CN212034314U - Antistatic anti-interference filter circuit module of digital microphone - Google Patents
Antistatic anti-interference filter circuit module of digital microphone Download PDFInfo
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- CN212034314U CN212034314U CN202020970785.6U CN202020970785U CN212034314U CN 212034314 U CN212034314 U CN 212034314U CN 202020970785 U CN202020970785 U CN 202020970785U CN 212034314 U CN212034314 U CN 212034314U
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Abstract
The utility model discloses an antistatic anti-interference filter circuit module of digital microphone, it includes the power, connector and PDM digital microphone, the VCC end of connector, the VCC end of PDM digital microphone all is connected with power VCC end, the CLK end of connector CLK end and PDM digital microphone is connected, the DATA end of connector is connected with the DATA end of PDM digital microphone, a serial communication port, be connected with filter resistance one between the CLK end of connector CLK end and PDM digital microphone, be connected with filter resistance two between the DATA end of connector and the DATA end of PDM digital microphone. Can increase antistatic ability when keeping apart the clutter, obviously improve module ESD characteristic, make the signal that PDM digital microphone collected purer, make microphone THD's characteristic more reliable and stable.
Description
Technical Field
The utility model relates to a digital microphone technical field, in particular to antistatic anti-interference filter circuit module of digital microphone.
Background
At present, digital microphones are applied more and more widely, from computers to mobile phones and smart homes. Human static electricity, especially in winter in the cold north, static electricity is everywhere, and WiFi also has the original 2.4G and changes 2.4GHz and 5GHz coexisting, and peripheral interference signal is more and more, and the requirement on the anti-jamming capability of digital MIC is more and more high. The early MEMS MIC is a metal shell, has strong anti-interference capability and does not need a built-in high-frequency filter capacitor and a filter circuit as the traditional microphone. The digital microphone is not interfered and influenced by magnetic field signal sources from computers, networks and radio frequency because of the inherent characteristics, so that a shielding wire is not needed when the digital microphone is accessed, and the limited space of related products can be effectively utilized.
Fig. 1 shows a typical recommended modular scheme of MEMS MIC (digital microphone), where MIC1& MIC4 are the left and right microphones of one group of microphones, MIC3& MIC2 are the left and right microphones of the other group of microphones, respectively, and the capacitance values of C1, C2, C3 and C4 are all 0.1 μ F, and then the microphones are connected to CON1 (connector) and connected to a client, so as to implement simultaneous operation of the two groups of microphones, noise reduction, and the like. At present, the metal-encapsulated MEMS MIC is gradually replaced due to the increasingly high signal-to-noise ratio of the MEMS MIC, so that the existing module is difficult to meet the increasingly stringent requirements for anti-interference and anti-static electricity.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a rational in infrastructure, anti-interference, antistatic digital microphone anti-static anti-interference filter circuit module. The technical scheme is as follows:
the anti-static anti-interference filter circuit module of the digital microphone comprises a power supply, a connector and a PDM digital microphone, wherein a VCC end of the connector and a VCC end of the PDM digital microphone are both connected with the VCC end of the power supply, a CLK end of the connector is connected with a CLK end of the PDM digital microphone, a DATA end of the connector is connected with a DATA end of the PDM digital microphone, a first filter resistor is connected between the CLK end of the connector and the CLK end of the PDM digital microphone, and a second filter resistor is connected between the DATA end of the connector and the DATA end of the PDM digital microphone.
As the utility model discloses a further improvement still includes filter capacitor one and filter capacitor two, the termination of filter capacitor one is in between the CLK end of filter resistor one and PDM digital microphone, other end ground connection, the termination of filter capacitor two is in between the DATA end of filter resistor two and PDM digital microphone, other end ground connection.
As a further improvement of the present invention, the first filter capacitor and the second filter capacitor are both 0-22 PF.
As a further improvement, be connected with filter resistance three or the magnetic bead between the VCC end of connector and power VCC end.
As the utility model discloses a further improvement still includes the filter capacitor group, one termination of filter capacitor group is between the VCC end of power VCC end and PDM digital microphone, other end ground connection.
As a further improvement, the filter capacitor bank includes filter capacitor four and filter capacitor five connected in parallel.
As a further improvement of the utility model, the fourth filter capacitor is 0.1-10 muF, and the fifth filter capacitor is 10-22 PF.
As a further improvement of the utility model, the GND end of the PDM digital microphone is grounded through the filter resistor.
As a further improvement of the utility model, the first filter resistor and the second filter resistor are both 0-50 omega.
As a further improvement of the present invention, the PDM digital microphone includes two sets of microphones, and each set of microphones includes a left microphone and a right microphone.
The utility model has the advantages that:
the utility model discloses antistatic anti-interference filter circuit module of digital microphone is connected with filter resistance through between the CLK end at connector CLK end and PDM digital microphone's CLK end, be connected with filter resistance between the DATA end of connector and PDM digital microphone's DATA end, can increase antistatic effect when keeping apart the clutter, obviously improve module ESD characteristic, the signal that makes PDM digital microphone collect is more pure, make microphone THD's characteristic more reliable and stable.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an anti-electrostatic and anti-interference filter circuit module of a conventional digital microphone;
fig. 2 is a schematic structural diagram of the anti-static anti-interference filter circuit module of the digital microphone according to the preferred embodiment of the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
As shown in fig. 2, in order to provide the digital microphone anti-static and anti-interference filter circuit module in the preferred embodiment of the present invention, the digital microphone anti-static and anti-interference filter circuit module includes a power supply, a connector and a PDM digital microphone. VCC end of the connector (CON1) and VCC end of the PDM digital Microphone (MIC) are both connected with VCC end of the power supply, CLK end of the connector is connected with CLK end of the PDM digital microphone, and DATA end of the connector is connected with DATA end of the PDM digital microphone.
A filter resistor R7 is connected between the CLK end of the connector and the CLK ends of the two PDM digital microphones above; a filter resistor R9 is connected between the CLK end of the connector and the CLK ends of the two PDM digital microphones below the connector; a filter resistor R6 is connected between the DATA end of the connector and the DATA ends of the two PDM digital microphones above; and a filter resistor R8 is connected between the DATA end of the connector and the DATA ends of the two PDM digital microphones below. The filter resistors R6, R7, R8 and R9 can increase the antistatic capacity while isolating noise, and obviously improve the ESD characteristics of the module.
In this embodiment, the module further includes filter capacitors C9, C10, C11 and C12, one end of the filter capacitor C10 is connected between the filter resistor R7 and the CLK terminals of the two PDM digital microphones above, and the other end is grounded; one end of the filter capacitor C9 is connected between the filter resistor R6 and the DATA ends of the two PDM digital microphones above, and the other end is grounded; one end of the filter capacitor C12 is connected between the filter resistor R9 and the CLK ends of the two PDM digital microphones below, and the other end is grounded; one end of the filter capacitor C11 is connected between the filter resistor R8 and the DATA ends of the two PDM digital microphones below, and the other end is grounded. The clutter can be filtered out, the signal stability is enhanced, and the WiFi resisting effect is improved.
Preferably, the first filter capacitor and the second filter capacitor are both 0-22 PF.
In this embodiment, a filter resistor three or a magnetic bead is connected between the VCC terminal of the connector and the VCC terminal of the power supply. The method is used for isolating clutter, and can remarkably improve the influence of the frequency on the MIC before the voltage stabilization of the power supply.
In this embodiment, the module further includes a filter capacitor set, one end of the filter capacitor set is connected between the VCC terminal of the power supply and the VCC terminal of the PDM digital microphone, and the other end of the filter capacitor set is grounded. Preferably, the filter capacitor bank comprises a filter capacitor four and a filter capacitor five which are connected in parallel. As shown in fig. 2, the upper left filter capacitor bank includes filter capacitors C1 and C2, the upper right filter capacitor bank includes filter capacitors C7 and C8, the lower left filter capacitor bank includes filter capacitors C5 and C6, and the lower right filter capacitor bank includes filter capacitors C3 and C4.
Preferably, the filter capacitors C1, C3, C5 and C7 are 0.1 μ F-10 μ F, and the filter capacitors C2, C4, C6 and C8 are 10PF-22 PF. The interference generated by the MIC VCC signal can be filtered to other peripheral signals such as 2.4G/5G Hz WIFI, and the signal to noise ratio is improved.
In the present embodiment, the GND terminal of each PDM digital microphone is grounded through filter resistors R1, R2, R3, and R4, respectively. Preferably, the filter resistors R1, R2, R3 and R4 are all 0-50 Ω, more preferably 33 Ω. The power supply voltage stabilizing circuit can be close to the MIC as much as possible, and the influence of the frequency on the MIC before the voltage stabilization of the power supply itself can be obviously improved.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (10)
1. The anti-static anti-interference filter circuit module for the digital microphone comprises a power supply, a connector and a PDM digital microphone, wherein a VCC end of the connector and a VCC end of the PDM digital microphone are both connected with the VCC end of the power supply, a CLK end of the connector is connected with a CLK end of the PDM digital microphone, and a DATA end of the connector is connected with a DATA end of the PDM digital microphone.
2. The anti-static anti-interference filter circuit module for the digital microphone according to claim 1, further comprising a first filter capacitor and a second filter capacitor, wherein one end of the first filter capacitor is connected between the first filter resistor and the CLK end of the PDM digital microphone, the other end of the first filter capacitor is grounded, one end of the second filter capacitor is connected between the second filter resistor and the DATA end of the PDM digital microphone, and the other end of the second filter capacitor is grounded.
3. The digital microphone anti-static anti-interference filter circuit module as claimed in claim 2, wherein the first filter capacitor and the second filter capacitor are both 0-22 PF.
4. The digital microphone anti-static anti-interference filter circuit module set according to claim 1, wherein a filter resistor III or a magnetic bead is connected between a VCC end of the connector and a VCC end of a power supply.
5. The anti-electrostatic and anti-interference filter circuit module for digital microphone according to claim 1, further comprising a filter capacitor set, wherein one end of the filter capacitor set is connected between a power supply VCC terminal and a VCC terminal of the PDM digital microphone, and the other end is grounded.
6. The digital microphone anti-static anti-interference filter circuit module according to claim 5, wherein the filter capacitor bank comprises a filter capacitor four and a filter capacitor five connected in parallel.
7. The anti-static anti-interference filter circuit module of claim 6, wherein the filter capacitor four is 0.1 μ F-10 μ F, and the filter capacitor five is 10PF-22 PF.
8. The anti-static anti-interference filter circuit module for digital microphone according to claim 1, wherein the GND terminal of the PDM digital microphone is grounded through a filter resistor three.
9. The digital microphone anti-static anti-interference filter circuit module as claimed in claim 1, wherein the first filter resistor and the second filter resistor are both 0-50 Ω.
10. The digital microphone anti-static anti-interference filter circuit module according to claim 1, wherein the PDM digital microphones comprise two sets of microphones, each set of microphones comprising a left microphone and a right microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020970785.6U CN212034314U (en) | 2020-06-01 | 2020-06-01 | Antistatic anti-interference filter circuit module of digital microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020970785.6U CN212034314U (en) | 2020-06-01 | 2020-06-01 | Antistatic anti-interference filter circuit module of digital microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212034314U true CN212034314U (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020970785.6U Active CN212034314U (en) | 2020-06-01 | 2020-06-01 | Antistatic anti-interference filter circuit module of digital microphone |
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| CN (1) | CN212034314U (en) |
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2020
- 2020-06-01 CN CN202020970785.6U patent/CN212034314U/en active Active
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