CN113660579A - ASIC chip and MEMS microphone - Google Patents
ASIC chip and MEMS microphone Download PDFInfo
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- CN113660579A CN113660579A CN202110879886.1A CN202110879886A CN113660579A CN 113660579 A CN113660579 A CN 113660579A CN 202110879886 A CN202110879886 A CN 202110879886A CN 113660579 A CN113660579 A CN 113660579A
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- 230000035945 sensitivity Effects 0.000 claims abstract description 125
- 230000005236 sound signal Effects 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000003321 amplification Effects 0.000 claims description 25
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 abstract description 14
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/02—Microstructural systems; Auxiliary parts of microstructural devices or systems containing distinct electrical or optical devices of particular relevance for their function, e.g. microelectro-mechanical systems [MEMS]
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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
- H04R19/04—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
Abstract
The invention discloses an ASIC chip and an MEMS microphone, wherein the ASIC chip comprises an amplifying module, an analog-to-digital conversion module and a sensitivity compensation module, wherein the amplifying module acquires an analog audio signal and amplifies the analog audio signal, the analog-to-digital conversion module converts the amplified analog audio signal into a digital audio signal, the sensitivity compensation module detects the working sensitivity of the analog-to-digital conversion module, compares the working sensitivity with a preset sensitivity, and adjusts the working sensitivity of the amplifying module according to the difference between the working sensitivity and the preset sensitivity when the difference between the working sensitivity and the preset sensitivity is larger than the preset difference. The technical problem that the sensitivity adjusting process of the ASIC chip is complex is solved by the scheme.
Description
Technical Field
The invention relates to the technical field of microphones, in particular to an ASIC (application specific integrated circuit) chip and an MEMS (micro-electromechanical system) microphone.
Background
The MEMS MIC is an acoustic component for converting an acoustic signal into an electrical signal, and includes a Micro Electro Mechanical Systems (MEMS) and an Application Specific Integrated Circuit (ASIC), wherein the ASIC chip provides a stable working voltage for the MEMS and amplifies the acoustic signal of the MEMS, and a calibration method of the conventional ASIC requires that data of a required calibration sensitivity is sent to the ASIC after the ASIC is output through a production measurement tester to complete calibration. The pins are required to be added to meet the requirement of the transmission interface, and the process of calibrating the sensitivity is complicated.
Disclosure of Invention
The invention mainly aims to provide an intelligent calibration microphone control method, and aims to solve the technical problem that the sensitivity adjustment process of an ASIC chip is complex.
To achieve the above object, the present invention provides an ASIC chip, including:
the amplifying module is used for acquiring an analog audio signal and amplifying the analog audio signal;
the analog-to-digital conversion module is used for converting the amplified analog audio signal into a digital audio signal; and the number of the first and second groups,
and the sensitivity compensation module is used for detecting the working sensitivity of the analog-to-digital conversion module, comparing the working sensitivity with the preset sensitivity, and adjusting the working sensitivity of the amplification module according to the difference between the working sensitivity and the preset sensitivity when the difference between the working sensitivity and the preset sensitivity is greater than the preset difference.
Optionally, the output end of the sensor is connected with the input end of the amplification module; the input end of the analog-to-digital conversion module is connected with the output end of the amplification module, and the output end of the analog-to-digital conversion module is connected with the input end of the sensitivity compensation module; and the input end of the sensitivity compensation module is connected with the feedback input end of the amplification module.
Optionally, the amplifying module is an amplifier.
Optionally, the analog-to-digital conversion module is an analog-to-digital converter.
Optionally, the sensitivity compensation module includes a signal power detection module and a sensitivity compensation branch, an input end of the signal power detection module is an input end of the sensitivity compensation module, and an output end of the signal power detection module is connected to an input end of the sensitivity compensation branch; the output end of the sensitivity compensation branch circuit is the output end of the sensitivity compensation module;
the power detection module; the working sensitivity of the analog-to-digital converter is detected;
and the sensitivity compensation branch is used for adjusting the gain of the amplification module according to the difference value of the working sensitivity and the preset sensitivity so as to adjust the working sensitivity of the amplification module.
Optionally, the signal power detection module is a signal power detector.
Optionally, the gain compensation value of the sensitivity compensation module to the amplification module is implemented based on the following formula:
and recording the working sensitivity of the ASIC as X, the preset sensitivity as Y, and the gain compensation value as Z:
the gain compensation value is determined according to the following formula:
Z＝Y-X。
in order to achieve the above object, the present invention further provides a MEMS microphone, which includes a MEMS chip and the ASIC chip as described above, wherein the ASIC chip is electrically connected to the MEMS chip;
the MEMS chip is used for converting the acoustic signal into an audio signal;
and the ASIC chip is used for amplifying the audio signal.
The ASIC chip comprises an amplifying module, an analog-to-digital conversion module and a sensitivity compensation module, wherein the amplifying module acquires an analog audio signal and amplifies the analog audio signal, the analog-to-digital conversion module converts the amplified analog audio signal into a digital audio signal, the sensitivity compensation module detects the working sensitivity of the analog-to-digital conversion module, compares the working sensitivity with a preset sensitivity, and adjusts the working sensitivity of the amplifying module according to the difference between the working sensitivity and the preset sensitivity when the difference between the working sensitivity and the preset sensitivity is larger than the preset difference. In the embodiment, the sensitivity compensation module is arranged on the ASIC chip, so that the ASIC chip can automatically adjust and adjust the sensitivity in real time, and the adjustment is realized without a production tester, thereby solving the technical problem that the sensitivity adjustment process of the ASIC chip is complex.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of an ASIC chip of the present invention;
FIG. 2 is a block diagram of an ASIC chip of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention, and if there is a description related to "first", "second", and the like in the embodiments of the present invention, the description of "first", "second", and the like is only used for descriptive purposes and is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The invention provides an ASIC chip, aiming at solving the technical problem that the sensitivity adjustment process of the ASIC chip is complex.
In an embodiment, as shown in fig. 1, the ASIC chip includes an amplifying module 10, an analog-to-digital conversion module 20, and a sensitivity compensation module 30, and the amplifying module 10 acquires an analog audio signal and amplifies the analog audio signal. The analog-to-digital conversion module 20 converts the amplified analog audio signal into a digital audio signal. The sensitivity compensation module 30 detects the working sensitivity of the analog-to-digital conversion module 20, compares the working sensitivity with a preset sensitivity, and adjusts the working sensitivity of the amplification module 10 according to the difference between the working sensitivity and the preset sensitivity when the difference between the working sensitivity and the preset sensitivity is greater than the preset difference.
In the above embodiment, the sensitivity compensation module 30 is disposed on the ASIC chip, so that the ASIC chip can automatically adjust and adjust the sensitivity in real time, and the adjustment is not implemented by a production tester, thereby solving the technical problem that the sensitivity adjustment process of the ASIC chip is complicated.
It should be noted that any connection relationship for implementing signal transmission between the functional circuits may be used, and is not limited, in this embodiment, the following connection relationship is used for implementing signal transmission between the functional circuits, specifically, the output end of the sensor is connected to the input end of the amplification module 10; the input end of the analog-to-digital conversion module 20 is connected with the output end of the amplification module 10, and the output of the analog-to-digital conversion module 20 is connected with the input end of the sensitivity compensation module 30. The input end of the sensitivity compensation module 30 is connected to the feedback input end of the amplification module 10.
Optionally, the amplifying module 10 is an amplifier. In this case, the amplifier module 10 is directly set as an amplifier, which can reduce the circuit complexity of the ASIC chip and simplify the circuit.
Optionally, the analog-to-digital conversion module 20 is an analog-to-digital converter. At this time, the analog-to-digital conversion module 20 is directly set as an analog-to-digital converter, which can reduce the circuit complexity of the ASIC chip and simplify the circuit.
Optionally, as shown in fig. 2, the sensitivity compensation module 30 includes a signal power detection module 301 and a sensitivity compensation branch 302, an input end of the signal power detection module 301 is an input end of the sensitivity compensation module 30, and an output end of the signal power detection module 301 is connected to an input end of the sensitivity compensation branch 302; the output end of the sensitivity compensation branch 302 is the output end of the sensitivity compensation module 30.
The signal power detection module 301 detects the working sensitivity of the analog-to-digital converter, and the sensitivity compensation branch 302 adjusts the gain of the amplification module 10 according to the difference between the working sensitivity and the preset sensitivity, so as to adjust the working sensitivity of the amplification module, and thus realize the feedback adjustment of the working sensitivity. The improved ASIC chip is used for the MEMS microphone, the sensitivity of the MEMS microphone can be ensured within a very narrow tolerance range of +/-1dB, external period auxiliary adjustment is not needed, and in addition, if the improved MEMS microphone is used for forming a microphone array, the sensitivity can be ensured within the very narrow tolerance range of +/-1dB due to built-in calibration of the MEMS microphone, and in far-field pickup application, a sound pickup area can be focused on a specific far-field sound source, and noise interference of the surrounding environment is eliminated.
Optionally, the signal power detection module 301 is a signal power detector.
Optionally, the gain compensation value of the sensitivity compensation module to the amplification module is implemented based on the following formula:
and recording the working sensitivity of the ASIC as X, the preset sensitivity as Y, and the gain compensation value as Z:
the gain compensation value is determined according to the following formula:
Z＝Y-X。
in the compensation process, the sensitivity compensation module can adjust the sensitivity of the amplification module by adjusting the gain or bias voltage of the amplification module, thereby realizing automatic calibration, and because the process does not involve a more complicated sensitivity calculation process, the sensitivity can be detected only by a signal power detector, and then the gain compensation value can be adjusted by the amplification module arranged on an ASIC chip, thereby solving the problem that other equipment is required to adjust the sensitivity, so that a user can compensate the sensitivity of the equipment at any time according to the use and test conditions, in addition, the sensitivity compensation process is simpler, the sensitivity compensation can be realized without a control chip with higher cost, and the measurement of the sensitivity of the application is to directly measure the sensitivity of the analog-to-digital conversion module 20 on the same chip without a connecting wire, thereby sensitivity measuring error that contact failure caused has been avoided, and this application can reduce the connection process and abandon dedicated production testing tool, and on reducing the process and reducing test equipment cost's basis, still guarantee original intelligent calibration level, also can carry out intelligent calibration to ASIC chip's sensitivity of work when using, has improved ASIC chip's intelligent degree greatly. It should be noted that the sensitivity compensation module may be composed of a control chip and a voltage regulation circuit, where the control chip and the voltage regulation circuit may both be a chip that can be implemented in the prior art and a circuit having a voltage regulation function. In addition, the sensitivity compensation module can also be composed of a control chip and an automatic gain control circuit, wherein the control chip can be realized in the prior art, the automatic gain control circuit can be composed of a plurality of resistance branches of a control circuit control access circuit, and the control chip can also be selected from the automatic gain control circuit of the existing amplifier.
In order to achieve the above object, the present invention further provides a MEMS microphone, which includes a MEMS chip 40 and the ASIC chip as described above, and the ASIC chip is electrically connected to the MEMS chip 40.
In the improved MEMS microphone, the MEMS chip 40 converts the acoustic signal into an audio signal, and the ASIC chip amplifies the audio signal. It should be noted that, since the MEMS microphone of the present invention includes all embodiments of the ASIC chip, the MEMS microphone of the present invention has all the advantages of the ASIC chip, and thus, the description thereof is omitted here.
Therefore, the improved MEMS microphone is used for a plurality of microphones to form a microphone array, the sensitivity can be ensured within an extremely narrow tolerance range of +/-1dB due to the built-in calibration of the MEMS microphone, and in a far-field pickup application, a sound pickup area can be focused on a specific far-field sound source, and noise interference of the surrounding environment is eliminated.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. An ASIC chip, wherein the ASIC chip comprises:
the amplifying module is used for acquiring an analog audio signal and amplifying the analog audio signal;
the analog-to-digital conversion module is used for converting the amplified analog audio signal into a digital audio signal; and the number of the first and second groups,
and the sensitivity compensation module is used for detecting the working sensitivity of the analog-to-digital conversion module, comparing the working sensitivity with a preset sensitivity, and adjusting the working sensitivity of the amplification module according to the difference between the working sensitivity and the preset sensitivity when the difference between the working sensitivity and the preset sensitivity is greater than the preset difference.
2. The ASIC chip of claim 1, wherein an output of the sensor is connected to an input of the amplification module; the input end of the analog-to-digital conversion module is connected with the output end of the amplification module, and the output end of the analog-to-digital conversion module is connected with the input end of the sensitivity compensation module; and the input end of the sensitivity compensation module is connected with the feedback input end of the amplification module.
3. The ASIC chip of claim 2, wherein the amplification module is an amplifier.
4. The ASIC chip of claim 2, wherein the analog-to-digital conversion module is an analog-to-digital converter.
5. An ASIC chip according to any of claims 1-4, wherein said sensitivity compensation module comprises a signal power detection module and a sensitivity compensation branch, an input of said signal power detection module being an input of said sensitivity compensation module, an output of said signal power detection module being connected to an input of said sensitivity compensation branch; the output end of the sensitivity compensation branch circuit is the output end of the sensitivity compensation module;
the power detection module; the working sensitivity of the analog-to-digital converter is detected;
and the sensitivity compensation branch is used for adjusting the gain of the amplification module according to the difference value of the working sensitivity and the preset sensitivity so as to adjust the working sensitivity of the amplification module.
6. An ASIC chip as defined in claim 5, wherein said signal power detection module is a signal power detector.
7. The ASIC chip of claim 5, wherein the sensitivity compensation module achieves a gain compensation value for the amplification module based on the following equation:
and recording the working sensitivity of the ASIC as X, the preset sensitivity as Y, and the gain compensation value as Z:
the gain compensation value is determined according to the following formula:
Z＝Y-X。
8. a MEMS microphone, comprising a MEMS chip and an ASIC chip according to any of claims 1 to 7, the ASIC chip being electrically connected to the MEMS chip;
the MEMS chip is used for converting the acoustic signal into an audio signal;
and the ASIC chip is used for amplifying the audio signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110879886.1A CN113660579A (en) | 2021-07-30 | 2021-07-30 | ASIC chip and MEMS microphone |
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| CN202110879886.1A CN113660579A (en) | 2021-07-30 | 2021-07-30 | ASIC chip and MEMS microphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543975A (en) * | 2022-01-25 | 2022-05-27 | 青岛歌尔智能传感器有限公司 | Sensitivity calibration circuit, calibration method and device |
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| CN103052015A (en) * | 2012-12-06 | 2013-04-17 | 山东共达电声股份有限公司 | Method for realizing sensitivity consistence of microphone and adjustable-gain microphone |
| CN106059509A (en) * | 2012-04-16 | 2016-10-26 | 英飞凌科技股份有限公司 | System and integrated circuit for amplifying signal provided by capacitive signal source |
| CN110113019A (en) * | 2019-04-29 | 2019-08-09 | 深圳锐越微技术有限公司 | Two-stage audio gain circuit and voice frequency terminal based on analog-to-digital conversion |
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- 2021-07-30 CN CN202110879886.1A patent/CN113660579A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059509A (en) * | 2012-04-16 | 2016-10-26 | 英飞凌科技股份有限公司 | System and integrated circuit for amplifying signal provided by capacitive signal source |
| CN103052015A (en) * | 2012-12-06 | 2013-04-17 | 山东共达电声股份有限公司 | Method for realizing sensitivity consistence of microphone and adjustable-gain microphone |
| CN110113019A (en) * | 2019-04-29 | 2019-08-09 | 深圳锐越微技术有限公司 | Two-stage audio gain circuit and voice frequency terminal based on analog-to-digital conversion |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543975A (en) * | 2022-01-25 | 2022-05-27 | 青岛歌尔智能传感器有限公司 | Sensitivity calibration circuit, calibration method and device |
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