CN209170327U - Clock signal processing circuit and electronic equipment - Google Patents
Clock signal processing circuit and electronic equipment Download PDFInfo
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- CN209170327U CN209170327U CN201822245161.3U CN201822245161U CN209170327U CN 209170327 U CN209170327 U CN 209170327U CN 201822245161 U CN201822245161 U CN 201822245161U CN 209170327 U CN209170327 U CN 209170327U
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Abstract
The utility model discloses a kind of clock signal processing circuit and electronic equipment, the utility model includes resonance modules and filter module by the circuit；The resonance modules are connect with the filter module；Wherein, the resonance modules carry out resonance processing to the clock signal of access, by the clock signal transmission by resonance processing to the filter module, the filter module exports after being filtered to received clock signal, can effectively inhibit electromagnetic radiation using simple electronic component, export stable clock signal, it is not only easy to accomplish, and it is at low cost, it avoids and increases biggish cost for countermeasure electromagnetic radiation, save the rectification time.
Description
Technical field
The utility model relates to electronic technology field more particularly to a kind of clock signal processing circuits and electronic equipment.
Background technique
In electronic product, for clock circuit due to frequency height, driving capability is strong, often generates electromagnetic radiation, becomes electricity
The source of sub- product electromagnetic interference has seriously affected product quality and research and development cost.
The method for solving the problems, such as that this is used in electronic product at present has: shielding design, grounding design or signal filtering, so
And these processing solutions are usually unable to effectively inhibit electromagnetic radiation, with the I2S (Inter-IC of general audio product
Sound, integrated circuit built-in audio) for clock signal, it, can be in master clock signal MCLK line generally for electromagnetic radiation is inhibited
Upper increase RC filter circuit, rises MCLK signal slowly, while decaying to high-frequency signal, but the filtered letter of RC of connecting
Number -3dB (0.707 times) frequency decay point is about in 146MHz, Yi Yinqi electromagnetic radiation inadequate to high frequency signal attenuation, because
The electromagnetic radiation inhibitory effect of this prior art is bad.
Utility model content
The main purpose of the utility model is to provide a kind of clock signal processing circuit and electronic equipments, it is intended to solve existing
There is the technical problem for inhibiting electromagnetic radiation bad in clock circuit in technology.
To achieve the above object, the utility model provides a kind of clock signal processing circuit, and the circuit includes resonant mode
Block and filter module；The resonance modules are connect with the filter module；Wherein, clock signal of the resonance modules to access
Resonance processing is carried out, by the clock signal transmission by resonance processing to the filter module, the filter module is to received
Clock signal exports after being filtered.
Preferably, the resonance modules include first resistor, first capacitor and inductance；The first capacitor and the inductance
First end is connect with the first end of the first resistor after parallel connection, second end and institute after the first capacitor and the inductance in parallel
State filter module connection；The second end of the first resistor is connect with clock signal input terminal.
Preferably, the resonance modules further include the second capacitor, second end after the first capacitor and the inductance in parallel
It is connect with the first end of second capacitor, the second end ground connection of second capacitor.
Preferably, the first capacitor is tunable capacitor.
Preferably, the filter module includes second resistance and third capacitor；The first end of the second resistance with it is described
Resonance modules connection, the second end of the second resistance through the third capacity earth, the second end of the second resistance also with
Clock signal output terminal connection.
Preferably, the resistance value of the second resistance is not higher than 33 Ω.
Preferably, the capacity of the third capacitor is not higher than 33pF.
The utility model also proposes a kind of electronic equipment, and the electronic equipment includes clock signal processing electricity as described above
Road.
Preferably, the electronic equipment further includes decoding chip and power amplifier chips, the resonance modules and the decoding core
Piece connection, the filter module are connect with the power amplifier chips.
Preferably, the electronic equipment is television set.
The utility model includes resonance modules and filter module by the clock signal processing circuit；The resonance modules
It is connect with the filter module；Wherein, the resonance modules carry out resonance processing to the clock signal of access, will be by resonance
The clock signal transmission of reason to the filter module, the filter module is filtered received clock signal rear defeated
Out, electromagnetic radiation can effectively be inhibited using simple electronic component, exports stable clock signal, be not only easy real
It is existing and at low cost, it avoids and increases biggish cost for countermeasure electromagnetic radiation, save the rectification time.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of clock signal processing circuit first embodiment of the utility model；
Fig. 2 is the functional block diagram of the utility model a kind of electronic equipment second embodiment；
Fig. 3 is that there was only RC filter module frequency response chart in the prior art；
Fig. 4 is to increase the frequency response chart after RLC resonance modules in second embodiment.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 100 | Resonance modules | C1 | First capacitor |
| 200 | Filter module | C2 | Second capacitor |
| 300 | Decoding chip | C3 | Third capacitor |
| 400 | Power amplifier chips | L | Inductance |
| R1 | First resistor | GND | Ground connection |
| R2 | Second resistance |
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that if related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding,
Afterwards ...), then directionality instruction is only used for explaining opposite between each component under a certain particular pose (as shown in the picture)
Positional relationship, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the
Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning
The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one
A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve
The combination of case is not present, also not within the protection scope of the requires of the utility model.
The utility model provides a kind of clock signal processing circuit, referring to Fig.1, in the first embodiment, the circuit packet
Include resonance modules 100 and filter module 200；The resonance modules 100 are connect with the filter module 200；Wherein, the resonance
The clock signal of 100 pairs of module accesses carries out resonance processing, by the clock signal transmission by resonance processing to the filtering mould
Block 200, the filter module 200 export after being filtered to received clock signal.
It should be noted that usually only using filter module in existing electronic product and inhibiting electromagnetic radiation, but is simple
Filter module inhibits is not the strongest frequency band of electromagnetic radiation in clock signal, therefore inhibitory effect is unsatisfactory, this
Embodiment increases resonance modules, makes to radiate strongest times of frequency point decaying maximum, achievees the effect that maximum suppression.
Further, the resonance modules 100 include first resistor R1, first capacitor C1 and inductance L；The first capacitor
First end is connect with the first end of the first resistor R1 after C1 is in parallel with the inductance L, the first capacitor C1 and the electricity
Second end is connect with the filter module 200 after sense L is in parallel；The second end and clock signal input terminal of the first resistor R1 connects
It connects.
It should be understood that in the alternating current circuit with resistance, inductance and capacity cell, the voltage at circuit both ends with wherein
Current phase is generally different, their phases can be made identical if adjusting the parameter of inductance or capacitor in circuit, entire electricity
Road is rendered as purely, and circuit reaches this state and is referred to as resonance.Under resonance condition, the total impedance of circuit reaches extreme value
Or extreme value is reached approximately, the distinguishing feature of this circuit is exactly that it has frequency-selecting ability, it can decay useless frequency content,
Useful frequency content is remained, it can be by the strongest frequency band of electromagnetic radiation in clock signal by resonance modules 100
Decay, to achieve the purpose that inhibit electromagnetic radiation in clock signal.
In the present embodiment, the first capacitor C1 is tunable capacitor, resonance can be arranged by adjusting first capacitor C1
Point.
Further, the resonance modules 100 further include the second capacitor C2, the first capacitor C1 and the inductance L simultaneously
Second end is connect with the first end of the second capacitor C2 after connection, the second end ground connection of the second capacitor C2.
It should be understood that the second capacitor C2 is filter capacitor, capacitance is preferably 15pF.
Certainly, since there are inductance L in resonance modules 100, in order to inhibit to increase the higher hamonic wave of inductance generation, this implementation
Example also adds filter module 200, makes the more stable no clutter of clock signal of output.
Further, the filter module 200 includes second resistance R2 and third capacitor C3；The of the second resistance R2
One end is connect with the resonance modules 200, and the second end of the second resistance R2 is grounded through the third capacitor C3, and described second
The second end of resistance R2 is also connect with clock signal output terminal.
It should be noted that filter module 200 is used to that the signal rising edge of output to be made to slow down, while being also used for humorous to high order
Wave is inhibited, and therefore, the resistance value of the second resistance R2 cannot be too high, and general value is not higher than 33 Ω, otherwise signal amplitude
It can decay especially severe, the capacity of the capacitor can not be too high, and general value is not higher than 33pF, and otherwise signal rising edge can become
Must be very slow, cause circuit can not work normally.
The present embodiment includes resonance modules and filter module by the circuit；The resonance modules and the filter module
Connection；Wherein, the resonance modules carry out resonance processing to the clock signal of access, will pass by the clock signal of resonance processing
The filter module is transported to, the filter module exports after being filtered to received clock signal, using simple electricity
Sub- component can effectively inhibit electromagnetic radiation, export stable clock signal, not only easy to accomplish but also at low cost,
It avoids and increases biggish cost for countermeasure electromagnetic radiation, save the rectification time.
The utility model also proposes a kind of electronic equipment, and the electronic equipment includes clock signal processing electricity as described above
The circuit structure on road, the clock signal processing circuit of the electronic equipment can refer to above-described embodiment, and details are not described herein；It can be with
Understand, it is described since the electronic equipment of the present embodiment uses the technical solution of above-mentioned clock signal processing circuit
Electronic equipment has above-mentioned all beneficial effects.
It should be understood that the electronic equipment, which can be smart phone, tablet computer, television set etc., has three-dimensional voice output
Audio frequency apparatus, electronic equipment described in the present embodiment is preferably television set.
It further, is the functional block diagram of the utility model a kind of electronic equipment second embodiment referring to Fig. 2, Fig. 2.
In the present embodiment, the electronic equipment further includes decoding chip 300 and power amplifier chips 400, the resonance modules 100
It is connect with the decoding chip 300, the filter module 200 is connect with the power amplifier chips 400.
It should be noted that decoding chip 300, which exports I2S master clock signal MCLK, gives (the MCLK frequency one of power amplifier chips 400
As be 12.288MHz), while audio signal is transmitted to power amplifier chips 400 and is carried out, realize audio playing function.Work as clock frequency
When for 12.288MHz, the frequency of 11-19 times of frequency point of clock signal is 135.168-233.472MHz, the wave of this component frequency
Long/4 within the scope of clock track lengths, are easy to form antenna effect with corresponding machine interior cabling and be radiated by cabling,
To generate interference.Therefore, decay to the frequency of 11-19 times of frequency point of clock signal, can achieve and utmostly inhibit
The purpose of electromagnetic radiation.
As shown in figure 3, when merely adding RC filter module between decoding chip and power amplifier chips, RC filter module-
For 3dB (0.707 times) frequency decay point about in 146MHz, i.e. cut-off frequecy of passband is about 146MHz, and to the 11-19 of clock signal
The decaying of the frequency band of times frequency point is simultaneously few, is about 2 to 6dB by can be calculated pad value, very to the inhibition of electromagnetic radiation
It is limited.
As shown in figure 4, RLC resonance modules and RC filtering are increased in the present embodiment between decoding chip and power amplifier chips
Module, it is very big to the decaying of the frequency band of 11-19 times of frequency point of clock signal, by can be calculated pad value be about 6.5 to
54dB has very good effect to the inhibition of electromagnetic radiation.
In the concrete realization, according to the resonance characteristic of RLC, resonance point can be arranged in 149.6MHz (as selected resistance value
Inductance L, the first capacitor C1 that capacitance is 22pF that first resistor R1, inductance for 24 Ω are 51nH), this Frequency point declines
Depreciation has reached 20*log (0.002/1)=54dB, and the frequency 135.168-of 11-19 times of frequency point of clock signal
The pad value of 233.472MHz is about 16.5-54dB, more much larger than simple RC filter module, is had to the inhibition of electromagnetic radiation
Very big effect.
The present embodiment by resonance modules decay clock signal in default times of frequency point signal, by by resonance processing when
Clock signal is transmitted to the filter module, and the filter module is filtered the clock signal received, filters out clock
Higher hamonic wave in signal exports filtered clock signal to the power amplifier chips, according to clock signal in audio product
Frequency feature setting resonance point carry out resonance processing, farthest inhibit the electromagnetic radiation in clock signal.
The above is only the preferred embodiments of the utility model, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (10)
1. a kind of clock signal processing circuit, which is characterized in that the circuit includes resonance modules and filter module；The resonance
Module is connect with the filter module；Wherein, the resonance modules carry out resonance processing to the clock signal of access, will pass through humorous
Shake processing clock signal transmission to the filter module, after the filter module is filtered received clock signal
Output.
2. clock signal processing circuit as described in claim 1, which is characterized in that the resonance modules include first resistor,
First capacitor and inductance；The first capacitor is connect with first end after the inductance in parallel with the first end of the first resistor,
The first capacitor is connect with second end after the inductance in parallel with the filter module；The second end of the first resistor and when
The connection of clock signal input part.
3. clock signal processing circuit as claimed in claim 2, which is characterized in that the resonance modules further include the second electricity
Hold, the first capacitor is connect with second end after the inductance in parallel with the first end of second capacitor, second capacitor
Second end ground connection.
4. clock signal processing circuit as claimed in claim 3, which is characterized in that the first capacitor is tunable capacitor.
5. clock signal processing circuit according to any one of claims 1 to 4, which is characterized in that the filter module packet
Include second resistance and third capacitor；The first end of the second resistance is connect with the resonance modules, and the of the second resistance
Two ends are also connect with clock signal output terminal through the third capacity earth, the second end of the second resistance.
6. clock signal processing circuit as claimed in claim 5, which is characterized in that the resistance value of the second resistance is not higher than 33
Ω。
7. clock signal processing circuit as claimed in claim 6, which is characterized in that the capacity of the third capacitor is not higher than
33pF。
8. a kind of electronic equipment, which is characterized in that including clock signal processing such as claimed in any one of claims 1 to 7
Circuit.
9. electronic equipment as claimed in claim 8, which is characterized in that the electronic equipment further includes decoding chip and power amplifier core
Piece, the resonance modules are connect with the decoding chip, and the filter module is connect with the power amplifier chips.
10. the electronic equipment as described in any one of claim 8 to 9, which is characterized in that the electronic equipment is television set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822245161.3U CN209170327U (en) | 2018-12-28 | 2018-12-28 | Clock signal processing circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822245161.3U CN209170327U (en) | 2018-12-28 | 2018-12-28 | Clock signal processing circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209170327U true CN209170327U (en) | 2019-07-26 |
Family
ID=67328005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822245161.3U Active CN209170327U (en) | 2018-12-28 | 2018-12-28 | Clock signal processing circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209170327U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112115671A (en) * | 2020-09-14 | 2020-12-22 | 纳瓦电子（上海）有限公司 | Circuit structure for improving electromagnetic radiation of clock signal end of processor and forming method thereof |
-
2018
- 2018-12-28 CN CN201822245161.3U patent/CN209170327U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112115671A (en) * | 2020-09-14 | 2020-12-22 | 纳瓦电子（上海）有限公司 | Circuit structure for improving electromagnetic radiation of clock signal end of processor and forming method thereof |
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