CN202721721U - Mobile phone microphone control circuit - Google Patents
Mobile phone microphone control circuit Download PDFInfo
- Publication number
- CN202721721U CN202721721U CN 201220353830 CN201220353830U CN202721721U CN 202721721 U CN202721721 U CN 202721721U CN 201220353830 CN201220353830 CN 201220353830 CN 201220353830 U CN201220353830 U CN 201220353830U CN 202721721 U CN202721721 U CN 202721721U
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- Prior art keywords
- mobile phone
- field effect
- electrode
- control circuit
- pass filter
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Abstract
The utility model is suitable for the technical field of microphones and provides a mobile phone microphone control circuit. The mobile phone microphone control circuit comprises a field effect tube according to which the drain electrode and source electrode are respectively electrically connected with the positive electrode and negative electrode of a power supply, a parallel plate capacitor which is electrically connected between the gate electrode and source electrode of the field effect tube, a first capacitor arranged between the drain electrode and source electrode of the field effect tube, and an RC low-pass filter. The RC low-pass filter comprises a second capacitor which is connected between the positive electrode and negative electrode of the power supply and a resistor which is connected between the drain electrode of the field effect tube and the positive electrode of the power supply. The mobile phone microphone control circuit adopts the RC low-pass filter, and the RC low-pass filter filters out an alternating current input signal which is generated by that a high frequency signal enters a microphone circuit, thus the performance of the microphone is improved and the call quality of the mobile phone is improved.
Description
Technical field
The present invention relates to the mike technique field, relate in particular to a kind of mobile phone microphone control circuit.
Background technology
Mobile phone generally all is provided with antenna, and this antenna is used for the transmitting-receiving signal, and is perhaps external, perhaps built-in.
The setting of existing antenna for mobile phone, nearer apart from microphone, the user is when using mobile phone communication, antenna for mobile phone transmits high-frequency signal, can produce an AC signal when high-frequency signal enters the mobile phone circuit, cause partner to listen drone noise, affect the performance of microphone, and then have influence on the speech quality of both call sides, make troubles to the cellphone subscriber.
The utility model content
The purpose of this utility model is to provide a kind of mobile phone microphone control circuit, is intended to solve the prior art antenna for mobile phone and easily the service behaviour of loud speaker is exerted an influence, the problem that causes speech quality to reduce.
The utility model is achieved in that a kind of mobile phone microphone control circuit, and described mobile phone microphone control circuit comprises:
Field effect transistor, the drain electrode of described field effect transistor and source electrode are electrically connected to respectively positive source and negative pole;
Be connected electrically in the grid of described field effect transistor and the plane-parallel capacitor between the source electrode;
Be arranged on the drain electrode of described field effect transistor and the first electric capacity between the source electrode;
The RC low pass filter;
Described RC low pass filter comprises and is connected to the second electric capacity between positive source and the negative pole and is connected to resistance between the drain electrode of described field effect transistor and the described positive source.
Mobile phone microphone control circuit that the utility model provides adopts the RC low pass filter, and this RC low filter filtering is because high-frequency signal enters the ac input signal that the microphone circuit produces, and has improved the performance of microphone and has improved the speech quality of mobile phone.
Description of drawings
Fig. 1 is the circuit structure diagram of the mobile phone microphone control circuit that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 shows the circuit structure diagram of the mobile phone microphone control circuit that the utility model provides, and for convenience of explanation, has only provided the part relevant with the utility model among the figure.
The mobile phone microphone control circuit that the utility model provides comprises:
Field effect transistor JFET, the drain electrode of this field effect transistor JFET and source electrode are electrically connected to respectively positive source V+ and negative pole V-;
Plane-parallel capacitor Cd is connected between the grid and source electrode of field effect transistor JFET;
The first capacitor C 1 is arranged between the drain electrode and source electrode of field effect transistor JFET;
The RC low pass filter;
This RC low pass filter comprise be connected to the second capacitor C 2 between positive source V+ and the negative pole V-and be connected to field effect transistor JFET drain electrode and positive source V+ between resistance R.
In this embodiment, above-mentioned RC low pass filter will the filtering AC signal, thereby avoids buzz.Improve speech quality, be user-friendly to.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (1)
1. a mobile phone microphone control circuit is characterized in that, described mobile phone microphone control circuit comprises:
Field effect transistor, the drain electrode of described field effect transistor and source electrode are electrically connected to respectively positive source and negative pole;
Be connected electrically in the grid of described field effect transistor and the plane-parallel capacitor between the source electrode;
Be arranged on the drain electrode of described field effect transistor and the first electric capacity between the source electrode;
The RC low pass filter;
Described RC low pass filter comprises and is connected to the second electric capacity between positive source and the negative pole and is connected to resistance between the drain electrode of described field effect transistor and the described positive source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220353830 CN202721721U (en) | 2012-07-20 | 2012-07-20 | Mobile phone microphone control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220353830 CN202721721U (en) | 2012-07-20 | 2012-07-20 | Mobile phone microphone control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202721721U true CN202721721U (en) | 2013-02-06 |
Family
ID=47623523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220353830 Expired - Fee Related CN202721721U (en) | 2012-07-20 | 2012-07-20 | Mobile phone microphone control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202721721U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763663A (en) * | 2014-02-18 | 2014-04-30 | 山东共达电声股份有限公司 | Microphone and electronic equipment |
-
2012
- 2012-07-20 CN CN 201220353830 patent/CN202721721U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763663A (en) * | 2014-02-18 | 2014-04-30 | 山东共达电声股份有限公司 | Microphone and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130206 Termination date: 20130720 |