CN110324770B - Microphone, integrated circuit thereof and electronic equipment - Google Patents
Microphone, integrated circuit thereof and electronic equipment Download PDFInfo
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- CN110324770B CN110324770B CN201910707117.6A CN201910707117A CN110324770B CN 110324770 B CN110324770 B CN 110324770B CN 201910707117 A CN201910707117 A CN 201910707117A CN 110324770 B CN110324770 B CN 110324770B
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 230000000903 blocking effect Effects 0.000 claims description 13
- 230000005236 sound signal Effects 0.000 claims description 7
- 230000005669 field effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
- H04R19/013—Electrostatic transducers characterised by the use of electrets for loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/003—Mems transducers or their use
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
The embodiment of the invention discloses a microphone, an integrated circuit thereof and electronic equipment. Wherein the integrated circuit for a microphone comprises: the device comprises a signal multiplexing end, a power output end, a grounding end and a signal input end; the integrated circuit includes: the voltage stabilizing circuit comprises a first input end and a first output end, wherein the first input end is electrically connected with the signal multiplexing end, and the first output end is electrically connected with the power supply output end; the signal conversion circuit comprises a second input end and a controlled current path, wherein the second input end is electrically connected with the signal input end, and the current on the controlled current path is controlled by a voltage signal input by the second input end; an impedance module electrically connected in series with the controlled current path; the impedance module is electrically connected with the first end and the second end after being electrically connected with the controlled current path in series and is respectively electrically connected with the signal multiplexing end and the grounding end. The technical scheme provided by the embodiment of the invention can realize the application of the double-wire port of the microphone.
Description
Technical Field
The present invention relates to the field of microphone technologies, and in particular, to a microphone, an integrated circuit thereof, and an electronic device.
Background
With the development of wireless communications, there are more and more global mobile telephone users. People have increasingly high demands on call quality. The current use of microelectromechanical system microphones (micro electro mechanical systemmicrophone, MEMS) is much more. MEMS microphones use the principle of capacitance. When the external audio sound pressure signal is sensed, the capacitance changes along with the external audio sound pressure signal, and the capacitance changes are converted into voltage signal changes through a subsequent integrated circuit and output.
The existing MEMS microphone is a three-wire port output, the three ports comprising: the power supply end, the output end and the grounding end are not suitable for the electronic equipment with the double-wire port, and the applicability is low.
Disclosure of Invention
The embodiment of the invention provides a microphone, an integrated circuit thereof and electronic equipment, so as to realize the application of a double-wire port of the microphone.
In a first aspect, an embodiment of the present invention provides an integrated circuit for a microphone, including: the device comprises a signal multiplexing end, a power output end, a grounding end and a signal input end;
The integrated circuit further includes:
The voltage stabilizing circuit comprises a first input end and a first output end, wherein the first input end is electrically connected with the signal multiplexing end, and the first output end is electrically connected with the power supply output end;
The signal conversion circuit comprises a second input end and a controlled current path, wherein the second input end is electrically connected with the signal input end, and the current on the controlled current path is controlled by a voltage signal input by the second input end;
An impedance module electrically connected in series with the controlled current path;
The impedance module is electrically connected with the first end and the second end after being electrically connected with the controlled current path in series and is respectively electrically connected with the signal multiplexing end and the grounding end.
Further, the signal conversion circuit comprises a transistor, the impedance module comprises a first resistor, a control electrode of the transistor is electrically connected with a second input end of the signal conversion circuit, and the controlled current path is a path where the first electrode and the second electrode of the transistor are located;
The first pole of the transistor is electrically connected with the signal multiplexing end, and the second pole of the transistor is electrically connected with the grounding end through the first resistor.
Further, the transistor is a field effect transistor.
Further, the integrated circuit for a microphone further comprises a first voltage amplifier, an input end of the first voltage amplifier is electrically connected with the signal input end, and an output end of the first voltage amplifier is electrically connected with a second input end of the signal conversion circuit.
Further, the integrated circuit for the microphone further comprises a boost circuit, wherein an input end of the boost circuit is electrically connected with the first output end of the voltage stabilizing circuit, and an output end of the boost circuit is electrically connected with the power supply output end.
Further, the integrated circuit for the microphone further comprises a second resistor, a first end of the second resistor is electrically connected with the signal multiplexing end, and a second end of the second resistor is electrically connected with the first input end of the voltage stabilizing circuit.
In a second aspect, an embodiment of the present invention further provides a microphone, including: microphone chips and integrated circuits for microphones provided by any of the embodiments of the present invention,
The first end of the microphone chip is electrically connected with the power output end of the integrated circuit, and the second end of the microphone chip is electrically connected with the signal input end of the integrated circuit.
Further, the microphone chip is a micro-electromechanical system microphone chip.
Further, the microphone further includes: a first electrode, a second electrode, a printed circuit board and a housing,
The signal multiplexing end of the integrated circuit is electrically connected with the first electrode, the grounding end of the integrated circuit is electrically connected with the second electrode, and the microphone chip, the first electrode, the second electrode and the integrated circuit are arranged on the printed circuit board;
The shell and the printed circuit board enclose an accommodating space, the microphone chip and the integrated circuit are positioned in the accommodating space, and the first electrode and the second electrode are positioned outside the accommodating space;
The shell is provided with an acoustic inlet.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a first power supply, a third resistor, a dc blocking circuit, a second voltage amplifier, a processor, and a microphone provided in any embodiment of the present invention;
The output end of the first power supply is electrically connected with the signal multiplexing end through a third resistor, the input end of the blocking circuit is electrically connected with the signal multiplexing end, the grounding end is grounded, the output end of the blocking circuit is electrically connected with the input end of the second voltage amplifier, the output end of the second voltage amplifier is electrically connected with the processor, and the processor is used for processing sound signals collected by the microphone.
In the technical solution of the embodiment of the present invention, an integrated circuit for a microphone includes: the integrated circuit for a microphone further comprises: the power supply comprises a voltage stabilizing circuit, a signal converting circuit and an impedance module, wherein the voltage stabilizing circuit comprises a first input end and a first output end, the first input end is electrically connected with a signal multiplexing end, and the first output end is electrically connected with a power supply output end; the signal conversion circuit comprises a second input end and a controlled current path, wherein the second input end is electrically connected with the signal input end, and the current on the controlled current path is controlled by a voltage signal input by the second input end; the impedance module is electrically connected in series with the controlled current path; the first end and the second end after the impedance module is electrically connected with the controlled current path in series are respectively electrically connected with the signal multiplexing end and the grounding end, so that the signal multiplexing end is used as a power supply access end and also used as a signal output end, the microphone is connected with an external circuit only through two ports, namely ports corresponding to the signal multiplexing end and the grounding end, and the problems that the existing microphone is connected with the external circuit through three ports, namely a power supply end, an output end and the grounding end, is not suitable for electronic equipment with double-wire ports and is low in applicability are solved.
Drawings
Fig. 1 is a schematic structural diagram of an integrated circuit for a microphone according to an embodiment of the present invention;
Fig. 2 is a schematic circuit diagram of an application scenario of an integrated circuit for a microphone according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an integrated circuit for a microphone according to an embodiment of the present invention;
Fig. 4 is a schematic circuit diagram of an application scenario of an integrated circuit for a microphone according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional structure of a microphone according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The embodiment of the invention provides an integrated circuit for a microphone. Fig. 1 is a schematic structural diagram of an integrated circuit for a microphone according to an embodiment of the present invention. Fig. 2 is a schematic circuit diagram of an application scenario of an integrated circuit for a microphone according to an embodiment of the present invention. The Application SPECIFIC INTEGRATED Circuit (ASIC) for a microphone may be integrated into the microphone. The integrated circuit 100 for a microphone includes: a signal multiplexing terminal S1, a power output terminal V1, a ground terminal GND and a signal input terminal S2.
The integrated circuit 100 for a microphone further comprises: the voltage stabilizing circuit 110, the signal converting circuit 120 and the impedance module 130.
The voltage stabilizing circuit 110 includes a first input terminal In1 and a first output terminal Out1, the first input terminal In1 is electrically connected with the signal multiplexing terminal S1, and the first output terminal Out1 is electrically connected with the power output terminal V1; the signal conversion circuit 120 includes a second input terminal In2 and a controlled current path 121, the second input terminal In2 is electrically connected with the signal input terminal S2, and the current on the controlled current path 121 is controlled by the voltage signal input by the second input terminal In 2; the impedance module 130 is electrically connected in series with the controlled current path 121; the impedance module 130 is electrically connected to the signal multiplexing terminal S1 and the ground terminal GND at a first terminal and a second terminal electrically connected in series with the controlled current path 121.
The signal multiplexing terminal S1 is used as both a power supply access terminal and a signal output terminal, and the voltage on the signal multiplexing terminal S1 corresponds to a superimposed signal of the power supply voltage of the integrated circuit and the voltage signal converted by the microphone 10. The voltage signal converted by the microphone 10 is changed according to the size and the tone of the sound, so that the voltage of the signal multiplexing terminal S1 fluctuates, and the voltage of the signal multiplexing terminal S1 needs to be converted into a stable dc voltage by the voltage stabilizing function of the voltage stabilizing circuit 110, so as to be output to the microphone chip 200, and provide a bias voltage for the first terminal N1 of the microphone chip 200. The microphone chip 200 converts sound into a voltage signal and outputs the voltage signal to the signal input terminal S2 through the second terminal N2. The current on the current path 121 of the signal conversion circuit 120 varies with the voltage signal input by the second input terminal In2, and optionally, the current on the current path 121 is In a linear relationship with the voltage signal input by the second input terminal In 2. The product of the resistance r of the impedance module 120 and the current i on the controlled current path 121 is equal to the voltage of the signal multiplexing terminal S1, so that the voltage on the signal multiplexing terminal S1 fluctuates along with the sound collected by the microphone 10. The first power supply 20 provides a supply voltage to the signal multiplexing terminal S1 through the third resistor R3. The voltage signal at the signal multiplexing terminal S1 is subjected to a blocking action by the blocking circuit 30 to extract an ac voltage signal related to sound. Optionally, the impedance module 130 includes a resistor. The voltage index of the signal multiplexing terminal S1 is satisfied by reasonably setting the resistance value of the impedance module 130. The microphone chip 200 and the integrated circuit 100 are integrally packaged together, so that the microphone 10 is only connected with an external circuit through two ports, namely, the ports corresponding to the signal multiplexing end S1 and the grounding end GND, and the problems that the existing microphone is connected with the external circuit through three ports, namely, a power end, an output end and a grounding end, is not suitable for electronic equipment with double-line ports and has low applicability are solved.
In the technical solution of the present embodiment, the integrated circuit 100 for a microphone includes: the integrated circuit 100 for a microphone further includes: the voltage stabilizing circuit 110, the signal converting circuit 120 and the impedance module 130, wherein the voltage stabilizing circuit 110 comprises a first input end In1 and a first output end Out1, the first input end In1 is electrically connected with the signal multiplexing end S1, and the first output end Out1 is electrically connected with the power supply output end V1; the signal conversion circuit 120 includes a second input terminal In2 and a controlled current path 121, the second input terminal In2 is electrically connected with the signal input terminal S2, and the current on the controlled current path 121 is controlled by the voltage signal input by the second input terminal In 2; the impedance module 130 is electrically connected in series with the controlled current path 121; the impedance module 120 is electrically connected in series with the controlled current path 121 at a first end and a second end, and is electrically connected with the signal multiplexing end S1 and the ground end GND respectively, so that the signal multiplexing end S1 is used as a power supply access end and also as a signal output end, and the microphone 10 is connected with an external circuit only through two ports, namely ports corresponding to the signal multiplexing end S1 and the ground end GND, so that the problems that the existing microphone is connected with the external circuit through three ports, namely a power supply end, an output end and the ground end, is not suitable for electronic equipment with double-line ports, and has low applicability are solved.
An embodiment of the invention provides yet another integrated circuit for a microphone. Fig. 3 is a schematic structural diagram of yet another integrated circuit for a microphone according to an embodiment of the present invention. Fig. 4 is a schematic circuit diagram of another application scenario of an integrated circuit for a microphone according to an embodiment of the present invention. Based on the above embodiment, the impedance module 130 includes a first resistor R1, the signal conversion circuit 120 includes a transistor T1, a control electrode Ctr1 of the transistor T1 is electrically connected to a second input terminal In2 of the signal conversion circuit 120, and the controlled current path is a path where the first pole and the second pole of the transistor T1 are located; the first pole of the transistor T1 is electrically connected to the signal multiplexing terminal S1, and the second pole of the transistor T1 is electrically connected to the ground terminal GND via the first resistor R1.
The transistor T1 may be a bipolar junction transistor (Bipolar Junction Transistor, BJT) or a field effect transistor. Alternatively, the transistor T1 is a field effect transistor, and compared with a bipolar junction transistor, the current required to flow through the source and the drain of the field effect transistor is smaller, so that the loss can be reduced, and the electric energy can be saved. For example, the transistor T1 is an NMOS transistor, the control electrode Ctr1 of the transistor T1 is a gate, the first electrode of the transistor T1 is a drain, the second electrode of the transistor T1 is a source, and the larger the gate voltage of the transistor T1, the larger the current flowing through the source and the drain of the transistor T1, and the larger the voltage of the signal multiplexing terminal S1. The second pole of the transistor T1 is electrically connected to the ground GND through the first resistor R1, so that compared with the mode of electrically connecting the first pole of the transistor to the signal multiplexing terminal S1 through the impedance module, the stability of the static operating point can be improved, and the influence of the ambient temperature on the performance of the transistor can be reduced.
An embodiment of the invention provides yet another integrated circuit for a microphone. With continued reference to fig. 3, the integrated circuit 100 for a microphone further includes a first voltage amplifier 140, an input terminal of the first voltage amplifier 140 is electrically connected to the signal input terminal S2, and an output terminal of the first voltage amplifier 140 is electrically connected to the second input terminal In2 of the signal conversion circuit 120.
The first voltage amplifier 140 may include an operational amplifier, etc., and the first voltage amplifier 140 may be configured to amplify a voltage at an input terminal thereof by a first preset multiple and output the amplified voltage to an output terminal thereof. The first voltage amplifier 140 has extremely high input impedance (greater than 10G ohms) to reduce background noise, and also has a gain modulation function to compensate for the gain of each microphone to achieve the desired sensitivity.
Optionally, with continued reference to fig. 3, the integrated circuit 100 for a microphone further includes a boost circuit 150, where an input terminal of the boost circuit 150 is electrically connected to the first output terminal Out1 of the voltage stabilizing circuit 110, and an output terminal of the boost circuit 150 is electrically connected to the power supply output terminal V1. The boost circuit 150 may be a charge pump, and may include a plurality of first switches and a plurality of first capacitors, where the boost circuit 150 is configured to boost a dc voltage at an input terminal thereof and output the dc voltage. The booster circuit 150 boosts the input dc voltage to a higher voltage, supplies the voltage to the microphone chip as a bias voltage, and the capacitance type microphone chip converts sound into voltage while the high bias voltage improves the sensitivity of the microphone. The regulator circuit 110 may be a low dropout linear regulator (low dropout regulator, LDO).
Alternatively, the voltage stabilizing circuit 110 may be a boost type switching converter, for example, a boost type switching converter, and has functions of boosting and stabilizing an output voltage.
Optionally, with continued reference to fig. 3, the integrated circuit for a microphone further includes a second resistor R2, where a first end of the second resistor R2 is electrically connected to the signal multiplexing terminal S1, and a second end of the second resistor R2 is electrically connected to the first input terminal In1 of the voltage stabilizing circuit 110.
The voltage and current fluctuation range of the input voltage and current of the first input terminal In1 of the voltage stabilizing circuit 110 are reduced by the current limiting and voltage dividing action of the second resistor R2, so that the reliability of the operation of the voltage stabilizing circuit is provided.
The embodiment of the invention provides a microphone. Referring to fig. 2 or 4, the microphone 10 includes: microphone chip 200 and integrated circuit 100 for a microphone provided by any of the embodiments of the present invention.
The first terminal N1 of the microphone chip 200 is electrically connected to the power output terminal V1 of the integrated circuit 100, and the second terminal N2 of the microphone chip 200 is electrically connected to the signal input terminal S2 of the integrated circuit 100.
The microphone provided by the embodiment of the present invention includes the integrated circuit for a microphone in the above embodiment, so the microphone provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and will not be described herein again.
Optionally, the microphone chip 200 is a silicon microphone chip, and by setting the integrated circuit as a two-wire port, the electronic device adopting the electret microphone (Electret Condenser Micphone, ECM) can directly replace the silicon microphone without changing the design of the main board circuit, so that the replacement cost is reduced. The silicon microphone chip can overcome the problems of poor anti-interference capability, poor consistency and larger output impedance of the electret microphone chip (ECM), and the problem that the common electret microphone chip (ECM) cannot bear the reflow soldering process at high temperature of up to 260 ℃ when a printed circuit board (Printed Circuit Board, PCB) is attached, thereby reducing the cost and improving the performance of electronic equipment. Optionally, the microphone chip 200 is a microphone chip of a MEMS micro-electromechanical system, and the MEMS silicon microphone has the advantages of strong anti-interference capability, small output impedance, enhanced load capacity, and the like.
Optionally, fig. 5 is a schematic cross-sectional structure of a microphone according to an embodiment of the present invention, where the microphone 10 further includes a first electrode 300, a second electrode 400, a printed circuit board 500, and a housing 600. The signal multiplexing terminal S1 of the integrated circuit 100 is electrically connected to the first electrode 300, the ground terminal GND of the integrated circuit 100 is electrically connected to the second electrode 400, and the microphone chip 200, the first electrode 300, the second electrode 400 and the integrated circuit 100 are disposed on the printed circuit board 500; the housing 600 and the printed circuit board 500 define an accommodating space 601, the microphone chip 200 and the integrated circuit 100 are located in the accommodating space 601, and the first electrode 300 and the second electrode 400 are located outside the accommodating space 601; the housing 600 is provided with an acoustic port 602. The case 600 may be a metal case or the like.
The embodiment of the invention provides electronic equipment. Referring to fig. 2 or 4, the electronic device 1 includes a first power supply 20, a third resistor R3, a dc blocking circuit 30, a second voltage amplifier 40, a processor 50, and a microphone 10 provided by any embodiment of the present invention.
The output end of the first power supply 20 is electrically connected to the signal multiplexing end S1 through the third resistor R3, the input end of the dc blocking circuit 30 is electrically connected to the signal multiplexing end S1, the ground end GND is grounded, the output end of the dc blocking circuit 30 is electrically connected to the input end of the second voltage amplifier 40, the output end of the second voltage amplifier 40 is electrically connected to the processor 50, and the processor 50 is configured to process the sound signal collected by the microphone 10.
The first power source 20 may be a dc power source. The first power supply 20 may also be electrically connected to the processor to provide power to the processor. The third resistor R3 is a pull-up resistor. The dc blocking circuit 30 may be a second capacitor C, and acquires an ac voltage signal corresponding to the sound signal by a dc blocking operation. The processor 50 may be an MCU (Microcontroller Unit, micro control unit) or an FPGA (Field-Programmable gate array) or the like. The second voltage amplifier 40 may include an operational amplifier, etc., and the second voltage amplifier 40 may be used to amplify the voltage at its input terminal by a second preset multiple and output the amplified voltage to its output terminal.
The electronic device provided by the embodiment of the present invention includes the microphone in the above embodiment, so the electronic device provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and will not be described herein.
Optionally, the electronic device may further include an analog-to-digital converter, and an output terminal of the second voltage amplifier is electrically connected to an input terminal of the analog-to-digital converter, and an output terminal of the analog-to-digital converter is electrically connected to the processor. The analog-to-digital converter is used for converting an input analog signal into a digital signal and outputting the digital signal to the processor.
Optionally, the electronic device may further include a memory, electrically connected to the processor, the processor configured to write the collected sound signals to the memory, the memory configured to store the collected sound signals.
Optionally, the electronic device may further include a speaker electrically connected to the processor, and the processor is configured to control the speaker to play the collected sound signal.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. An integrated circuit for a microphone, comprising: the device comprises a signal multiplexing end, a power output end, a grounding end and a signal input end;
The integrated circuit further includes:
the voltage stabilizing circuit comprises a first input end and a first output end, wherein the first input end is electrically connected with the signal multiplexing end, and the first output end is electrically connected with the power supply output end;
The signal conversion circuit comprises a second input end and a controlled current path, wherein the second input end is electrically connected with the signal input end, and the current on the controlled current path is controlled by a voltage signal input by the second input end;
an impedance module electrically connected in series with the controlled current path;
The impedance module is electrically connected with the first end and the second end of the controlled current path after being connected in series, and is respectively and electrically connected with the signal multiplexing end and the grounding end;
The circuit further comprises a second resistor, wherein the first end of the second resistor is electrically connected with the signal multiplexing end, and the second end of the second resistor is electrically connected with the first input end of the voltage stabilizing circuit.
2. The integrated circuit for a microphone of claim 1 wherein the signal conversion circuit comprises a transistor, the impedance module comprises a first resistor, a control electrode of the transistor is electrically connected to a second input terminal of the signal conversion circuit, and the controlled current path is a path in which the first and second electrodes of the transistor are located;
the first pole of the transistor is electrically connected with the signal multiplexing end, and the second pole of the transistor is electrically connected with the grounding end through the first resistor.
3. The integrated circuit for a microphone of claim 2, wherein the transistor is a field effect transistor.
4. The integrated circuit for a microphone of claim 1, further comprising a first voltage amplifier having an input electrically connected to the signal input and an output electrically connected to a second input of the signal conversion circuit.
5. The integrated circuit for a microphone of claim 1, further comprising a boost circuit, wherein an input of the boost circuit is electrically connected to the first output of the voltage regulator circuit, and an output of the boost circuit is electrically connected to the power supply output.
6. A microphone, comprising: a microphone chip and an integrated circuit for a microphone as claimed in any of claims 1-5,
The first end of the microphone chip is electrically connected with the power supply output end of the integrated circuit, and the second end of the microphone chip is electrically connected with the signal input end of the integrated circuit.
7. The microphone of claim 6 wherein the microphone chip is a microelectromechanical system microphone chip.
8. The microphone of claim 6, further comprising: a first electrode, a second electrode, a printed circuit board and a housing,
The signal multiplexing end of the integrated circuit is electrically connected with the first electrode, the grounding end of the integrated circuit is electrically connected with the second electrode, and the microphone chip, the first electrode, the second electrode and the integrated circuit are arranged on the printed circuit board;
The shell and the printed circuit board enclose an accommodating space, the microphone chip and the integrated circuit are positioned in the accommodating space, and the first electrode and the second electrode are positioned outside the accommodating space;
And the shell is provided with an acoustic inlet.
9. An electronic device comprising a first power supply, a third resistor, a dc blocking circuit, a second voltage amplifier, a processor, and a microphone according to any of claims 6-8;
The output end of the first power supply is electrically connected with the signal multiplexing end through the third resistor, the input end of the blocking circuit is electrically connected with the signal multiplexing end, the grounding end is grounded, the output end of the blocking circuit is electrically connected with the input end of the second voltage amplifier, the output end of the second voltage amplifier is electrically connected with the processor, and the processor is used for processing sound signals collected by the microphone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910707117.6A CN110324770B (en) | 2019-08-01 | 2019-08-01 | Microphone, integrated circuit thereof and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910707117.6A CN110324770B (en) | 2019-08-01 | 2019-08-01 | Microphone, integrated circuit thereof and electronic equipment |
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| CN110324770A CN110324770A (en) | 2019-10-11 |
| CN110324770B true CN110324770B (en) | 2024-04-26 |
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| CN114598979B (en) * | 2022-05-10 | 2022-08-16 | 迈感微电子(上海)有限公司 | Double-diaphragm MEMS microphone and manufacturing method thereof |
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| CN105872904A (en) * | 2016-04-20 | 2016-08-17 | 乐视控股（北京）有限公司 | Microphone circuit, system and headset |
| CN107426658A (en) * | 2017-08-01 | 2017-12-01 | 林海 | Biasing circuit and MEMS microphone |
| CN209914063U (en) * | 2019-08-01 | 2020-01-07 | 迈感微电子(上海)有限公司 | Microphone, integrated circuit thereof and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005039041A1 (en) * | 2003-10-14 | 2005-04-28 | Audioasics A/S | Microphone preamplifier |
| DE102010054897B4 (en) * | 2010-12-17 | 2012-12-20 | Austriamicrosystems Ag | Amplifier circuit for a two-wire interface, microphone amplifier and circuit arrangement for converting a speech signal |
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| US4539441A (en) * | 1981-09-03 | 1985-09-03 | Robert Bosch Gmbh | Hearing-aid with integrated circuit electronics |
| CN102932723A (en) * | 2012-11-13 | 2013-02-13 | 山东共达电声股份有限公司 | Two-end micro-electro-mechanical system (MEMS) microphone |
| CN104284289A (en) * | 2013-07-12 | 2015-01-14 | 英飞凌科技股份有限公司 | System and Method for a Microphone Amplifier |
| CN104735587A (en) * | 2013-12-20 | 2015-06-24 | 英飞凌科技股份有限公司 | System and method for cancelation circuit |
| CN105872904A (en) * | 2016-04-20 | 2016-08-17 | 乐视控股（北京）有限公司 | Microphone circuit, system and headset |
| CN107426658A (en) * | 2017-08-01 | 2017-12-01 | 林海 | Biasing circuit and MEMS microphone |
| CN209914063U (en) * | 2019-08-01 | 2020-01-07 | 迈感微电子(上海)有限公司 | Microphone, integrated circuit thereof and electronic equipment |
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| CN110324770A (en) | 2019-10-11 |
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Effective date of registration: 20240507 Address after: 214135 China Sensor Network International Innovation Park F2, 200 Linghu Avenue, Xinwu District, Wuxi City, Jiangsu Province Patentee after: SV SENSTECH (WUXI) CO.,LTD. Country or region after: China Address before: 201313 118, 20, 1-42 Lane 83, Hongxiang North Road, Wanxiang Town, Pudong New Area, Shanghai. Patentee before: Maigan Microelectronics (Shanghai) Co.,Ltd. Country or region before: China |