CN103390856B - A kind of method controlling drive circuit for laser power up phase outputting current steadily - Google Patents
A kind of method controlling drive circuit for laser power up phase outputting current steadily Download PDFInfo
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- CN103390856B CN103390856B CN201310300265.9A CN201310300265A CN103390856B CN 103390856 B CN103390856 B CN 103390856B CN 201310300265 A CN201310300265 A CN 201310300265A CN 103390856 B CN103390856 B CN 103390856B
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Abstract
The present invention designs a kind of method controlling drive circuit for laser power up phase outputting current steadily, realized by the module that powers on of drive circuit for laser, the module that powers on comprises overriding clock circuit, electrifying control circuit and upper electric drive circuit, and the present invention utilizes numeral to trim technology to improve different chip clock circuit period consistency; Electrifying control circuit is utilized to control upper electric drive circuit power-on time; In utilization, electric drive circuit drives back-end circuit, sets up feedback control loop and formation control stable state.The present invention effectively improves the consistency of different batches drive circuit for laser power-on time, solve power-on time difference when the parallel connection of many driving chip is applied and cause the problem of output current oscillations, introduce the type of drive that control circuit controls drive circuit simultaneously, after circuit stability, drive circuit is set to low power consumpting state, reduces the power consumption during whole chip steady operation.
Description
Technical field
The present invention relates to a kind of method controlling drive circuit for laser power up phase outputting current steadily, belong to drive circuit for laser technical field.
Background technology
Monolithic Integrated Laser Driving Circuit provides a big current of specifying for the outer laser of sheet.Output current is larger, and the driving force needed in chip enable power up is larger, and start-up course is more difficult.Present stage, single-chip integration laser driver circuit output current magnitude was hundred milliamperes of ranks, high driving force is needed in power up, when driving force is not enough, output current can produce the process of a stepped rising, just reach specified drive current after experiencing the longer time, cause whole electro-optical system normally to work.
In order to provide enough driving forces in power up, the power consumption of drive circuit is general higher.But drive circuit is also a part for signal path, therefore, after the feedback control loop of laser drive circuit formation enters stable state, drive circuit is also working on, thus increases the power consumption during whole chip steady-working state.
In actual applications, in order to reach larger driving force, two chip parallel connections can be used, thus improving the upper limit of output current.During use chip in parallel, require very high to the upper electric synchronism of two chips, if two chip power-on times are asynchronous, serious stability problem will be produced: after a chip has powered on and reaches steady-working state, another chip current is not also stablized, now, stablize the output current of chip also in lasting change afterwards, the electric current of this change will feed back to the input signal first stablizing chip, thus cause the state first stablizing chip to change, thus the output current first stablizing chip is changed, the rest may be inferred, thus output current is vibrated for a long time, stable state cannot be reached, outputting current steadily is made to receive great impact, thus electro-optical system cannot normally be worked.
Summary of the invention
The object of the invention is to the above-mentioned deficiency overcoming prior art, a kind of method controlling drive circuit for laser power up phase outputting current steadily is provided, the problem of the driving force that powers on when this method solving drive circuit for laser High-current output deficiency, does not increase the power consumption under chip steady operation condition simultaneously; Solve the inconsistent current oscillation problem caused of chip power-on time between different batches, improve the reliability and stability during output current powers on.
Above-mentioned purpose of the present invention is mainly achieved by following technical solution:
A kind of method controlling drive circuit for laser power up phase outputting current steadily, realized by the module that powers on of drive circuit for laser, the described module that powers on comprises overriding clock circuit, electrifying control circuit and upper electric drive circuit, wherein overriding clock circuit comprises output comparator, periodic Control comparator, shaping circuit, buffer and clock cycle controller, upper electric drive circuit comprises signal amplifier and the booster amplifier that powers on, and concrete methods of realizing is as follows:
Step (one), the first control signal exported by drive circuit for laser are controlled overriding clock circuit and export cycle adjustable clock signal, and the clock signal adjustable cycle is exported to electrifying control circuit, and concrete grammar is as follows:
(1) clock cycle controller receive drive circuit for laser export the first control signal and periodic Control comparator export high level or low level clock signal, according to the first control signal, described high level signal or low level signal are postponed, described high level signal is converted to low level signal simultaneously or described low level signal is converted to high level signal, and the low level signal after conversion or high level signal are exported to periodic Control comparator and output comparator simultaneously;
(2) low level signal of reception or high level signal are exported to clock cycle controller by periodic Control comparator again, clock cycle controller postpones described low level signal or high level signal according to the first control signal exported from drive circuit for laser, described low level signal is converted to high level signal simultaneously or described high level signal is converted to low level signal, and the signal after conversion is exported to periodic Control comparator and output comparator again simultaneously, the like, thus form cycle that high level signal and low level signal replace adjustable clock signal,
(3) the clock signal adjustable cycle of real-time reception is exported to shaping circuit by output comparator, the duty ratio of shaping circuit to clock signal adjusts, obtain the clock signal that duty ratio is 50%, and the clock signal after adjustment is exported to electrifying control circuit;
Step (two), electrifying control circuit receive the clock signal that in overriding clock circuit, shaping circuit exports, and carry out scaling down processing to clock signal, and using second control signal of the clock signal after scaling down processing as upper electric drive circuit;
Step (three), upper electric drive circuit receive pilot signal and the reference voltage of drive circuit for laser output, and amplify the difference of described pilot signal and reference voltage under the control of the second control signal, concrete grammar is as follows:
(5), power on initial time, the booster amplifier that powers on receives the second control signal that electrifying control circuit exports, receive the reference voltage of the pilot signal that drive circuit for laser exports simultaneously, the booster amplifier that powers on amplifies the difference of pilot signal and reference voltage under the control action of the second control signal, and the signal after amplifying is exported to drive circuit for laser; Signal amplifier receives pilot signal and the reference voltage of drive circuit for laser output, amplifies the difference of pilot signal and reference voltage, and the signal after amplifying is exported to drive circuit for laser;
(6), power on terminate after, power on booster amplifier power cut-off under the control action of the second control signal, signal amplifier still receives pilot signal and the reference voltage of drive circuit for laser output, the difference of pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser.
In the method for above-mentioned control drive circuit for laser power up phase outputting current steadily, electrifying control circuit is made up of the frequency divider that frequency dividing ratio is adjustable.
In the method for above-mentioned control drive circuit for laser power up phase outputting current steadily, within step (), the circular error of the clock signal that the overriding clock circuit output cycle is adjustable is reduced to 0.05us.
In the method for above-mentioned control drive circuit for laser power up phase outputting current steadily, in (3) of step (), the clock signal after adjustment is exported to upper electric control module by buffer by shaping circuit, wherein buffer is by increasing pull-up current or the pull-down current of clock signal, to improve the driving force of clock signal.
The present invention compared with prior art has following beneficial effect:
(1), the present invention has carried out innovative design to the module that powers in drive circuit for laser, adopt the module that powers on be made up of overriding clock circuit, electrifying control circuit and upper electric drive circuit, exported by the electric current of the module controls drive circuit power up phase that powers on, the problem of the driving force that powers on when solving drive circuit for laser High-current output deficiency, does not increase the power consumption under chip steady operation condition simultaneously; Solve the inconsistent current oscillation problem caused of chip power-on time between different batches, improve the reliability and stability during output current powers on;
(2), the overriding clock circuit of the present invention controls the impedance of clock cycle controller by the first control signal of input, change the delay of periodic Control comparator output signal, thus it is adjustable to realize clock signal period, technology is trimmed by adopting numeral, within different batches clock signal chip circular error is reduced to 0.05u, the current oscillation problem produced when solving multi-chip parallel connection application;
(3), the present invention adopts the upper electric drive circuit be made up of signal amplifier and the booster amplifier that powers on, in power up, drive circuit uses many driver modules to drive, solve the problem of driving force deficiency under High-current output condition, simultaneously by the second control signal of being produced by electrifying control circuit after outputting current steadily on electric drive circuit control, the power consumption in reduction under electric drive circuit stable state.
Accompanying drawing explanation
Fig. 1 is that the present invention powers on module work schematic diagram;
Fig. 2 is that the present invention powers on overriding clock circuit structural representation in module;
Fig. 3 is that the present invention powers on electrifying control circuit structural representation in module;
Fig. 4 is that the present invention powers on the driving circuit structure schematic diagram that to power in module.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The method that the present invention controls drive circuit for laser power up phase outputting current steadily is realized by the module that powers on drive circuit for laser, be illustrated in figure 1 the present invention to power on module work schematic diagram, the module that powers on as seen from the figure comprises overriding clock circuit, electrifying control circuit and upper electric drive circuit.
Be illustrated in figure 2 the present invention to power on overriding clock circuit structural representation in module, overriding clock circuit comprises output comparator, periodic Control comparator, shaping circuit, buffer and clock cycle controller as seen from the figure, output comparator normal phase input end is connected with the normal phase input end of periodic Control comparator, and be connected with clock cycle controller output signal, output comparator inverting input is connected with the inverting input of periodic Control comparator, and is connected with external fixed bias voltage; Shaping circuit input outputs signal with output comparator and is connected; Buffer input outputs signal with shaping circuit and is connected, output clock signal; Clock cycle controller input is connected with periodic Control comparator output signal, and clock cycle controller output signal is connected with periodic Control comparator normal phase input end with output comparator, forms ring and to shake loop.
The clock signal that the first control signal generation cycle that overriding clock circuit reception drive circuit for laser exports is adjustable, and the clock signal adjustable cycle is exported to electrifying control circuit, specific works process is as follows:
(1) clock cycle controller receives the first control signal of drive circuit for laser output and the clock signal (high level clock signal or low level clock signal) of periodic Control comparator output, according to the first control signal, clock signal is postponed, clock signal is changed simultaneously, that is: if high level signal is then converted to low level signal, if low level signal is then converted to high level signal, and the clock signal (low level signal or high level signal) after conversion is exported to periodic Control comparator and output comparator simultaneously.
(2) low level signal of reception or high level signal are exported to clock cycle controller by periodic Control comparator again, clock cycle controller postpones low level signal or high level signal according to the first control signal exported from drive circuit for laser, low level signal is converted to high level signal simultaneously or high level signal is converted to low level signal, and the signal after conversion is exported to periodic Control comparator and output comparator again simultaneously, the like, continuous circulation, thus form cycle that high level signal and low level signal replace adjustable clock signal.
(3) the clock signal adjustable cycle of real-time reception is exported to shaping circuit by output comparator simultaneously, the duty ratio of shaping circuit to clock signal adjusts, obtain the clock signal that duty ratio is 50%, and the clock signal after adjustment is exported to buffer;
(4) clock signal after buffer inputs adjustment, by increasing the pull-up current of clock signal or pull-down current, to improve the driving force of clock signal, posterior bumper clock signal is exported to electrifying control circuit.
Within the circular error that the overriding clock circuit of the present invention exports cycle adjustable clock signal is reduced to 0.05us.
Be illustrated in figure 3 the present invention to power on electrifying control circuit structural representation in module, electrifying control circuit is made up of the frequency divider that frequency dividing ratio is adjustable, 2,4,8,16,32,64 frequency dividers adjustable respectively can be formed as shown in Figure 3, in the present embodiment, adopt 64 frequency dividers.Electrifying control circuit receives the clock signal that in overriding clock circuit, buffer exports, and carries out 64 scaling down processing, and using second control signal of the clock signal after scaling down processing as upper electric drive circuit, export to electric drive circuit to clock signal.
Be illustrated in figure 4 the present invention to power on the driving circuit structure schematic diagram that to power in module, go up electric drive circuit as seen from the figure and comprise signal amplifier and the booster amplifier that powers on, signal amplifier normal phase input end is connected with the booster amplifier normal phase input end that powers on, and external reference voltage signal, signal amplifier inverting input is connected with the booster amplifier inverting input that powers on, and external inspecting signal, output signal as drive circuit for laser provides drive singal.Whether the booster amplifier that powers on is worked and to be controlled by the second control signal, and pilot signal and reference signal are exported to signal amplifier respectively and powered on booster amplifier.Pilot signal and reference signal are provided by drive circuit for laser front end.
Upper electric drive circuit receives pilot signal and the reference voltage of drive circuit for laser output, and amplify the difference of pilot signal and reference voltage under the control of the second control signal, specific works process is as follows:
(1), power on initial time, the booster amplifier that powers on receives the second control signal that electrifying control circuit exports, receive the reference voltage of the pilot signal that drive circuit for laser exports simultaneously, the booster amplifier that powers on amplifies the difference of pilot signal and reference voltage under the control action of the second control signal, and the signal after amplifying is exported to drive circuit for laser, signal amplifier receives pilot signal and the reference voltage of drive circuit for laser output, the difference of pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser.
(2), power on terminate after, power on booster amplifier power cut-off under the control action of the second control signal, signal amplifier still receives pilot signal and the reference voltage of drive circuit for laser output, the difference of pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser.
Namely signal amplifier is all working in power up with the whole process after terminating that powers on, and the booster amplifier that powers on only works in power up.
The control signal utilizing electrifying control circuit to generate controls the driving force of upper electric drive circuit, the output signal of drive circuit is set up rapidly, formation control stable state, and reduces the driving force of drive circuit after stable state is set up, and reduces power consumption.
As shown in Figure 1, the first step of the present invention: trim overriding clock circuit, improves the consistency in each chip clock cycle; Second step: arrange according to the external world and frequency division is carried out, electric drive circuit in control to the clock signal after trimming; 3rd step: under the control of electrifying control circuit, by upper electric drive circuit output drive signal, drives back-end circuit, and after having powered on, reduces the power consumption of drive circuit.
The above; be only the embodiment of the best of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
The content be not described in detail in specification of the present invention belongs to the known technology of professional and technical personnel in the field.
Claims (4)
1. one kind controls the method for drive circuit for laser power up phase outputting current steadily, it is characterized in that: realized by the module that powers on of drive circuit for laser, the described module that powers on comprises overriding clock circuit, electrifying control circuit and upper electric drive circuit, wherein overriding clock circuit comprises output comparator, periodic Control comparator, shaping circuit, buffer and clock cycle controller, upper electric drive circuit comprises signal amplifier and the booster amplifier that powers on, and concrete methods of realizing is as follows:
Step (one), the first control signal exported by drive circuit for laser are controlled overriding clock circuit and export cycle adjustable clock signal, and the clock signal adjustable cycle is exported to electrifying control circuit, and concrete grammar is as follows:
(1) clock cycle controller receive drive circuit for laser export the first control signal and periodic Control comparator export high level or low level clock signal, according to the first control signal, described high level signal or low level signal are postponed, described high level signal is converted to low level signal simultaneously or described low level signal is converted to high level signal, and the low level signal after conversion or high level signal are exported to periodic Control comparator and output comparator simultaneously;
(2) low level signal of reception or high level signal are exported to clock cycle controller by periodic Control comparator again, clock cycle controller postpones described low level signal or high level signal according to the first control signal exported from drive circuit for laser, described low level signal is converted to high level signal simultaneously or described high level signal is converted to low level signal, and the signal after conversion is exported to periodic Control comparator and output comparator again simultaneously, the like, thus form cycle that high level signal and low level signal replace adjustable clock signal,
(3) the clock signal adjustable cycle of real-time reception is exported to shaping circuit by output comparator, the duty ratio of shaping circuit to clock signal adjusts, obtain the clock signal that duty ratio is 50%, and the clock signal after adjustment is exported to electrifying control circuit;
Step (two), electrifying control circuit receive the clock signal that in overriding clock circuit, shaping circuit exports, and carry out scaling down processing to clock signal, and using second control signal of the clock signal after scaling down processing as upper electric drive circuit;
Step (three), upper electric drive circuit receive pilot signal and the reference voltage of drive circuit for laser output, and amplify the difference of described pilot signal and reference voltage under the control of the second control signal, concrete grammar is as follows:
(5), power on initial time, the booster amplifier that powers on receives the second control signal that electrifying control circuit exports, receive the reference voltage of the pilot signal that drive circuit for laser exports simultaneously, the booster amplifier that powers on amplifies the difference of pilot signal and reference voltage under the control action of the second control signal, and the signal after amplifying is exported to drive circuit for laser; Signal amplifier receives pilot signal and the reference voltage of drive circuit for laser output, amplifies the difference of pilot signal and reference voltage, and the signal after amplifying is exported to drive circuit for laser;
(6), power on terminate after, power on booster amplifier power cut-off under the control action of the second control signal, signal amplifier still receives pilot signal and the reference voltage of drive circuit for laser output, the difference of pilot signal and reference voltage is amplified, and the signal after amplifying is exported to drive circuit for laser.
2. a kind of method controlling drive circuit for laser power up phase outputting current steadily according to claim 1, is characterized in that: described electrifying control circuit is made up of the frequency divider that frequency dividing ratio is adjustable.
3. a kind of method controlling drive circuit for laser power up phase outputting current steadily according to claim 1, is characterized in that: within described step (), the circular error of the clock signal that the overriding clock circuit output cycle is adjustable is reduced to 0.05us.
4. a kind of method controlling drive circuit for laser power up phase outputting current steadily according to claim 1, it is characterized in that: in (3) of described step (), the clock signal after adjustment is exported to upper electric control module by buffer by shaping circuit, wherein buffer is by increasing pull-up current or the pull-down current of clock signal, to improve the driving force of clock signal.
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| CN102014315A (en) * | 2010-09-15 | 2011-04-13 | 索尔思光电（成都）有限公司 | Rapid wavelength stabilization method for optical dense wave division multiplexing |
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| JPH11353684A (en) * | 1998-06-10 | 1999-12-24 | Nippon Columbia Co Ltd | Semiconductor laser controller |
| JP2000313135A (en) * | 1999-04-30 | 2000-11-14 | Sharp Corp | Image forming apparatus |
| US7680364B2 (en) * | 2001-10-09 | 2010-03-16 | Infinera Corporation | Wavelength locking and power control systems for multi-channel photonic integrated circuits (PICS) |
| US7366080B2 (en) * | 2003-11-14 | 2008-04-29 | Matsushita Electric Industrial Co., Ltd. | Laser control unit, laser control circuit, and laser-power adjustment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102014315A (en) * | 2010-09-15 | 2011-04-13 | 索尔思光电（成都）有限公司 | Rapid wavelength stabilization method for optical dense wave division multiplexing |
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| 一种高可靠性上电复位芯片的设计;王汉祥 等;《现代电子技术》;20090331;第32卷(第2期);第12-15页 * |
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