CN108469868A - Temperature self-adaptation current source and optical module - Google Patents
Temperature self-adaptation current source and optical module Download PDFInfo
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- CN108469868A CN108469868A CN201810579745.6A CN201810579745A CN108469868A CN 108469868 A CN108469868 A CN 108469868A CN 201810579745 A CN201810579745 A CN 201810579745A CN 108469868 A CN108469868 A CN 108469868A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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Abstract
The invention discloses a kind of temperature self-adaptation current source and optical module, the temperature self-adaptation current source includes proportion current source, thermistor, power end, input terminal and output end；The proportion current source includes reference current branch and output current branch, and the thermistor is connected in the reference current branch or is connected in the output current branch；One end of the reference current branch connects the input terminal and suitable for receiving the feedback current from optical assembly, one end of the output current branch connects the output end and suitable for exporting sample rate current to the driving chip of the optical assembly, the sample rate current and temperature positive correlation, the other end of the reference current branch connect the power end with the other end of the output current branch.Temperature self-adaptation current source and optical module provided by the invention can avoid the occurrence of the problem of high temperature leads to the increase of optical module power consumption, the lost of life and communication disruption.
Description
Technical field
The present invention relates to technical field of photo communication, and in particular to a kind of temperature self-adaptation current source and optical module.
Background technology
It is currently being widely used optical module, the bias current of driving chip output is to laser diode (LD, Laser
Diode the close-loop driven pattern of Automatic optical power control (APC, Automatic Power Control)) is all used substantially, i.e.,
Configuration driven chip at normal temperatures makes laser diode emit luminous power in some definite value.General optical assembly, such as bi-directional light
Component (BOSA, Bi-directional Optical Sub-Assembly), is not provided only with laser diode, is also provided with
Backlight diode (MPD, Monitor Photodiode).The transmitting luminous power that backlight diode is used to monitor laser diode is big
It is small, transmitting optical signal is converted to current signal and is supplied to driving chip, to inform the reality of driving chip laser diode at this time
Border emits luminous power size.Driving chip responds according to this, adjusts the bias current size of its output, realizes auto light power
Control function, to make the actual transmission luminous power of laser diode as temperature change keeps dynamic stability.
With the raising of temperature, optical module is in order to keep identical transmitting luminous power, driving chip under room temperature to need to increase
Big bias current, while increasing modulation electric current so that transmitting optical signal keeps extinction ratio appropriate.However, due to bias current and
It modulates electric current to increase, optical module is faced with following three problem：Optical module overall power increases, and own temperature becomes higher；By
Become higher in own temperature, temperature raising, bias current and the increase of modulation electric current, power consumption increase, temperature higher may be absorbed in
Endless loop, laser diode is operated in nonlinear area, until breaking through the work upper limit of laser diode, leads to communication quality
Decline phenomena such as even interrupting；Laser diode reduced performance, the lost of life.
Invention content
To be solved by this invention is that high temperature causes optical module power consumption to increase, the lost of life and communication quality decline even
The problem of interruption.
The present invention is achieved through the following technical solutions：
A kind of temperature self-adaptation current source, including proportion current source, thermistor, power end, input terminal and output end；
The proportion current source includes reference current branch and output current branch, and the thermistor is connected on the base
In quasi- current branch or it is connected in the output current branch；
One end of the reference current branch connects the input terminal and suitable for receiving the feedback current from optical assembly, institute
The one end for stating output current branch connects the output end and suitable for exporting sample rate current, institute to the driving chip of the optical assembly
Sample rate current and temperature positive correlation are stated, the other end of the reference current branch is connected with the other end of the output current branch
The power end.
Optionally, the power end is suitable for receiving supply voltage, and the output current branch includes first resistor and first
PNP triode, the reference current branch include second resistance and the second PNP triode；
The other end of the other end of the one end of the first resistor as the output current branch, the first resistor connects
The emitter of first PNP triode is connect, the base stage of first PNP triode connects the base of second PNP triode
The collector of pole and second PNP triode, the collector of first PNP triode is as the output current branch
One end；
The other end of the other end of the one end of the second resistance as the reference current branch, the second resistance connects
Connect the emitter of second PNP triode, the collector of second PNP triode as the reference current branch one
End.
Optionally, the thermistor is the thermistor of negative temperature coefficient and the thermistor is connected on the output
In current branch；Alternatively, the thermistor is the thermistor of positive temperature coefficient and the thermistor is connected on the base
In quasi- current branch.
Optionally, the thermistor is the thermistor of negative temperature coefficient；
The thermistor is connected between the power end and one end of the first resistor or the thermistor
It is connected between the other end of the first resistor and the emitter of first PNP triode.
Optionally, the thermistor is the thermistor of positive temperature coefficient；
The thermistor is connected between the power end and one end of the second resistance or the thermistor
It is connected between the other end of the second resistance and the emitter of second PNP triode.
Optionally, the power end ground connection, the output current branch includes first resistor and the first NPN triode, institute
It includes second resistance and the second NPN triode to state reference current branch；
The other end of the other end of the one end of the first resistor as the output current branch, the first resistor connects
The emitter of first NPN triode is connect, the base stage of first NPN triode connects the base of second NPN triode
The collector of pole and second NPN triode, the collector of first NPN triode is as the output current branch
One end；
The other end of the other end of the one end of the second resistance as the reference current branch, the second resistance connects
Connect the emitter of second NPN triode, the collector of second NPN triode as the reference current branch one
End.
Optionally, the thermistor is the thermistor of negative temperature coefficient and the thermistor is connected on the output
In current branch；Alternatively, the thermistor is the thermistor of positive temperature coefficient and the thermistor is connected on the base
In quasi- current branch.
Optionally, the thermistor is the thermistor of negative temperature coefficient；
The thermistor is connected between the power end and one end of the first resistor or the thermistor
It is connected between the other end of the first resistor and the emitter of first NPN triode.
Optionally, the thermistor is the thermistor of positive temperature coefficient；
The thermistor is connected between the power end and one end of the second resistance or the thermistor
It is connected between the other end of the second resistance and the emitter of second NPN triode.
The present invention also provides a kind of optical modules, including optical assembly, driving chip and above-mentioned temperature self-adaptation current source；
The optical assembly is used under the driving of bias current and modulation electric current generate transmitting light, and detects the transmitting light
Watt level exports the feedback current；
The temperature self-adaptation current source is for receiving the feedback current, and to the feedback current scaling transformation,
Export the sample rate current；
The driving chip, according to the sample rate current size, exports the biasing for receiving the sample rate current
Electric current and the modulation electric current.
Compared with prior art, the present invention having the following advantages and advantages：
It is different to driving chip from existing optical assembly static output feedback electric current, temperature self-adaptation electric current provided by the invention
The temperature self-adaptation current source, proportion of utilization current source pair is arranged in source and optical module between optical assembly and driving chip
The feedback current of optical assembly output carries out mirror image, to export sample rate current to the driving chip of the optical assembly.By described
Series thermal-sensitive resistance in the reference current branch or output current branch of proportion current source, realizes the sample rate current and temperature
Positive correlation makes the driving chip adjust the transmitting luminous power size of optical assembly according to the sample rate current, and then reduces high temperature
Under transmitting luminous power, avoid the occurrence of high temperature cause optical module power consumption to increase, the lost of life and the problem of communication disruption, improve
Transmitting luminous power under low temperature avoids causing chip processing performance to decline since the bias current and modulation electric current of needs are too low,
To avoid generating data communications errors or other exceptions.
Further, compared with increasing cooling fin, semiconductor cooler or external fan in optical module, the present invention provides
Temperature self-adaptation current source and optical module, directly under high temperature environment reduce transmitting luminous power, to reduce optical module
Power consumption then reduces the temperature of optical module itself, can optimize high-temperature behavior；Temperature self-adaptation current source provided by the invention with
And optical module, carried out automatically controlling using hardware circuit sense ambient temperature, without APC temperature lookup tables, because without
Increase cumbersome temperature acquisition and data handling procedure, greatlys save manpower and time cost；With transmitting light is turned down under room temperature
Power is compared with improving high-temperature behavior, and temperature self-adaptation current source and optical module provided by the invention are promoting high-temperature behavior
Meanwhile emitting luminous power in low temperature environment with respect to height under room temperature, i.e. bias current and modulation electric current drives laser diode
It is operated in linear region, the reliability of laser diode work is improved, avoids too low bias current that from can not opening two pole of laser
Pipe avoids causing chip processing performance to decline since the bias current and modulation electric current of needs are too low, to avoid generating data
Communications errors or other exceptions；With poll optical mode deblocking temperature and bias current, using MCU and software control transmitting luminous power phase
Than temperature self-adaptation current source and optical module provided by the invention are made of a small number of discrete components, and cloth plate suqare is small, cost
It is low, and hardware automatically controls, and saves software translating and debugging process.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the circuit diagram of the temperature self-adaptation current source of an embodiment of the present invention；
Fig. 2 is the circuit diagram of the temperature self-adaptation current source of another embodiment of the invention；
Fig. 3 is the circuit diagram of the temperature self-adaptation current source of another embodiment of the invention；
Fig. 4 is the circuit diagram of the temperature self-adaptation current source of another embodiment of the invention；
Fig. 5 is the circuit diagram of the temperature self-adaptation current source of another embodiment of the invention；
Fig. 6 is the circuit diagram of the temperature self-adaptation current source of another embodiment of the present invention；
Fig. 7 is the circuit diagram of the temperature self-adaptation current source of another embodiment of the present invention；
Fig. 8 is the circuit diagram of the temperature self-adaptation current source of another embodiment of the present invention；
Fig. 9 is the electrical block diagram of the optical module of the embodiment of the present invention.
Specific implementation mode
The present invention provides a kind of temperature self-adaptation current source, the feedback current that optical assembly is exported using proportion current source into
Row mirror image to export sample rate current to the driving chip of the optical assembly, and passes through the reference current in the proportion current source
Series thermal-sensitive resistance in branch or output current branch, realizes the sample rate current and temperature positive correlation, to reduce high temperature
Under transmitting luminous power, improve low temperature under transmitting luminous power.Specifically, the temperature self-adaptation current source includes proportional current
Source, thermistor, power end, input terminal and output end.The proportion current source includes reference current branch and output current
Branch, the thermistor are connected in the reference current branch or are connected in the output current branch；The base
One end of quasi- current branch connects the input terminal and suitable for receiving the feedback current from optical assembly, the output current branch
One end connect the output end and suitable for exporting sample rate current, the sample rate current and temperature to the driving chip of the optical assembly
Positive correlation is spent, the other end of the reference current branch connects the power end with the other end of the output current branch.
To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1
The present embodiment provides a kind of temperature self-adaptation current source, Fig. 1 is the circuit diagram of the temperature self-adaptation current source, institute
It includes proportion current source, thermistor R to state temperature self-adaptation current sourceNTC, power end, input terminal IPD and output end IMPD.
Specifically, the proportion current source includes reference current branch and output current branch, the thermistor RNTCString
It is associated in the reference current branch or is connected in the output current branch；One end of the reference current branch connects
The input terminal IPD simultaneously is suitable for receiving the feedback current I from optical assemblyPD, the output current branch one end connection described in
Output end IMPD is simultaneously suitable for the driving chip of optical assembly output sample rate current IMPD, the sample rate current IMPDJust with temperature
Correlation, i.e. temperature sample rate current I when increasingMPDIncrease, temperature sample rate current I when reducingMPDReduce, the benchmark electricity
The other end of stream branch connects the power end with the other end of the output current branch.
In the present embodiment, the power end is suitable for receiving supply voltage VCC, and the output current branch includes the first electricity
It includes second resistance R2 and the second PNP triode Q2 to hinder R1 and the first PNP triode Q1, the reference current branch.Described
One end of the other end of the one end of one resistance R1 as the output current branch, i.e., the described first resistor R1 connects the power supply
End, the other end of the first resistor R1 connect the emitter of the first PNP triode Q1, the first PNP triode Q1
Base stage connect the second PNP triode Q2 base stage and the second PNP triode Q2 collector, the first PNP
The one end of the collector of triode Q1 as the output current branch, i.e., the collector connection of the described first PNP triode Q1
The output end IMPD；The other end of the one end of the second resistance R2 as the reference current branch, i.e., described second electricity
The one end for hindering R2 connects the power end, and the other end of the second resistance R2 connects the transmitting of the second PNP triode Q2
Pole, the one end of the collector of the second PNP triode Q2 as the reference current branch, i.e., described second PNP triode
The collector of Q2 connects the input terminal IPD.
Further, the thermistor RNTCIt is connected in the output current branch, and the thermistor RNTCIt is negative
The thermistor of temperature coefficient.In the present embodiment, the thermistor RNTCIt is connected on the power end and the first resistor
Between one end of R1, i.e., one end of the described first resistor R1 passes through the thermistor RNTCConnect the power end.Certainly, institute
State thermistor RNTCThe emitter of the other end and the first PNP triode Q1 of the first resistor R1 can also be connected on
Between, i.e., the other end of the described first resistor R1 passes through the thermistor RNTCConnect the transmitting of the first PNP triode Q1
Pole, as shown in Figure 2.
Temperature self-adaptation current source provided in this embodiment flows through the sample rate current I of the output current branchMPDWith stream
Cross the feedback current I of the reference current branchPDProportional variation, and have：
Under room temperature, the transmitting luminous power of the optical assembly is arranged in certain certain value, institute by configuring the driving chip
It states optical assembly and detects transmitting luminous power, and be converted to the feedback current IPD, the temperature self-adaptation that provides through this embodiment
Current source is to the feedback current IPDCarry out ratio variation obtains the sample rate current IMPD, and by the sample rate current IMPDIt carries
The driving chip is supplied, the driving chip is according to the sample rate current IMPDSize confirms the practical hair of the optical assembly at this time
The size of luminous power is penetrated, and then adjusts bias current and modulation electric current, realizes transmitting luminous power dynamic stability.
Due to the thermistor RNTCIn negative temperature coefficient feature, with the raising of temperature, the thermistor RNTC's
Resistance value reduces, then the sample rate current IMPDIncrease, feed back to the driving chip, the driving chip thinks described at this time
Optical assembly actual transmission luminous power becomes larger, thus reduces bias current and modulation electric current, reduces the transmitting light of the optical assembly
Power, to reduce the temperature of entire optical module.On the contrary, with the reduction of temperature, the thermistor RNTCResistance value become
Greatly, then the sample rate current IMPDReduce, feeds back to the driving chip, the driving chip thinks the optical assembly at this time
Actual transmission luminous power becomes smaller, thus increases bias current and modulation electric current, and laser diode is avoided to be operated in threshold limit value
It puts and can not open, be also prevented from the driving chip and be operated in bias current and modulate the lower limit of electric current output, improve entire light
The reliability of module work.
Embodiment 2
The present embodiment provides a kind of temperature self-adaptation current source, Fig. 3 is the circuit diagram of the temperature self-adaptation current source.With
The temperature self-adaptation current source that embodiment 1 provides is compared, difference lies in：Thermistor RPTCIt is connected on the reference current branch
In, and the thermistor RPTCFor the thermistor of positive temperature coefficient.
In the present embodiment, the thermistor RPTCBe connected on the power end and the second resistance R2 one end it
Between, i.e., one end of the described second resistance R2 passes through the thermistor RPTCConnect the power end.Certainly, the thermistor
RPTCIt can also be connected between the other end of the second resistance R2 and the emitter of the second PNP triode Q2, i.e., it is described
The other end of second resistance R2 passes through the thermistor RPTCThe emitter for connecting the second PNP triode Q2, such as Fig. 4 institutes
Show.
Temperature self-adaptation current source provided in this embodiment flows through the sample rate current I of the output current branchMPDWith stream
Cross the feedback current I of the reference current branchPDProportional variation, and have：
Due to the thermistor RPTCIn ptc characteristics, with the raising of temperature, the thermistor RPTC's
Resistance value increases, then the sample rate current IMPDIncrease, feed back to the driving chip, the driving chip thinks described at this time
Optical assembly actual transmission luminous power becomes larger, thus reduces bias current and modulation electric current, reduces the transmitting light of the optical assembly
Power, to reduce the temperature of entire optical module.On the contrary, with the reduction of temperature, the thermistor RPTCResistance value subtract
It is small, then the sample rate current IMPDReduce, feeds back to the driving chip, the driving chip thinks the optical assembly at this time
Actual transmission luminous power becomes smaller, thus increases bias current and modulation electric current, and laser diode is avoided to be operated in threshold limit value
It puts and can not open, be also prevented from the driving chip and be operated in bias current and modulate the lower limit of electric current output, improve entire light
The reliability of module work.
Embodiment 3
The present embodiment provides a kind of temperature self-adaptation current source, Fig. 5 is the circuit diagram of the temperature self-adaptation current source.With
The temperature self-adaptation current source that embodiment 1 provides is compared, difference lies in：The power end ground connection, the output current branch packet
First resistor R1 and the first NPN triode Q1 are included, the reference current branch includes second resistance R2 and the second NPN triode
Q2。
Specifically, the other end of the one end of the first resistor R1 as the output current branch, i.e., described first electricity
The one end for hindering R1 connects the power end, and the other end of the first resistor R1 connects the transmitting of first NPN triode Q1
The base stage of pole, first NPN triode Q1 connects the base stage of the second NPN triode Q2 and second NPN triode
The collector of Q2, the one end of the collector of first NPN triode Q1 as the output current branch, i.e., described first
The collector of NPN triode Q1 connects the output end IMPD；One end of the second resistance R2 is as the reference current branch
One end of the other end on road, i.e., the described second resistance R2 connects the power end, and the other end of the second resistance R2 connects institute
State the emitter of the second NPN triode Q2, the collector of the second NPN triode Q2 as the reference current branch one
The collector at end, i.e., the described second NPN triode Q2 connects the input terminal IPD.
Further, the thermistor RNTCIt is connected in the output current branch, and the thermistor RNTCIt is negative
The thermistor of temperature coefficient.In the present embodiment, the thermistor RNTCIt is connected on the power end and the first resistor
Between one end of R1, i.e., one end of the described first resistor R1 passes through the thermistor RNTCConnect the power end.Certainly, institute
State thermistor RNTCThe emitter of the other end and first NPN triode Q1 of the first resistor R1 can also be connected on
Between, i.e., the other end of the described first resistor R1 passes through the thermistor RNTCConnect the transmitting of first NPN triode Q1
Pole, as shown in Figure 6.
The operation principle of temperature self-adaptation current source provided in this embodiment can refer to the description of embodiment 1, herein no longer
It repeats.
Embodiment 4
The present embodiment provides a kind of temperature self-adaptation current source, Fig. 7 is the circuit diagram of the temperature self-adaptation current source.With
The temperature self-adaptation current source that embodiment 3 provides is compared, difference lies in：Thermistor RPTCIt is connected on the reference current branch
In, and the thermistor RPTCFor the thermistor of positive temperature coefficient.
In the present embodiment, the thermistor RPTCBe connected on the power end and the second resistance R2 one end it
Between, i.e., one end of the described second resistance R2 passes through the thermistor RPTCConnect the power end.Certainly, the thermistor
RPTCIt can also be connected between the other end of the second resistance R2 and the emitter of the second NPN triode Q2, i.e., it is described
The other end of second resistance R2 passes through the thermistor RPTCThe emitter for connecting the second NPN triode Q2, such as Fig. 8 institutes
Show.
The operation principle of temperature self-adaptation current source provided in this embodiment can refer to the description of embodiment 2, herein no longer
It repeats.
Embodiment 5
The present embodiment provides a kind of optical module, Fig. 9 is the electrical block diagram of the optical module.The optical module includes
Optical assembly, driving chip and temperature self-adaptation current source, wherein the temperature self-adaptation current source is embodiment 1 to implementation
The temperature self-adaptation current source of 4 any embodiment of example description.
Specifically, the optical assembly is used under the driving of bias current and modulation electric current generate transmitting light, and detects institute
Transmitting luminous power size is stated, the feedback current I is exportedPD.The optical assembly can be bi-directional light component, including transmitting optical assembly
With reception optical assembly.Backlight diode in the transmitting optical assembly is used to monitor the transmitting luminous power size of laser diode,
And transmitting luminous power is converted into the feedback current IPD。
The temperature self-adaptation current source is for receiving the feedback current IMPD, and the feedback current is become in proportion
It changes, exports the sample rate current IMPD, i.e., the described temperature self-adaptation current source is by the input terminal IPD receptions feedback current
IMPD, the sample rate current I is exported by the output end IMPDMPD。
The driving chip is for receiving the sample rate current IMPD, and according to the sample rate current IMPDSize exports institute
State bias current and the modulation electric current.The driving chip is for providing bias current and modulation electric current to drive the light group
Laser diode in part emits optical signal, according to the sample rate current IMPDConfirm the optical assembly actual transmission luminous power
Size, and make a response.
It should be noted that optical module provided in this embodiment, the temperature self-adaptation current source can be independent electricity
Line structure can also be integrated in the optical assembly, can also be integrated in the driving chip, the present embodiment does not limit this
It is fixed.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect
It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention
Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of temperature self-adaptation current source, which is characterized in that including proportion current source, thermistor, power end, input terminal with
And output end；
The proportion current source includes reference current branch and output current branch, and the thermistor is connected on the benchmark electricity
In stream branch or it is connected in the output current branch；
One end of the reference current branch connects the input terminal and suitable for receiving the feedback current from optical assembly, described defeated
The one end for going out current branch connects the output end and suitable for exporting sample rate current to the driving chip of the optical assembly, described to adopt
Sample electric current and temperature positive correlation, described in the other end of the reference current branch is connected with the other end of the output current branch
Power end.
2. temperature self-adaptation current source according to claim 1, which is characterized in that the power end is suitable for receiving power supply electricity
Pressure, the output current branch include first resistor and the first PNP triode, the reference current branch include second resistance and
Second PNP triode；
The other end of the other end of the one end of the first resistor as the output current branch, the first resistor connects institute
State the emitter of the first PNP triode, the base stage of first PNP triode connect second PNP triode base stage and
The collector of second PNP triode, the collector of first PNP triode as the output current branch one
End；
The other end of the other end of the one end of the second resistance as the reference current branch, the second resistance connects institute
State the emitter of the second PNP triode, the one end of the collector of second PNP triode as the reference current branch.
3. temperature self-adaptation current source according to claim 2, which is characterized in that the thermistor is negative temperature coefficient
Thermistor and the thermistor be connected in the output current branch；Alternatively, the thermistor is positive temperature system
Several thermistors and the thermistor are connected in the reference current branch.
4. temperature self-adaptation current source according to claim 3, which is characterized in that the thermistor is negative temperature coefficient
Thermistor；
The thermistor is connected between the power end and one end of the first resistor or thermistor series connection
Between the other end and the emitter of first PNP triode of the first resistor.
5. temperature self-adaptation current source according to claim 3, which is characterized in that the thermistor is positive temperature coefficient
Thermistor；
The thermistor is connected between the power end and one end of the second resistance or thermistor series connection
Between the other end and the emitter of second PNP triode of the second resistance.
6. temperature self-adaptation current source according to claim 1, which is characterized in that the power end ground connection, the output
Current branch includes first resistor and the first NPN triode, and the reference current branch includes tri- pole of second resistance and the 2nd NPN
Pipe；
The other end of the other end of the one end of the first resistor as the output current branch, the first resistor connects institute
State the emitter of the first NPN triode, the base stage of first NPN triode connect second NPN triode base stage and
The collector of second NPN triode, the collector of first NPN triode as the output current branch one
End；
The other end of the other end of the one end of the second resistance as the reference current branch, the second resistance connects institute
State the emitter of the second NPN triode, the one end of the collector of second NPN triode as the reference current branch.
7. temperature self-adaptation current source according to claim 6, which is characterized in that the thermistor is negative temperature coefficient
Thermistor and the thermistor be connected in the output current branch；Alternatively, the thermistor is positive temperature system
Several thermistors and the thermistor are connected in the reference current branch.
8. temperature self-adaptation current source according to claim 7, which is characterized in that the thermistor is negative temperature coefficient
Thermistor；
The thermistor is connected between the power end and one end of the first resistor or thermistor series connection
Between the other end and the emitter of first NPN triode of the first resistor.
9. temperature self-adaptation current source according to claim 7, which is characterized in that the thermistor is positive temperature coefficient
Thermistor；
The thermistor is connected between the power end and one end of the second resistance or thermistor series connection
Between the other end and the emitter of second NPN triode of the second resistance.
10. a kind of optical module, which is characterized in that including optical assembly, driving chip and claim 1 to 9 any one of them
Temperature self-adaptation current source；
The optical assembly is used under the driving of bias current and modulation electric current generate transmitting light, and detects the transmitting luminous power
Size exports the feedback current；
The temperature self-adaptation current source, to the feedback current scaling transformation, is exported for receiving the feedback current
The sample rate current；
The driving chip, according to the sample rate current size, exports the bias current for receiving the sample rate current
With the modulation electric current.
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|---|---|---|---|---|
| CN113037255A (en) * | 2021-03-12 | 2021-06-25 | 维沃移动通信有限公司 | Laser sensor control circuit, method and electronic device |
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