 | A kind of auto gain control method and circuit that can be applied to burst trans-impedance amplifier |
-
2016
- 2016-05-25 CN CN201620486699.1U patent/CN205670806U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105847733A (en) * | 2016-05-25 | 2016-08-10 | 北京中电宏业科技有限公司 | Totally-integrated optical receiver module |
| CN105847733B (en) * | 2016-05-25 | 2019-01-11 | 北京中电宏业科技有限公司 | A kind of fully integrated optical receiver module |
| CN108199694A (en) * | 2018-01-19 | 2018-06-22 | 厦门优迅高速芯片有限公司 | A kind of auto gain control method and circuit that can be applied to burst trans-impedance amplifier |
| WO2019140741A1 (en) * | 2018-01-19 | 2019-07-25 | 厦门优迅高速芯片有限公司 | Automatic gain control method and circuit applicable in burst transimpedance amplifier |
| CN108111145A (en) * | 2018-02-10 | 2018-06-01 | 北京工业大学 | A kind of attenuator |
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