CN101610024A - The frequency generator of tool frequency jitter and PDM keyer - Google Patents
The frequency generator of tool frequency jitter and PDM keyer Download PDFInfo
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Abstract
The invention relates to a kind of frequency generator and PDM keyer of tool frequency jitter, existing known PDM keyer changes the frequency of PDM keyer and reaches the reduction electromagnetic interference with the input power supply, causes the difficulty on the uncertain and circuit design of the scope of frequency jitter but this mode can be subjected to the influence of input voltage and output loading.The PDM keyer utilization of the frequency generator of tool frequency jitter of the present invention and tool frequency jitter is at the adjust frequency frequency signal of generator of the signal of a fixed potential scope, not only avoided the scope of frequency jitter to be subjected to outside input voltage and output loading influence, no matter and the frequency of operation of PDM keyer height, scope according to frequency jitter of the present invention all can be fixed in the percentage range of being scheduled to, and it is more easy that circuit is set.
Description
Technical field
The present invention relates to a kind of frequency generator (Frequency JitterGenerator) of tool frequency jitter, particularly relate to a kind of PDM keyer of using this frequency generator that frequency of operation is changed in a predetermined percentage.
Background technology
Because the employed power supply of most of electronic equipment is direct current, so must there be power supply unit (or rectifier) that the AC system electricity is converted to various direct voltage to provide electronic equipment required electric power.According to the difference of its circuit structure, power supply unit can be divided into two kinds of linear formula and Switching Power Supply supplies.Though the Switching Power Supply supply comes complicatedly than linear formula power supply unit on circuit structure, pulse bigger, electromagnetic interference is also bigger, but power consumption was little, in light weight when the advantage of Switching Power Supply supply was conversion efficiency height, zero load, but generally speaking, the Switching Power Supply supply still is better than linear formula power supply unit, so the market of present power supply unit is to be main flow with the Switching Power Supply supply.
General Switching Power Supply supply operates in high frequency, to dwindle the size of required electronic building brick.Yet, also brought simultaneously electromagnetic interference (Electromagnetic Interfrence, EMI).Electromagnetic interference on causing power supply noise and influence other electronic equipment, also can be because of transmission from TV signal to external radiation that have influence on contiguous Communication Equipment or radio, etc.
The method that tradition reduces electromagnetic interference increases by an electromagnetic interface filter for the input at power supply.Electromagnetic interface filter generally is made up of inductance, electric capacity and resistance, with the filtering electromagnetic interference.Yet electromagnetic interference is big more, and required electromagnetic interface filter is also just big more, cause the increase of circuit cost, and electromagnetic interface filter can't be handled the radiation of EMI.
See also Fig. 1, be the power supply unit of at present common tool frequency jitter (frequency jitter).Rectifier 10 will produce commutating voltage 15 after electromagnetic interface filter 120 filtered alternating voltage 5 rectifications.The primary side coil 35 of commutating voltage 15 input transformer 40 after input filter capacitor 20 filtering, and by secondary side coil 45 outputs.The output of secondary side coil 45 provides an output voltage 60 in power output end 65 after primary side rectifier 50 and output capacitance 55.PDM keyer 90 receives the feedback signal of the feedback loop of being made up of feedback resistance 80, Zener diode 75 and optical coupler 70 in feedback pin position 85, and adjust the duty ratio of built-in transistor switch in view of the above, reach the function of regulated output voltage 60 with the electric power of the primary side coil 35 of adjusting input.
Yet,, further cause when practical application, to be difficult to select suitable electromagnetic interference resistance 140 owing to ripple component can change along with input voltage and output loading.And the scope of frequency jitter (percentage) also will be different along with the size of input voltage, cause inconvenience and difficulty in actual use, the design.
This shows that above-mentioned existing PDM keyer obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of power supply unit and PDM keyer of novel tool frequency jitter, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing PDM keyer exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of novel PDM keyer, can improve general existing PDM keyer, make it have more practicality.Through constantly research, design, and, create the present invention who has practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
Main purpose of the present invention is, overcome the defective that existing PDM keyer exists, and provide a kind of frequency generator and PDM keyer of novel tool frequency jitter, technical problem to be solved is that it is utilized at the adjust frequency frequency signal of generator of the signal of a fixed potential scope, not only avoided the scope of frequency jitter to be subjected to outside input voltage and output loading influence, no matter and the frequency of operation of PDM keyer height, scope according to frequency jitter of the present invention all can be fixed in the percentage range of being scheduled to, and it is more easy that circuit is set.
The object of the invention to solve the technical problems realizes by the following technical solutions.The frequency generator of the tool frequency jitter that proposes according to the present invention comprises a frequency generator and a frequency jitter controller.This frequency generator has a charging current source, a discharging current source and an electric capacity, this charging current source and this discharging current source electrically connect this electric capacity, so that it is discharged and recharged, this frequency generator receives one first reference level signal and one second reference level signal, and according to this first reference level signal and this second reference level signal to this capacitor charge and discharge, the voltage of this electric capacity is changed, to produce a frequency signal between this first reference level signal and this second reference level signal.This frequency jitter controller couples this frequency generator to be changed in a preset range with the size of current of the one at least of controlling this charging current source and this discharging current source.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The frequency generator of aforesaid tool frequency jitter, wherein said frequency jitter controller comprises a ramp generator, in order to produce a ramp signal to control the size of current in this charging current source and this discharging current source, the frequency of this ramp signal is less than the frequency of this frequency signal.
The frequency generator of aforesaid tool frequency jitter, wherein said frequency jitter controller more comprises a voltage divider, this ramp signal is controlled the size of current in this charging current source and this discharging current source after this voltage divider dividing potential drop.
The frequency generator of aforesaid tool frequency jitter, wherein said charging current source are that a voltage changes current converter, become a charging current with the level conversion according to this ramp signal.
The frequency generator of aforesaid tool frequency jitter, wherein said discharging current source are that a voltage changes current converter, become a discharging current with the level conversion according to this ramp signal.
The object of the invention to solve the technical problems also realizes by the following technical solutions.The PDM keyer of the tool frequency jitter that proposes according to the present invention comprises a feedback processor, a frequency jitter controller, a frequency generator and a pulse-duration modulation signal generator.This feedback processor produces a feedback processing signal according to a detection signal of representing load condition.This frequency jitter controller produces a ramp signal, and wherein the level of this ramp signal changes in a predetermined interval.This frequency generator is in order to produce a frequency signal, and the frequency of this frequency signal changes in a preset frequency interval according to this ramp signal.This pulse-duration modulation signal generator produces a switch controlling signal according to this feedback processing signal and this frequency signal, to control the switching of semiconductor switch at least.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The PDM keyer of aforesaid tool frequency jitter, wherein said frequency jitter controller comprises a ramp generator, in order to produce this ramp signal, the frequency of this ramp signal is less than the frequency of this frequency signal.
The PDM keyer of aforesaid tool frequency jitter, wherein said frequency generator, has a charging current source, a discharging current source and an electric capacity, this charging current source and this discharging current source electrically connect this electric capacity, so that it is discharged and recharged, this frequency generator receives one first reference level signal and one second reference level signal, and according to this first reference level signal and this second reference level signal to this capacitor charge and discharge, the voltage of this electric capacity is changed, to produce this frequency signal between this first reference level signal and this second reference level signal.
The PDM keyer of aforesaid tool frequency jitter, the one at least in wherein said charging current source and this discharging current source changes in a preset range according to this ramp signal.
The PDM keyer of aforesaid tool frequency jitter, wherein said frequency jitter controller more comprises a voltage divider, this ramp signal is controlled the size of current in this charging current source and this discharging current source after this voltage divider dividing potential drop.
The PDM keyer of aforesaid tool frequency jitter, wherein said charging current source are that a voltage changes current converter, become a charging current with the level conversion according to this ramp signal.
The PDM keyer of aforesaid tool frequency jitter, wherein said discharging current source are that a voltage changes current converter, become a discharging current with the level conversion according to this ramp signal.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, the frequency generator of tool frequency jitter of the present invention and PDM keyer have following advantage and beneficial effect at least:
The PDM keyer utilization of the frequency generator of tool frequency jitter of the present invention and tool frequency jitter is at the adjust frequency frequency signal of generator of the signal of a predetermined fixed potential scope, not only avoided the scope of frequency jitter to be subjected to outside input voltage and output loading influence, no matter and the frequency of operation of PDM keyer height, scope according to frequency jitter of the present invention all can be fixed in the percentage range of being scheduled to, and it is more easy that circuit is set.And the scope of its frequency jitter can be adjusted by the ratio of frequency jitter resistance JR and frequency setting resistance R T, not only adjust more accurate, also can corresponding different circuit and adjust, but more expand its range of application.
In sum, the PDM keyer of the frequency generator of tool frequency jitter of the present invention and tool frequency jitter is to utilize at the adjust frequency frequency signal of generator of the signal of a fixed potential scope, not only avoided the scope of frequency jitter to be subjected to outside input voltage and output loading influence, no matter and the frequency of operation of PDM keyer height, scope according to frequency jitter of the present invention all can be fixed in the percentage range of being scheduled to, and it is more easy that circuit is set.The present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on product structure or function, obvious improvement is arranged technically, and produced handy and practical effect, and more existing PDM keyer has the outstanding effect of enhancement, thereby being suitable for practicality more, and having the extensive value of industry, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the power supply unit of at present common tool frequency jitter (frequency jitter).
Fig. 2 is the frequency generator circuit schematic diagram of tool frequency jitter according to a preferred embodiment of the present invention.
Fig. 3 is the circuit diagram of the charging current source among Fig. 2 embodiment.
Fig. 4 is the sequential schematic diagram of ramp signal Ramp level, charging current I size and pulse signal Pulse.
Fig. 5 is the circuit diagram of the PDM keyer of tool frequency jitter according to a preferred embodiment of the present invention.
5: alternating voltage 10: rectifier
15: commutating voltage 20: input filter capacitor
35: primary side coil 40: transformer
45: secondary side coil 50: the primary side rectifier
55: output capacitance 60: output voltage
65: power output end 70: optical coupler
75: Zener diode 80: feedback resistance
85: feedback pin position 90: PDM keyer
120:EMI filter 125: frequency jitter pin position
130: frequency jitter pin position 135: the shake electric current
140: electromagnetic interference resistance 210: the frequency jitter controller
212: ramp generator 214: voltage divider
216: ramp signal 220: frequency generator
222: charging current source 224: the discharging current source
226: 230: the first comparators of electric capacity
238: the three comparators of 232: the second comparators
234: the first NAND gate of 228: the four comparators
240: the first switches of 236: the second NAND gate
242: second switch 244: frequency signal
250: error amplifier 252: transistor switch
260: current mirror 310: feedback processor
320: pulse-duration modulation signal generator 322: the pulse-width modulation comparator
324:SR trigger 330: frequency jitter controller
340: frequency generator 350: semiconductor switch
JR: frequency jitter resistance R T: frequency setting resistance
Ramp: ramp signal Vref1: first reference level signal
Vref2: the second reference level signal Vref3: the 3rd reference level signal
I: electric current I 1: electric current
Pulse: pulse signal R: resistance
FB: detection signal Vref: reference voltage signal
Prot: guard signal Max_Duty: maximum duty cycle signal
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, frequency generator and its embodiment of PDM keyer, structure, feature and the effect thereof of the tool frequency jitter that foundation the present invention is proposed, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can clearly present in the following detailed description that cooperates with reference to graphic preferred embodiment.For convenience of description, in following embodiment, components identical is represented with identical numbering.
See also Fig. 2, be the frequency generator circuit schematic diagram of according to a preferred embodiment of the present invention tool frequency jitter.One frequency generator has comprised a frequency jitter controller 210 and a frequency generator 220, and wherein this frequency jitter controller 210 couples this frequency generator 220.Frequency jitter controller 210 comprises a ramp generator 212, in order to produce a ramp signal 216; Frequency jitter controller 210 more comprises a voltage divider 214, and this voltage divider 214 is made up of frequency jitter resistance JR and frequency setting resistance R T, so that ramp signal 216 is carried out dividing potential drop and exports ramp signal Ramp.Frequency generator 220 has a charging current source 222, a discharging current source 224 and an electric capacity 226, and charging current source 222 and discharging current source 224 electrically connect electric capacity 226 so that it is discharged and recharged.Frequency generator 220 receives one first reference level signal Vref1 and one second reference level signal Vref2, and electric capacity 226 is discharged and recharged according to the first reference level signal Vref1 and the second reference level signal Vref2, the voltage of electric capacity 226 is changed, to produce a frequency signal 244 between this first reference level signal and this second reference level signal.In the present embodiment, the ramp signal Ramp that charging current source 222 receives through dividing potential drop, and change the electric current I size of its generation up and down according to ramp signal Ramp, the electric current I size is changed in a preset range, so, no matter the frequency of frequency generator 220 is high or low, the frequency jitter scope of frequency generator 220 all changes in a percentage of being scheduled to.In the practical application, can be the ramp signal Ramp that charging current source 222 and/or discharging current source 224 receive through dividing potential drop, and change the size of current of its generation according to ramp signal 216 up and down.At this, the frequency of ramp signal Ramp is less than the frequency of operation of frequency generator 220.
Frequency generator 220 has more comprised one first comparator 230, one second comparator 232, one first NAND gate 234, one second NAND gate 236, one the 3rd comparator 238, one first switch 240, a second switch 242 and one the 4th comparator 228.First comparator, the 230 comparison frequency signals 244 and the first reference level signal Vref1 also export compare result signal, and second comparator, the 232 comparison frequency signals 244 and the second reference level signal Vref2 and export compare result signal.The output that first NAND gate 234 receives first comparators 230 and second NAND gate 236 is carrying out NAND operation, and second NAND gate 236 receives the output of second comparators 232 and first NAND gate 234 to carry out NAND operation.The 3rd comparator 238 receives the output of first NAND gate 234 and second NAND gate 236, to control the switching of first switch 240 and second switch 242.When the electrical level rising of frequency signal 244 to greater than the first reference level signal Vref1, first switch 240 by and the second switch conducting makes electric capacity 226 begin discharge.When the level of frequency signal 244 drops to less than the second reference level signal Vref2, first switch, 240 conductings and second switch ends make electric capacity 226 begin charging.So go round and begin again and produce the frequency signal 244 of ramp signal.The 4th comparator 228 is the frequency signal 244 and one the 3rd reference level signal Vref3 of ramp signal relatively, produces pulse signal Pulse with conversion.
Next, see also Fig. 3, be the circuit diagram of the charging current source among Fig. 2 embodiment.Charging current source 222 is that a voltage changes current converter, becomes a charging current I according to the level conversion of ramp signal Ramp, comprises an error amplifier 250, transistor switch 252, resistance R and current mirror 260.Wherein, error amplifier 250 is formed a voltage follower with transistor switch 252, make the transistor switch 252 and the current potential of the tie point of resistance R equal the level of ramp signal Ramp, so, the electric current I 1 of the resistance R of flowing through (I1=V/R, V are the level of ramp signal Ramp) becomes charging current I through current mirror 260 mirrors.In like manner, the circuit structure that discharging current source 224 also can be same and reach the effect that changes discharging current according to the level of ramp signal Ramp.
Consult Fig. 4, be the sequential schematic diagram of ramp signal Ramp level, charging current I size and pulse signal Pulse.When ramp signal Ramp electrical level rising, charging current I becomes greatly thereupon, and the frequency of pulse signal Pulse is improved; Otherwise when ramp signal Ramp level descended, charging current I diminished thereupon, and the frequency of pulse signal Pulse is reduced.
Next consult Fig. 5, be the circuit diagram of the PDM keyer of according to a preferred embodiment of the present invention tool frequency jitter.PDM keyer comprises a feedback processor 310, a frequency jitter controller 330, a frequency generator 340 and a pulse-duration modulation signal generator 320.Feedback processor 310 comprises an error amplification signal generator, produces a feedback processing signal according to a detection signal FB who represents load condition and a reference voltage signal Vref.Frequency jitter controller 330 produces a ramp signal, and the level of ramp signal changes in a predetermined interval.Frequency generator 340 couples frequency jitter controller 330, and in order to produce a frequency signal, wherein the frequency of frequency signal changes in a preset frequency interval according to this ramp signal.Pulse-duration modulation signal generator 320 produces a switch controlling signal according to this feedback processing signal and this frequency signal, with the switching of control semiconductor switch 350.Pulse-duration modulation signal generator 320 comprises a pulse-width modulation comparator 322, a set-reset flip-floop 324 and one and door 326.Pulse-width modulation comparator 322 receives the triangular signal of feedback processing signal and frequency generator 340 generations, and the output comparative result is to the R end of set-reset flip-floop 324.The S termination of set-reset flip-floop 324 is received the pulse signal that frequency generator 340 produces, and in output Q output switch control signal.With door 326 receiving key control signals and a guard signal Prot, a maximum duty cycle signal Max_Duty, with the switching of control semiconductor switch 350.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (12)
1, a kind of frequency generator of tool frequency jitter is characterized in that it comprises:
One frequency generator, has a charging current source, a discharging current source and an electric capacity, this charging current source and this discharging current source electrically connect this electric capacity, so that it is discharged and recharged, this frequency generator receives one first reference level signal and one second reference level signal, and according to this first reference level signal and this second reference level signal to this capacitor charge and discharge, make of the variation of the voltage of this electric capacity, to produce a frequency signal in first reference level signal and this second reference level signal; And
One frequency jitter controller couples this frequency generator, changes in a preset range with the size of current of the one at least of controlling this charging current source and this discharging current source.
2, the frequency generator of tool frequency jitter according to claim 1, it is characterized in that wherein said frequency jitter controller comprises a ramp generator, in order to produce a ramp signal to control the size of current in this charging current source and this discharging current source, the frequency of this ramp signal is less than the frequency of this frequency signal.
3, the frequency generator of tool frequency jitter according to claim 2, it is characterized in that wherein said frequency jitter controller more comprises a voltage divider, this ramp signal is controlled the size of current in this charging current source and this discharging current source after this voltage divider dividing potential drop.
4, the frequency generator of tool frequency jitter according to claim 2 is characterized in that wherein said charging current source is that a voltage changes current converter, becomes a charging current with the level conversion according to this ramp signal.
5,, it is characterized in that wherein said discharging current source is that a voltage changes current converter, becomes a discharging current with the level conversion according to this ramp signal according to the frequency generator of claim 2 or 3 described tool frequency jitters.
6, a kind of PDM keyer of tool frequency jitter is characterized in that it comprises:
One feedback processor produces a feedback processing signal according to a detection signal of representing load condition;
One frequency jitter controller produces a ramp signal, and the level of this ramp signal changes in a predetermined interval;
One frequency generator, in order to produce a frequency signal, the frequency of this frequency signal changes in a preset frequency interval according to this ramp signal; And
One pulse-duration modulation signal generator produces a switch controlling signal according to this feedback processing signal and this frequency signal, to control the switching of semiconductor switch at least.
7, the PDM keyer of tool frequency jitter according to claim 6 is characterized in that wherein said frequency jitter controller comprises a ramp generator, and in order to produce this ramp signal, the frequency of this ramp signal is less than the frequency of this frequency signal.
8, the PDM keyer of tool frequency jitter according to claim 7, it is characterized in that wherein said frequency generator, has a charging current source, one discharging current source and an electric capacity, this charging current source and this discharging current source electrically connect this electric capacity, so that it is discharged and recharged, this frequency generator receives one first reference level signal and one second reference level signal, and according to this first reference level signal and this second reference level signal to this capacitor charge and discharge, the voltage of this electric capacity is changed, to produce this frequency signal between this first reference level signal and this second reference level signal.
9, the PDM keyer of tool frequency jitter according to claim 8 is characterized in that the one at least in wherein said charging current source and this discharging current source changes in a preset range according to this ramp signal.
10, the PDM keyer of tool frequency jitter according to claim 9, it is characterized in that wherein said frequency jitter controller more comprises a voltage divider, this ramp signal is controlled the size of current in this charging current source and this discharging current source after this voltage divider dividing potential drop.
11, according to Claim 8 or the PDM keyer of 10 described tool frequency jitters, it is characterized in that wherein said charging current source is that a voltage changes current converter, becomes a charging current with the level conversion according to this ramp signal.
12, according to Claim 8 or the PDM keyer of 10 described tool frequency jitters, it is characterized in that wherein said discharging current source is that a voltage changes current converter, becomes a discharging current with the level conversion according to this ramp signal.
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| CN2008101742639A CN101610024B (en) | 2008-06-20 | 2008-11-14 | Frequency generator with frequency jitter and PWM controller with frequency jitter |
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| CN200810126985 | 2008-06-20 | ||
| CN200810126985.7 | 2008-06-20 | ||
| CN2008101742639A CN101610024B (en) | 2008-06-20 | 2008-11-14 | Frequency generator with frequency jitter and PWM controller with frequency jitter |
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| CN101610024B CN101610024B (en) | 2012-05-23 |
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| CN104122441B (en) * | 2014-07-23 | 2016-08-24 | 上海华虹宏力半导体制造有限公司 | Frequency detecting device |
| CN104122441A (en) * | 2014-07-23 | 2014-10-29 | 上海华虹宏力半导体制造有限公司 | Frequency detection device |
| CN105226953A (en) * | 2015-09-23 | 2016-01-06 | 成都芯源系统有限公司 | Jitter frequency control circuit and control method thereof |
| CN105226953B (en) * | 2015-09-23 | 2018-02-02 | 成都芯源系统有限公司 | Jitter frequency control circuit and control method thereof |
| CN107834822A (en) * | 2016-09-16 | 2018-03-23 | 电力集成公司 | Chattering frequency is modulated when switching frequency is close to chattering frequency |
| US11079778B2 (en) | 2016-09-16 | 2021-08-03 | Power Integrations, Inc. | Modulating jitter frequency as switching frequency approaches jitter frequency |
| CN107834822B (en) * | 2016-09-16 | 2021-11-16 | 电力集成公司 | Controller for switch mode power converter and power converter |
| US11487311B2 (en) | 2016-09-16 | 2022-11-01 | Power Integrations, Inc. | Modulating jitter frequency as switching frequency approaches jitter frequency |
| CN106712471A (en) * | 2017-02-28 | 2017-05-24 | 重庆西山科技股份有限公司 | PWM (Pulse-Width Modulation) power control device |
| CN106712471B (en) * | 2017-02-28 | 2023-05-23 | 重庆西山科技股份有限公司 | PWM power control device |
| CN117318473A (en) * | 2023-11-28 | 2023-12-29 | 苏州锴威特半导体股份有限公司 | Adjustable frequency-jittering oscillator |
| CN117318473B (en) * | 2023-11-28 | 2024-01-30 | 苏州锴威特半导体股份有限公司 | Adjustable frequency-jittering oscillator |
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| CN101610024B (en) | 2012-05-23 |
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