CN107529712A - A kind of microphone and Bluetooth circuit plate of built-in crystal oscillator - Google Patents
A kind of microphone and Bluetooth circuit plate of built-in crystal oscillator Download PDFInfo
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- CN107529712A CN107529712A CN201710624023.3A CN201710624023A CN107529712A CN 107529712 A CN107529712 A CN 107529712A CN 201710624023 A CN201710624023 A CN 201710624023A CN 107529712 A CN107529712 A CN 107529712A
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- 230000010355 oscillation Effects 0.000 claims description 15
- 238000004088 simulation Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
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Abstract
The invention discloses a kind of microphone and Bluetooth circuit plate of built-in crystal oscillator, including：Acoustics sensing unit, electric signal is converted to for capturing sound；Signal processing unit, it is connected with the acoustics sensing unit, is exported after the signal transacting for receiving the acoustics sensing unit through one first output pin end；One crystal oscillator unit, for providing the signal of the first setting frequency range；One frequency unit, it is connected with the crystal oscillator unit, to being exported after the signal frequency split of first setting frequency range through one second output pin end.Above-mentioned technical proposal has the following advantages that or beneficial effect：16MHz crystal oscillators are replaced by using the crystal oscillator of bigger frequency, the characteristics of smaller using the crystal oscillator area occupied of bigger frequency, crystal oscillator is integrated into microphone, after the microphone of the built-in crystal oscillator is integrated into Bluetooth circuit plate, the area of Bluetooth circuit plate can be reduced, meet the needs that electronic product is integrated, minimizes.
Description
Technical field
The present invention relates to field of micro electromechanical technology, more particularly to a kind of microphone and Bluetooth circuit plate of built-in crystal oscillator.
Background technology
Bluetooth is as a kind of radiotechnics of holding equipment short haul connection, in our daily life already nowhere
Do not exist, the intelligent hardware devices such as smart mobile phone, Intelligent bracelet, intelligent watch, intelligent desk lamp, intelligent earphone, intelligent electric cooker its
Real transmitted using Bluetooth technology.
In Bluetooth system, mainly include master chip, microphone, crystal oscillator and these parts of antenna, crystal oscillator on circuit board
Reference frequency signal is provided in Bluetooth circuit, is to support wireless blue tooth technology to realize the core parts quickly transmitted.It is wireless blue
Most commonly used in tooth is exactly 16MHZ crystal oscillators, with the portable of high-end intelligent artifact, miniaturization, and ultra-thin small size, increasingly
More users can select the crystal oscillator of more small package size, but crystal oscillator size can not further contract under existing technical conditions
Small, microphone and antenna also can not be all integrated among master chip, and these all have impact on the further miniaturization of Bluetooth circuit plate,
Constrain further portable electronic product, miniaturization, integrated development trend.
The content of the invention
The present invention is directed to the limitation of prior art, there is provided a kind of microphone and Bluetooth circuit plate of built-in crystal oscillator.
Above-mentioned technical proposal specifically includes：
A kind of microphone of built-in crystal oscillator, including：
Acoustics sensing unit, electric signal is converted to for capturing sound；
Signal processing unit, it is connected with the acoustics sensing unit, at the signal for receiving the acoustics sensing unit
Exported after reason through one first output pin end；
One crystal oscillator unit, for providing the signal of the first setting frequency range；
One frequency unit, it is connected with the crystal oscillator unit, to being passed through after the signal frequency split of first setting frequency range
One second output pin end exports.
Preferably, in the microphone of above-mentioned built-in crystal oscillator, the acoustics sensing unit includes a digital microphone or simulation
Microphone.
Preferably, in the microphone of above-mentioned built-in crystal oscillator, the crystal oscillator unit includes a crystal oscillator, one first starting of oscillation
Electric capacity, one second starting of oscillation electric capacity；
The first starting of oscillation capacitance connection is between the first end of the crystal oscillator and earth terminal；
The second starting of oscillation capacitance connection is between the second end of the crystal oscillator and earth terminal.
Preferably, in the microphone of above-mentioned built-in crystal oscillator, first setting frequency range is 16MHz integral multiple, if described
Integral multiple is N, and N span is 2,3,4 ... ....
Preferably, in the microphone of above-mentioned built-in crystal oscillator, the frequency unit uses Fractional-N frequency device, N=2,3,4 ... ....
Preferably, in the microphone of above-mentioned built-in crystal oscillator, connected between the first end of the frequency unit and the crystal oscillator
One phase inverter.
Preferably, in the microphone of above-mentioned built-in crystal oscillator, the acoustics sensing unit includes electret microphone or microcomputer
Electric system microphone.
Preferably, in the microphone of above-mentioned built-in crystal oscillator, the signal processing unit and the crystal oscillator unit, institute
Frequency unit is stated to be integrated on a dedicated IC chip.
A kind of Bluetooth circuit plate, including a microphone；
The microphone uses the microphone of the built-in crystal oscillator described in above-described embodiment.
Preferably, in above-mentioned Bluetooth circuit plate, in addition to a master chip and an antenna；
The master chip, the antenna and the microphone are arranged in the Bluetooth circuit plate.
Above-mentioned technical proposal has the following advantages that or beneficial effect：Replace 16MHz brilliant by using the crystal oscillator of bigger frequency
Shake, the characteristics of crystal oscillator area occupied of the bigger frequency of utilization is smaller, crystal oscillator is integrated into microphone, the microphone of the built-in crystal oscillator
After being integrated into Bluetooth circuit plate, the area of Bluetooth circuit plate can be reduced, meet the needs that electronic product is integrated, minimizes.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, the present invention and its feature, outside
Shape and advantage will become more apparent.It should be noted that associated components are not drawn to scale in accompanying drawing, it is preferred that emphasis is
The purport of the present invention is shown.
Fig. 1 is a kind of circuit theory diagrams of the microphone of built-in crystal oscillator in the preferred embodiment of the present invention.
Embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings, but not as the limit of the present invention
It is fixed.
As shown in figure 1, in the preferred embodiment of the present invention, a kind of microphone of built-in crystal oscillator, including：
Acoustics sensing unit MIC, electric signal is converted to for capturing sound；
Signal processing unit Amp, it is connected with acoustics sensing unit MIC, at the signal for receiving acoustics sensing unit MIC
Exported after reason through one first output pin end OUT1；
One crystal oscillator unit, for providing the signal of the first setting frequency range；
One frequency unit Divider, is connected with crystal oscillator unit, to after the signal frequency split of the first setting frequency range through one
Second output pin end OUT2 is exported.
The main object of the present invention is that the first setting frequency range 16MHz for providing crystal oscillator unit passes through frequency unit
The integral multiple that Divider frequency dividings are 16MHz, wherein, integral multiple N span is 2,3,4 ... ..., then defeated by second
Go out leads ends OUT2 outputs, can so cause crystal oscillator X to be integrated into microphone, then be integrated into Bluetooth circuit plate, reduce circuit
The area of plate, and different configurations can be met.
In the preferred embodiment of the present invention, acoustics sensing unit MIC includes a digital microphone or simulation microphone.
The present invention preferred embodiment in, crystal oscillator unit include a crystal oscillator X, one first starting of oscillation electric capacity C1,
One second starting of oscillation electric capacity C2；
First starting of oscillation electric capacity C1 is connected between crystal oscillator X first end and earth terminal；
Second starting of oscillation electric capacity C2 is connected between crystal oscillator X the second end and earth terminal.
First starting of oscillation electric capacity C1, one second starting of oscillation electric capacity C2 effect are to make crystal X starting of oscillations.
In the preferred embodiment of the present invention, the first setting frequency range is 16MHz integral multiple, if integral multiple N=2, i.e.,
First setting frequency range uses 32MHz.
In the preferred embodiment of the present invention, frequency unit Divider uses Fractional-N frequency device, N=2, and 3,4 ... ....
It is anti-phase that one is connected in the preferred embodiment of the present invention, between frequency unit Divider and crystal oscillator X first end
Device INV.
Phase inverter INV effect is to enable crystal X to continue to produce vibration, and obtains the signal of one second frequency range, the second frequency
The signal of section simultaneously exports through the second output pin end OUT2.In the preferred embodiment of the present invention, acoustics sensing unit MIC bags
Include electret microphone or MEMS condenser microphone.
In the preferred embodiment of the present invention, signal processing unit Amp and crystal oscillator unit, frequency unit
Divider is integrated on a dedicated IC chip, reduces the area of microphone so as to ground, and it is empty to leave more wirings
Between, comply with circuit board high density, miniaturization, integrated development trend.
A kind of Bluetooth circuit plate, including a microphone；
Microphone uses the microphone of the built-in crystal oscillator described in above-described embodiment.
In the preferred embodiment of the present invention, in addition to a master chip and an antenna；
Master chip, antenna and microphone are arranged in Bluetooth circuit plate, can so obtain highly integrated Bluetooth circuit plate, because
This place reduces the area of Bluetooth circuit plate, realizes and minimizes integrated Bluetooth circuit plate.
It should be appreciated by those skilled in the art that those skilled in the art combine prior art and above-described embodiment can be with
Various change example is realized, such change case has no effect on the substantive content of the present invention, will not be described here.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, wherein the equipment and structure be not described in detail to the greatest extent are construed as giving reality with the common mode in this area
Apply；Any those skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and technical content many possible changes and modifications are made to technical solution of the present invention, or be revised as equivalent variations etc.
Embodiment is imitated, this has no effect on the substantive content of the present invention.Therefore, every content without departing from technical solution of the present invention, foundation
The technical spirit of the present invention still falls within the present invention to any simple modifications, equivalents, and modifications made for any of the above embodiments
In the range of technical scheme protection.
Claims (10)
- A kind of 1. microphone of built-in crystal oscillator, it is characterised in that including：Acoustics sensing unit, electric signal is converted to for capturing sound；Signal processing unit, it is connected with the acoustics sensing unit, after the signal transacting for receiving the acoustics sensing unit Exported through one first output pin end；One crystal oscillator unit, for providing the signal of the first setting frequency range；One frequency unit, be connected with the crystal oscillator unit, to after the signal frequency split of first setting frequency range through one Two output pin ends export.
- 2. the microphone of built-in crystal oscillator as claimed in claim 1, it is characterised in that the acoustics sensing unit includes a numeral Microphone or simulation microphone.
- 3. the microphone of built-in crystal oscillator as claimed in claim 1, it is characterised in that it is brilliant that the crystal oscillator unit includes one Shake, one first starting of oscillation electric capacity, one second starting of oscillation electric capacity；The first starting of oscillation capacitance connection is between the first end of the crystal oscillator and earth terminal；The second starting of oscillation capacitance connection is between the second end of the crystal oscillator and earth terminal.
- 4. the microphone of built-in crystal oscillator as claimed in claim 1, it is characterised in that first setting frequency range is 16MHz's Integral multiple, if the integral multiple is N, N span is 2,3,4 ... ....
- 5. the microphone of built-in crystal oscillator as claimed in claim 4, it is characterised in that the frequency unit uses Fractional-N frequency device, N =2,3,4 ... ....
- 6. the microphone of crystal oscillator as claimed in claim 3 built-in, it is characterised in that the of the frequency unit and the crystal oscillator A phase inverter is connected between one end.
- 7. the microphone of built-in crystal oscillator as claimed in claim 1, it is characterised in that the acoustics sensing unit includes electret Microphone or MEMS condenser microphone.
- 8. the microphone of built-in crystal oscillator as claimed in claim 1, it is characterised in that the signal processing unit and the crystal Oscillator unit, the frequency unit are integrated on a dedicated IC chip.
- 9. a kind of Bluetooth circuit plate, it is characterised in that including a microphone；The microphone uses the microphone of the built-in crystal oscillator described in any one in claim 1-8.
- 10. Bluetooth circuit plate as claimed in claim 9, it is characterised in that also including a master chip and an antenna；The master chip, the antenna and the microphone are arranged in the Bluetooth circuit plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624023.3A CN107529712A (en) | 2017-07-27 | 2017-07-27 | A kind of microphone and Bluetooth circuit plate of built-in crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624023.3A CN107529712A (en) | 2017-07-27 | 2017-07-27 | A kind of microphone and Bluetooth circuit plate of built-in crystal oscillator |
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| Publication Number | Publication Date |
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| CN107529712A true CN107529712A (en) | 2018-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710624023.3A Pending CN107529712A (en) | 2017-07-27 | 2017-07-27 | A kind of microphone and Bluetooth circuit plate of built-in crystal oscillator |
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2017
- 2017-07-27 CN CN201710624023.3A patent/CN107529712A/en active Pending
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| US6708026B1 (en) * | 2000-01-11 | 2004-03-16 | Ericsson Inc. | Division based local oscillator for frequency synthesis |
| TW518900B (en) * | 2001-09-11 | 2003-01-21 | Ind Tech Res Inst | Structure of electret silicon capacitive type microphone and method for making the same |
| CN1938927A (en) * | 2003-12-01 | 2007-03-28 | 音频专用集成电路公司 | Microphine with voltage pump |
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| CN103684256A (en) * | 2012-09-12 | 2014-03-26 | 无锡华润矽科微电子有限公司 | High-accuracy digital temperature-compensated crystal oscillator circuit structure with built-in crystal oscillator |
| US20150281841A1 (en) * | 2014-03-31 | 2015-10-01 | Circuit Design, Inc. | Audio fm transmitter |
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