CN217470279U - MEMS system comprising bias circuit of ECM - Google Patents
MEMS system comprising bias circuit of ECM Download PDFInfo
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- CN217470279U CN217470279U CN202221309925.0U CN202221309925U CN217470279U CN 217470279 U CN217470279 U CN 217470279U CN 202221309925 U CN202221309925 U CN 202221309925U CN 217470279 U CN217470279 U CN 217470279U
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Abstract
The utility model discloses a MEMS system of biasing circuit who contains ECM relates to the signal processing field, and this MEMS system of biasing circuit who contains ECM includes: the ECM circuit is used for converting the sound signal into an electric signal and outputting the electric signal; the MCMS circuit is used for converting the sound signal into an electric signal to be output and outputting the sound signal of the ECM circuit; the blocking processing circuit is used for filtering the influence of a bias circuit of the ECM circuit on the MCMS circuit; ECM circuit connection blocking treatment circuit, blocking treatment circuit connects the MCMS circuit, compares with prior art, the beneficial effects of the utility model are that: the utility model provides a need distinguish different model intelligent module with different BOM when using ECM and MEMS, also for the problem of reduction scheme merchant at module outlying design complexity simultaneously.
Description
Technical Field
The utility model relates to a signal processing field specifically is a MEMS system that contains biasing circuit of ECM.
Background
Conventional ECM (electret condenser microphone) design circuit to simplify the circuit design complexity of the MIC (microphone) terminal, a part of the bias circuit is placed at the codec terminal inside the module.
Conventional MEMS (microelectromechanical microphone) design circuits, in contrast to ECM design circuits, lack MIC BIAS circuitry in addition to the need for MIC BIAS power for MEMS.
There are design differences in the biasing circuitry due to the ECM and MEMS circuitry. If the bias circuit is placed in the module, when the scheme provider uses the ECM and the MES, the module end must be divided into two modules of different models by using different BOMs (component lists) to provide the scheme provider, which is not beneficial to the selection of the module by the scheme provider, and if the bias circuit is placed at the backplane end of the scheme provider, the complexity of the peripheral design of the client is increased. For the above reasons, it is desirable to design a circuit that can support both ECM and MEMS.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a MEMS system including a bias circuit of ECM to solve the problems mentioned in the background art.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a MEMS system containing a bias circuit for an ECM, comprising:
the ECM circuit is used for converting the sound signal into an electric signal and outputting the electric signal;
the MCMS circuit is used for converting the sound signal into an electric signal to be output and outputting the sound signal of the ECM circuit;
the blocking processing circuit is used for filtering the influence of a bias circuit of the ECM circuit on the MCMS circuit;
the ECM circuit is connected with the blocking processing circuit, and the blocking processing circuit is connected with the MCMS circuit.
As a further aspect of the present invention: the ECM circuit comprises a resistor R1, a resistor R2, a capacitor C302, a capacitor C305, a capacitor C303, a resistor R300, a resistor R301, a resistor R305 and a resistor R306, wherein one end of the resistor R1 is connected with an MIC1-P port, the other end of the resistor R1 is connected with the capacitor C302, the other end of the capacitor C302 is connected with the resistor R301 and a DC blocking processing circuit, the other end of the resistor R301 is connected with the resistor R300 and the capacitor C303, the other end of the resistor R300 is connected with an audio signal MIC-BIAS, the other end of the capacitor C303 is connected with the resistor R305 and the resistor R306, the other end of the resistor R305 is grounded, the other end of the resistor R306 is connected with the DC blocking processing module, the other end of the capacitor C305 and the other end of the capacitor C305 is connected with a resistor R2, and the other end of the resistor R2 is connected with an MICI-N port.
As a further aspect of the present invention: the MCMS circuit comprises an integrated circuit U1, a first end of the integrated circuit U1 is connected with a sound signal MIC-BIAS and a capacitor C301, the other end of the capacitor C301 is grounded, a second end of the integrated circuit U1 is connected with a third end of the integrated circuit U1, a resistor R308 and a DC blocking processing circuit, the other end of the resistor R308 is grounded, and a fourth end of the integrated circuit U1 is connected with the DC blocking processing circuit.
As a further aspect of the present invention: the DC blocking processing circuit comprises a capacitor C1, a capacitor C2, a capacitor C300, a capacitor C304, a capacitor C306 and a transient suppression diode T300, wherein one end of the capacitor C1 is connected with the ECM circuit, the other end of the capacitor C1 is connected with the capacitor C300, the capacitor C306, the transient suppression diode T300 and the MCMS circuit, the other end of the transient suppression diode T300 is grounded, the other end of the capacitor C306 is grounded, the other end of the capacitor C300 is connected with the capacitor C304 and the capacitor C2, the other end of the capacitor C304 is grounded, and the other end of the capacitor C2 is connected with the ECM circuit.
As a further aspect of the present invention: the capacitance values of the capacitor C1 and the capacitor C2 are 100 nf.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a need distinguish different model intelligent module with different BOM when using ECM and MEMS, also for the problem of reduction scheme merchant at module outlying design complexity simultaneously.
Drawings
FIG. 1 is a circuit diagram of a MEMS system including a bias circuit for the ECM.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1, a MEMS system including a bias circuit for an ECM includes:
the ECM circuit is used for converting the sound signal into an electric signal and outputting the electric signal;
the MCMS circuit is used for converting the sound signal into an electric signal to be output and outputting the sound signal of the ECM circuit;
the blocking processing circuit is used for filtering the influence of a bias circuit of the ECM circuit on the MCMS circuit;
the ECM circuit is connected with the blocking processing circuit, and the blocking processing circuit is connected with the MCMS circuit.
In this embodiment: referring to fig. 1, the ECM circuit includes a resistor R1, a resistor R2, a capacitor C302, a capacitor C305, a capacitor C303, a resistor R300, a resistor R301, a resistor R305, and a resistor R306, wherein one end of the resistor R1 is connected to the MIC1-P port, the other end of the resistor R1 is connected to the capacitor C302, the other end of the capacitor C302 is connected to the resistor R301 and the dc blocking processing circuit, the other end of the resistor R301 is connected to the resistor R300 and the capacitor C303, the other end of the resistor R300 is connected to the audio signal MIC-BIAS, the other end of the capacitor C303 is connected to the resistor R305 and the resistor R306, the other end of the resistor R305 is grounded, the other end of the resistor R306 is connected to the dc blocking processing module, the other end of the capacitor C305 is connected to the resistor R2, and the other end of the resistor R2 is connected to the MICI-N port.
The sound signal MIC-BIAS is output to a MIC1-P port through a resistor R300, a resistor R301, a capacitor C302 and a resistor R1, is output to a MICI-N port through a resistor R300, a capacitor C303, a resistor R306, a capacitor C305 and a resistor R2, and is output to the module through two ports for decoding, wherein the MIC1-P port is connected to a codec end inside the module.
In this embodiment: referring to fig. 1, the MCMS circuit includes an integrated circuit U1, a first terminal of the integrated circuit U1 is connected to the MIC-BIAS and the capacitor C301, another terminal of the capacitor C301 is grounded, a second terminal of the integrated circuit U1 is connected to the third terminal of the integrated circuit U1, the resistor R308 and the dc blocking processing circuit, another terminal of the resistor R308 is grounded, and a fourth terminal of the integrated circuit U1 is connected to the dc blocking processing circuit.
The sound signal MIC-BIAS is directly input to a first terminal of an integrated circuit U1 for processing, wherein the integrated circuit U1 is a type MIC301, and is a microphone chip for processing the sound signal.
In this embodiment: referring to fig. 1, the dc blocking processing circuit includes a capacitor C1, a capacitor C2, a capacitor C300, a capacitor C304, a capacitor C306, and a transient suppression diode T300, one end of the capacitor C1 is connected to the ECM circuit, the other end of the capacitor C1 is connected to the capacitor C300, the capacitor C306, the transient suppression diode T300, and the MCMS circuit, the other end of the transient suppression diode T300 is grounded, the other end of the capacitor C306 is grounded, the other end of the capacitor C300 is connected to the capacitor C304 and the capacitor C2, the other end of the capacitor C304 is grounded, and the other end of the capacitor C2 is connected to the ECM circuit.
Since the ECM circuit needs a bias circuit (resistor R300, resistor R301, capacitor C303, resistor R305, and resistor R306 in fig. 1), so that directly outputting the audio signal (right end of resistor R301 and right end of resistor R306 in fig. 1) to the MCMS circuit will result in outputting a dc signal, which cannot be decoded, so that capacitor C1 and capacitor C2 are added to block the dc current and transmit the audio signal to the MCMS circuit; in addition, the transient suppression diode T300 is used for conducting grounding when the circuit voltage is overlarge, and damage to the MCMS circuit caused by the large voltage is avoided.
In this embodiment: referring to fig. 1, the capacitance values of the capacitor C1 and the capacitor C2 are 100 nf.
The DC blocking capacitor is selected to be 100nf, and in practical tests, the result is that the main low-frequency part is slightly worse than the conventional design, the allowance of the low-frequency part is about 1DB, and the normal condition is adjusted to be 2-3 DB.
The utility model discloses a theory of operation is: the ECM circuit converts the sound signal into an electric signal to be output, the MCMS circuit converts the sound signal into an electric signal to be output, the sound signal of the ECM circuit is output, and the DC blocking processing circuit filters the influence of a bias circuit of the ECM circuit on the MCMS circuit.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A MEMS system including a bias circuit for an ECM, characterized by:
the MEMS system including the bias circuit of the ECM includes:
the ECM circuit is used for converting the sound signal into an electric signal and outputting the electric signal;
the MCMS circuit is used for converting the sound signal into an electric signal to be output and outputting the sound signal of the ECM circuit;
the blocking processing circuit is used for filtering the influence of a bias circuit of the ECM circuit on the MCMS circuit;
the ECM circuit is connected with the blocking processing circuit, and the blocking processing circuit is connected with the MCMS circuit.
2. The MEMS system including a BIAS circuit of ECM according to claim 1, wherein the ECM circuit includes a resistor R1, a resistor R2, a capacitor C302, a capacitor C305, a capacitor C303, a resistor R300, a resistor R301, a resistor R305, a resistor R306, one end of the resistor R1 is connected to the MIC1-P port, the other end of the resistor R1 is connected to the capacitor C302, the other end of the capacitor C302 is connected to the resistor R301 and the dc blocking processing circuit, the other end of the resistor R301 is connected to the resistor R300 and the capacitor C303, the other end of the resistor R300 is connected to the audio signal MIC-BIAS, the other end of the capacitor C303 is connected to the resistor R305 and the resistor R306, the other end of the resistor R305 is grounded, the other end of the resistor R306 is connected to the dc blocking processing module, the capacitor C305, the other end of the capacitor C305 is connected to the resistor R2, and the other end of the resistor R2 is connected to the MIC-N port.
3. The MEMS system including a BIAS circuit for ECM according to claim 1, wherein the MCMS circuit includes an integrated circuit U1, a first terminal of the integrated circuit U1 is connected to the audio signal MIC-BIAS and a capacitor C301, another terminal of the capacitor C301 is connected to ground, a second terminal of the integrated circuit U1 is connected to the third terminal of the integrated circuit U1, a resistor R308 and a dc blocking processing circuit, another terminal of the resistor R308 is connected to ground, and a fourth terminal of the integrated circuit U1 is connected to the dc blocking processing circuit.
4. The MEMS system including a bias circuit for ECM according to claim 1, wherein the dc blocking processing circuit includes a capacitor C1, a capacitor C2, a capacitor C300, a capacitor C304, a capacitor C306, and a transient suppression diode T300, one end of the capacitor C1 is connected to the ECM circuit, the other end of the capacitor C1 is connected to the capacitor C300, the capacitor C306, the transient suppression diode T300, and the MCMS circuit, the other end of the transient suppression diode T300 is grounded, the other end of the capacitor C306 is grounded, the other end of the capacitor C300 is connected to the capacitor C304, the capacitor C2, the other end of the capacitor C304 is grounded, and the other end of the capacitor C2 is connected to the ECM circuit.
5. The MEMS system of claim 4, comprising a bias circuit of the ECM, wherein the capacitance of the capacitors C1 and C2 is 100 nf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221309925.0U CN217470279U (en) | 2022-05-17 | 2022-05-17 | MEMS system comprising bias circuit of ECM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221309925.0U CN217470279U (en) | 2022-05-17 | 2022-05-17 | MEMS system comprising bias circuit of ECM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217470279U true CN217470279U (en) | 2022-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221309925.0U Active CN217470279U (en) | 2022-05-17 | 2022-05-17 | MEMS system comprising bias circuit of ECM |
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| Country | Link |
|---|---|
| CN (1) | CN217470279U (en) |
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2022
- 2022-05-17 CN CN202221309925.0U patent/CN217470279U/en active Active
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