CN100438599C - Apparatus for reducing electromagnetic wave interference and method thereof - Google Patents
Apparatus for reducing electromagnetic wave interference and method thereof Download PDFInfo
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- CN100438599C CN100438599C CNB031423469A CN03142346A CN100438599C CN 100438599 C CN100438599 C CN 100438599C CN B031423469 A CNB031423469 A CN B031423469A CN 03142346 A CN03142346 A CN 03142346A CN 100438599 C CN100438599 C CN 100438599C
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Abstract
The present invention relates to a device and a method for reducing the interference of electromagnetic waves. The present invention generates spread spectrum pulse according to an original pulse, receives a data bit stream according to the original pulse and outputs a data bit stream according to the spread spectrum pulse. The present invention comprises a spread spectrum buffer, a frequency generator and a spread spectrum controller, wherein the spread spectrum buffer is used for temporally storing the data bit stream. The frequency generator is used for generating the spread spectrum pulse according to a frequency increasing signal and a frequency decreasing signal. The spread spectrum controller is used for deciding the frequency increasing signal and the frequency decreasing signal according to the storage capacity of the spread spectrum buffer.
Description
Technical field
The invention relates to a kind of devices and methods therefor that reduces Electromagnetic Interference, and particularly reduce the devices and methods therefor of Electromagnetic Interference about a kind of mode with spread spectrum pulse.
Background technology
Electromagnetic Interference is often arranged between the electronic product, and (Electromagnetic interference EMI), therefore must limit the electromagnetic intensity (intensity) that it gives off.For example the United States Federal's communication enquiry committee (Federal Communication Commission FCC) works out a cover standard, with the amount of radiation of restriction electronic product.
Fig. 1 is the radiation intensity schematic diagram of a pulse signal.Its radiation intensity of the signal of unifrequency f0 I surpasses the standard of EMI easily, is denoted as Ie.The general method that solves EMI for example is with signal spread-spectrum (spread spectrum), concentrates on certain frequency to avoid radiation intensity, therefore can reduce Electromagnetic Interference.Fig. 2 is the radiation intensity schematic diagram of the pulse signal behind the spread spectrum.Therefore the frequency distribution of the pulse signal behind the spread spectrum can disperse radiation intensity, to meet the EMI standard between frequency f 1 and f2.
Fig. 3 is the liquid crystal display device module schematic diagram.Liquid crystal display device module comprises impulse controller 300, source electrode driver 310 and gate drivers 320.Transmission control unit (TCU) 300 data bitstream and pulse signal are to source electrode driver 310 and gate drivers 320.But it is very long with the lead-in wire of gate drivers 320 to source electrode driver 310 that transmission control unit (TCU) 300 transmits signals, and when the resolution of LCD was high more, the frequency of signal was also high more, so the Electromagnetic Interference that causes is also more serious.
General LCD also can reduce Electromagnetic Interference with the mode that produces spread spectrum pulse.Yet such practice may have the situation of loss of data.Because spread spectrum pulse is different with the frequency of original pulse, and therefore the data of input have the situation of loss of data easily still according to the input of the frequency of original pulse, make image fault.
Summary of the invention
In view of this, purpose of the present invention just provides a kind of spread spectrum pulse generation device and method thereof that reduces Electromagnetic Interference and no data loss.
According to purpose of the present invention, a kind of device that reduces Electromagnetic Interference is proposed.This device is to produce spread spectrum pulse according to original pulse, and according to original pulse reception data bit flow, according to spread spectrum pulse dateout bit stream, wherein the difference of the local maximum of this spread spectrum pulse and this original pulse is called positive spread spectrum amount, and the local minimum of this spread spectrum pulse and the difference of this original pulse are called negative spread spectrum amount.This device comprises: the spread spectrum buffer, in order to the temporal data bit stream; Frequency generator increases signal and frequency according to frequency and downgrades signal and produce spread spectrum pulse; The spread spectrum controller, be used to receive the spread spectrum pulse of feedback, and according to the storage capacity of this spread spectrum buffer with threshold value decision frequency increases signal and frequency downgrades signal, wherein this spread spectrum controller receives this original pulse and produces according to this and write the address, receiving this spread spectrum pulse produces according to this and reads the address, and read the difference that address and this write the address according to this and produce the buffer index value, this buffer index value is the storage capacity of this spread spectrum buffer.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below:
Description of drawings
Fig. 1 is the radiation intensity schematic diagram of a pulse signal;
Fig. 2 is the radiation intensity schematic diagram of the pulse signal behind the spread spectrum;
Fig. 3 is the liquid crystal display device module schematic diagram;
Fig. 4 is the traditional spread spectrum pulse and the frequency and the time relation figure of original pulse;
Fig. 5 A is a kind of block diagram that reduces the device of Electromagnetic Interference according to a preferred embodiment of the present invention;
Fig. 5 B is the block diagram of an example of spread spectrum controller;
Fig. 6 A is according to the frequency of spread spectrum pulse of the present invention and original pulse and time relation figure.
Fig. 6 B is according to the buffer index value of Fig. 6 A and time relation figure.
Fig. 7 is logic controller 5 is adjusted spread spectrum pulse according to the minimum value of buffer index value a method flow diagram.
Fig. 8 is logic controller is adjusted spread spectrum pulse according to the maximum of buffer index value a flow chart.
Fig. 9 A and Fig. 9 B show and are respectively spread spectrum pulse and time relation figure and buffer index value and time relation figure.
The drawing reference numeral explanation
300: transmission control unit (TCU)
310: source electrode driver
320: gate drivers
410: the spread spectrum controller
420: the spread spectrum buffer
430: frequency generator
510,520: counter
530: subtracter
540: logic controller
Execution mode
Fig. 4 is the traditional spread spectrum pulse and the frequency and the time relation figure of original pulse.The frequency of original pulse for example is to be fixed as 40MHz, is stably to sweep (sweep) between frequency 38MHz～42MHz through the frequency of the spread spectrum pulse behind the spread spectrum, and its period T that sweeps for example is 1/30K second.There is upwards adjusting point in each cycle, for example in time T/4 o'clock, the frequency of spread spectrum pulse is increased progressively by successively decreasing downwards to be modified to upwards; And downward adjusting point is arranged, for example when time 3T/4, the frequency of spread spectrum pulse is successively decreased by upwards increasing progressively to be modified to downwards.The frequency of spread spectrum pulse is opened up to such an extent that open more, just the spread spectrum amount of spread spectrum pulse is bigger, and then can get over and improve Electromagnetic Interference effectively, but because the output of data is according to spread spectrum pulse, and the input of data is according to original pulse, the excessive problem that loss of data is arranged easily of both frequency differences.The spread spectrum amount of spread spectrum pulse is less, is difficult for having the problem of loss of data, but it is just good inadequately to improve the effect of Electromagnetic Interference.
The object of the invention is reducing Electromagnetic Interference effectively with spread spectrum pulse, and has avoided the problem of the loss of data behind the use spread spectrum pulse.The present invention mainly utilizes buffer (buffer) with temporal data, and the storage capacity of look aside buffer, adjusts the frequency of the spread spectrum pulse of output according to this.
Fig. 5 A is a kind of block diagram that reduces the device of Electromagnetic Interference according to a preferred embodiment of the present invention.The present invention for example is the transmission control unit (TCU) that is applied to liquid crystal screen display, in order to receive original pulse CLKi and data bit flow Di, exports spread spectrum pulse SSCLK and data bit flow Ds then according to this.The device that reduces Electromagnetic Interference comprises spread spectrum controller 410, spread spectrum buffer 420 and frequency generator 430.Spread spectrum buffer 420 is according to writing address Aw and storage data bit stream Di, according to reading address Ar and dateout bit stream Ds.Spread spectrum controller 410 receive original pulse CLKi according to this determination data bit stream Di write address Aw, receive the spread spectrum pulse SSCLK of feedback, determination data bit stream Ds's reads address Ar according to this.Read the storage capacity that address Ar and the difference that writes address Aw are spread spectrum buffer 420, Idx represents with the buffer index value.Spread spectrum controller 410 is to increase signal UP or frequency according to buffer index value Idx with frequency to downgrade the frequency that signal DN order frequency generator 430 increased or downgraded the spread spectrum pulse SSCLK that is produced.Frequency generator 430 for example be phase-locked loop (Phase Lock Loop, PLL).
Fig. 5 B is an example block diagram of spread spectrum controller 410.Spread spectrum controller 410 comprises arithmetic unit 500 and logic controller 540.Arithmetic unit 500 is in order to reception original pulse CLKi and spread spectrum pulse SSCLK, and output writes address Aw, reads address Ar and buffer index value Idx according to this.Logic controller 540 receives buffer index value Idx, judge the opportunity of make progress adjusting point or downward revision point according to this, and then control frequency increases signal UP or frequency downgrades signal DN.
Fig. 6 A is according to the frequency of spread spectrum pulse of the present invention and original pulse and time relation figure, wherein the difference of the local maximum of spread spectrum pulse SSCLK and original pulse CLKi is called positive spread spectrum amount, the difference of the local minimum of spread spectrum pulse SSCLK and original pulse CLKi is called negative spread spectrum amount, but the positive spread spectrum amount of different time points and negative spread spectrum amount may not be definite values.Data bit flow Di imports according to original pulse CLKi, and data bit flow Ds exports according to spread spectrum pulse SSCLK.Original pulse CLKi is different with the frequency of spread spectrum pulse SSCLK, so data need have spread spectrum buffer 420 as cushioning to avoid loss of data.The spread spectrum buffer 420 of present embodiment for example is the storage capacity with 32 data.The storage capacity of spread spectrum buffer 420 is represented with buffer index value Idx.Fig. 6 B is according to the buffer index value of Fig. 6 A and time relation figure.When the frequency of spread spectrum pulse SSCLK during less than the frequency of original pulse CLKi, the speed of the speed ratio input data bit flow Di of dateout bit stream Ds is also slow, therefore the storage capacity of spread spectrum buffer 420 can increase, and just buffer index value Idx can increase, shown in time 0～T/2.When the frequency of spread spectrum pulse SSCLK during greater than the frequency of original pulse CLKi, the speed of the speed ratio input data bit flow Di of dateout bit stream Ds is also fast, therefore the storage capacity of spread spectrum buffer 420 can reduce, and just buffer index value Idx can reduce, shown in time T/2～T.
Under the normal condition, buffer index value Idx is between 5～25, and do not need spread spectrum pulse SSCLK is revised this moment.Be according to the buffer index value opportunity of the upwards adjusting point of spread spectrum pulse and the origination point of downward revision point in the present embodiment, so also can be according to other reference point, and time etc. for example.If need not revise the upwards adjusting point and the downward revision point of spread spectrum pulse, be as origination point in 15 for example then with the buffer index value.
But if the storage capacity deficiency of spread spectrum buffer 420, for example buffer index value Idx is less than 5, and then may produce does not have the exportable danger of data; If spread spectrum buffer 420 will expire, for example buffer index value Idx is greater than 25, then may produce the danger that the data of input store nowhere.Therefore except buffer is provided, the mechanism of the storage capacity of look aside buffer more need be arranged, and adjust the frequency of spread spectrum pulse according to this, not have the purpose of losing to reach data.
Fig. 7 is logic controller 540 is adjusted spread spectrum pulse according to the minimum value of buffer index value a method flow diagram.This method is to adjust the opportunity of the downward revision point of spread spectrum pulse with the minimum value of foundation buffer index value Idx.Be decided to be 5 at this default minimum threshold with buffer index value Idx.This method is at first checked the minimum value of buffer index value Idx, as step 710.According to the minimum value of buffer index value Idx and minimum threshold relatively the result and execution in step 720,730 or 740 respectively.
In step 720, expression one sweeps the minimum value of the buffer index value Idx in the cycle less than minimum threshold, then reduces the negative spread spectrum amount of spread spectrum pulse, the just next in advance downward revision point that sweeps the cycle.For example during the time point T in Fig. 6 B, the minimum value Sm2 of buffer index value Idx is 4, the downward revision point that then next one is swept the cycle is advanced to shown in the label Cd2, just changing into the buffer index value is the frequency of 16 o'clock correction spread spectrum pulse SSCLK, so that the frequency of spread spectrum pulse SSCLK is avoided loss of data in advance toward descending.
In step 730, the minimum value that expression one sweeps the buffer index value Idx in the cycle equals minimum threshold, then keeps the negative spread spectrum amount of spread spectrum pulse, just keeps the downward revision point that the next one sweeps the cycle.For example the minimum value at buffer index value Idx is 5 o'clock, shown in the label Sm1 of the time point among Fig. 6 B 0, then keeps the downward revision point that the next one sweeps the cycle, shown in the label Cd1 of Fig. 6 A.That is to say that it is in 15 that downward revision point at this moment still occurs in buffer index value Idx.
In step 740, expression one sweeps the minimum value of the buffer index value Idx in the cycle greater than minimum threshold, then increases the negative spread spectrum amount of spread spectrum pulse, just delays the downward revision point that the next one sweeps the cycle.For example allowing the downward revision point betide the buffer index value is 14 o'clock, so that the frequency of spread spectrum pulse SSCLK is delayed toward descending, so with more opening that spread spectrum pulse SSCLK opens up, more can prevent Electromagnetic Interference.
Fig. 8 is logic controller 540 is adjusted spread spectrum pulse according to the maximum of buffer index value a flow chart.This method is to adjust the upwards opportunity of adjusting point of spread spectrum pulse with the maximum of foundation buffer index value Idx.Be decided to be 25 at this default max-thresholds with the buffer index value.At first, check the maximum of buffer index value Idx, as step 810.According to the maximum of buffer index value Idx and max-thresholds relatively the result and execution in step 820,830 or 840 respectively.
In step 820, expression one sweeps the maximum of the buffer index value Idx in the cycle less than max-thresholds, then increase the positive spread spectrum amount of spread spectrum pulse, just delay the downward revision point that the next one sweeps the cycle, so that the frequency of spread spectrum pulse SSCLK is delayed toward descending, so more opening that spread spectrum pulse SSCLK opens up more can be able to be prevented Electromagnetic Interference.
In step 830, the minimum value that expression one sweeps the buffer index value Idx in the cycle equals minimum threshold, then keeps the positive spread spectrum amount of spread spectrum pulse, just keeps the upwards adjusting point that the next one sweeps the cycle.
In step 840, expression one sweeps the maximum of the buffer index value Idx in the cycle greater than max-thresholds, then reduces the positive spread spectrum amount of spread spectrum pulse, the just next in advance downward revision point that sweeps the cycle, less with what original pulse CLKi was opened up, to avoid loss of data.Please be simultaneously with reference to Fig. 9 A and Fig. 9 B, it shows: be respectively spread spectrum pulse and time relation figure and buffer index value and time relation figure.During time point T/2 in Fig. 9 B, the maximum SM1 of buffer index value Idx is 26, the downward revision point that then next one is swept the cycle is advanced to shown in Fig. 9 A label CM1, just changing into the buffer index value is the frequency of 14 o'clock correction spread spectrum pulse SSCLK, so that the frequency of spread spectrum pulse SSCLK is avoided loss of data in advance toward rising.
The devices and methods therefor of the disclosed reduction Electromagnetic Interference of the above embodiment of the present invention reduces Electromagnetic Interference with spread spectrum pulse, and can prevent losing of data.
In sum; though the present invention discloses as above with a preferred embodiment; yet; it is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention, can carry out various variations and modification, so protection scope of the present invention should be with being as the criterion that appended claims was limited.
Claims (11)
1. device that reduces Electromagnetic Interference, produce spread spectrum pulse according to original pulse, and according to original pulse reception data bit flow, export this data bit flow according to this spread spectrum pulse, wherein the difference of the local maximum of this spread spectrum pulse and this original pulse is called positive spread spectrum amount, and the local minimum of this spread spectrum pulse and the difference of this original pulse are called negative spread spectrum amount; This device comprises:
The spread spectrum buffer in order to according to temporary this data bit flow of this original pulse, and is exported this data bit flow according to this spread spectrum pulse;
Frequency generator increases signal and frequency according to frequency and downgrades signal and produce this spread spectrum pulse; And
The spread spectrum controller is used to receive the spread spectrum pulse of feedback, and according to the storage capacity of this spread spectrum buffer with a threshold value determines this frequency to increase signal and this frequency downgrades signal,
Wherein this spread spectrum controller receives this original pulse and produces according to this and write the address, receiving this spread spectrum pulse produces according to this and reads the address, and read the difference that address and this write the address according to this and produce the buffer index value, this buffer index value is the storage capacity of this spread spectrum buffer.
2. the device of reduction Electromagnetic Interference as claimed in claim 1, wherein this spread spectrum buffer writes the address according to this and stores this data bit flow, and reads the address according to this and export this data bit flow.
3. the device of reduction Electromagnetic Interference as claimed in claim 1, wherein this spread spectrum controller if the storage capacity of finding this spread spectrum buffer less than minimum threshold, adjust then that this frequency increases signal and this frequency downgrades signal, so that this frequency generator reduces the negative spread spectrum amount of this spread spectrum pulse.
4. the device of reduction Electromagnetic Interference as claimed in claim 1, wherein this spread spectrum controller equals minimum threshold if find the storage capacity of this spread spectrum buffer, then makes this frequency generator keep the negative spread spectrum amount of this spread spectrum pulse.
5. the device of reduction Electromagnetic Interference as claimed in claim 1, wherein this spread spectrum controller if the storage capacity of finding this spread spectrum buffer greater than minimum threshold, adjust then that this frequency increases signal and this frequency downgrades signal, so that this frequency generator increases the negative spread spectrum amount of this spread spectrum pulse.
6. the device of reduction Electromagnetic Interference as claimed in claim 1, wherein this spread spectrum controller if the storage capacity of finding this spread spectrum buffer less than max-thresholds, adjust then that this frequency increases signal and this frequency downgrades signal, so that this frequency generator increases the positive spread spectrum amount of this spread spectrum pulse.
7. the device of reduction Electromagnetic Interference as claimed in claim 1, wherein this spread spectrum controller equals max-thresholds if find the storage capacity of this spread spectrum buffer, then makes this frequency generator keep the positive spread spectrum amount of this spread spectrum pulse.
8. the device of reduction Electromagnetic Interference as claimed in claim 1, wherein this spread spectrum controller if the storage capacity of finding this spread spectrum buffer greater than max-thresholds, adjust then that this frequency increases signal and this frequency downgrades signal, so that this frequency generator reduces the positive spread spectrum amount of this spread spectrum pulse.
9. the device of reduction Electromagnetic Interference as claimed in claim 1, wherein this spread spectrum controller comprises:
Arithmetic unit receives this original pulse and this spread spectrum pulse, and exports according to this that this writes the address, this reads address and this buffer index value; And
Logic controller receives this buffer index value, and exports according to this that this frequency increases signal and this frequency downgrades signal.
10. the device of reduction Electromagnetic Interference as claimed in claim 9, wherein this arithmetic unit comprises:
First counter receives this original pulse, and exports this according to this and write the address;
Second counter receives this spread spectrum pulse, and exports this according to this and read the address; And
Subtracter reads the address and this difference that writes the address is exported this buffer index value according to this.
11. method of adjusting the frequency of spread spectrum clock, it is characterized in that: a memory space and a threshold value according to a spread spectrum buffer determine increasing of a spread spectrum clock frequency and downgrade signal, so that the step that the storage data of this spread spectrum buffer are not lost, wherein, if the frequency of this spread spectrum clock is less than the frequency of this original clock, the memory space of this spread spectrum buffer is reduced, if the frequency of this spread spectrum clock less than the frequency of this original clock, then makes the memory space of this spread spectrum buffer increase.
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| CNB031423469A CN100438599C (en) | 2003-06-13 | 2003-06-13 | Apparatus for reducing electromagnetic wave interference and method thereof |
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| CNB031423469A CN100438599C (en) | 2003-06-13 | 2003-06-13 | Apparatus for reducing electromagnetic wave interference and method thereof |
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| CN100438599C true CN100438599C (en) | 2008-11-26 |
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| CN101719762B (en) * | 2009-11-18 | 2012-07-04 | 电子科技大学 | Spread-spectrum clock signal generator for digital current modulation |
| CN109039319B (en) * | 2018-08-13 | 2022-05-31 | 中科芯集成电路有限公司 | Anti-interference capacitive touch key controller and implementation method |
| WO2020082323A1 (en) * | 2018-10-26 | 2020-04-30 | 深圳市汇顶科技股份有限公司 | Fingerprint detection coding apparatus, fingerprint detection system and electronic device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5631920A (en) * | 1993-11-29 | 1997-05-20 | Lexmark International, Inc. | Spread spectrum clock generator |
| US5757338A (en) * | 1996-08-21 | 1998-05-26 | Neomagic Corp. | EMI reduction for a flat-panel display controller using horizontal-line based spread spectrum |
| US6501307B1 (en) * | 2001-11-12 | 2002-12-31 | Pericom Semiconductor Corp. | Spread-spectrum clock buffer/driver that modulates clock period by switching loads |
| CN1415137A (en) * | 1999-11-18 | 2003-04-30 | 李京浩 | Zero-delay buffer circuit for spread spectrum clock system and method |
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2003
- 2003-06-13 CN CNB031423469A patent/CN100438599C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5631920A (en) * | 1993-11-29 | 1997-05-20 | Lexmark International, Inc. | Spread spectrum clock generator |
| US5757338A (en) * | 1996-08-21 | 1998-05-26 | Neomagic Corp. | EMI reduction for a flat-panel display controller using horizontal-line based spread spectrum |
| CN1415137A (en) * | 1999-11-18 | 2003-04-30 | 李京浩 | Zero-delay buffer circuit for spread spectrum clock system and method |
| US6501307B1 (en) * | 2001-11-12 | 2002-12-31 | Pericom Semiconductor Corp. | Spread-spectrum clock buffer/driver that modulates clock period by switching loads |
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