CN216774966U

CN216774966U - Double-tube core capacitor microphone

Info

Publication number: CN216774966U
Application number: CN202220188266.3U
Authority: CN
Inventors: 邱香; 马胜祥
Original assignee: Shenzhen Tongyue Electronic Co ltd
Current assignee: Shenzhen Tongyue Electronic Co ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-06-17
Anticipated expiration: 2032-01-24

Abstract

The utility model provides a dual-tube-core capacitor microphone which comprises a signal acquisition capacitor, a first field effect tube core, a second field effect tube core, a first bias voltage end, a second bias voltage end, a first impedance adjusting circuit and a second impedance adjusting circuit, and further comprises a first coupling capacitor and a second coupling capacitor, wherein the first field effect tube core and the second field effect tube core are respectively and electrically connected with the signal acquisition capacitor; the second field effect transistor tube core is electrically connected with a second bias voltage end, the second field effect transistor tube core is electrically connected with a second impedance adjusting circuit, and the second impedance adjusting circuit is electrically connected with a second coupling capacitor.

Description

Double-tube core capacitance microphone

Technical Field

The utility model relates to a double-tube-core capacitor microphone.

Background

A dual-die condenser microphone in the prior art is mainly applicable to a case where a camera microphone interface and a mobile phone microphone interface are different, for example, as shown in fig. 1, a drain electrode of a first die in the dual-die microphone in the prior art is connected to left and right sound channel electrodes of a TRRS connector, a drain electrode of a second die is connected to a mic microphone electrode of the TRRS connector, a 3 rd electrode of the TRRS connector is grounded, and a ground electrode and a mic microphone electrode of the TRRS connector are used for the microphone interface of the mobile phone. The microphone interface of the camera uses the left and right sound channel poles and the grounding pole, when the microphone interface of the camera is connected, the camera applies bias voltage to the left and right sound channel poles and the grounding pole, the microphone works and outputs sound signals.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model provides a double-tube core capacitance microphone, and the technical scheme adopted by the utility model for solving the technical problems is as follows: the microphone comprises a signal acquisition capacitor, a first field effect tube core, a second field effect tube core, a first bias voltage end, a second bias voltage end, a first impedance adjusting circuit, a second impedance adjusting circuit, a first coupling capacitor and a second coupling capacitor, wherein the first field effect tube core and the second field effect tube core are respectively and electrically connected with the signal acquisition capacitor; the second field effect transistor tube core is electrically connected with a second bias voltage end, the second field effect transistor tube core is electrically connected with a second impedance adjusting circuit, and the second impedance adjusting circuit is electrically connected with a second coupling capacitor; the first coupling capacitor and the second coupling capacitor are used for signal output. And further, the control grids of the first field effect tube core and the second field effect tube core are respectively and electrically connected with the output electrode of the signal acquisition capacitor. Furthermore, the first impedance adjusting circuit and the second impedance adjusting circuit both adopt externally arranged potentiometers. And the source electrodes of the first field effect tube core and the second field effect tube core are respectively grounded and electrically connected with the TRRS interface. The first impedance adjusting circuit is electrically connected in series with the drain of the first field effect transistor die, and the second impedance adjusting circuit is electrically connected in series with the drain of the second field effect transistor die. Further, the first bias voltage terminal and the second bias voltage terminal may adopt the same bias voltage terminal, wherein one bias voltage terminal is connected in series with an impedance element to equalize the voltage source.

The utility model has the advantages that the external potentiometer is connected with the output signal of the tube core of the field effect tube in series, and the impedance of the branch where the output signal is positioned can be changed by adjusting the knob, so that the electric signal is improved. A set of fixing holes are respectively formed in the upper side and the lower side of the circular circuit board, and an external potentiometer is fixed on each set of fixing holes.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic circuit diagram of a microphone in the prior art.

FIG. 2 is a block diagram of a circuit according to an embodiment of the present invention.

Detailed Description

Embodiment 1, as shown in fig. 2, the present invention includes a signal collecting capacitor, a first fet die, a second fet die, a first bias voltage terminal, a second bias voltage terminal, a first impedance adjusting circuit, a second impedance adjusting circuit, a first coupling capacitor, and a second coupling capacitor, where the first fet die and the second fet die are electrically connected to the signal collecting capacitor, the signal collecting capacitor is configured to collect a microphone signal, the first fet die is electrically connected to the first bias voltage terminal, the first fet die is electrically connected to the first impedance adjusting circuit, and the first impedance adjusting circuit is electrically connected to the first coupling capacitor; the second field effect transistor tube core is electrically connected with a second bias voltage end, the second field effect transistor tube core is electrically connected with a second impedance adjusting circuit, and the second impedance adjusting circuit is electrically connected with a second coupling capacitor; the first coupling capacitor and the second coupling capacitor are used for signal output.

Embodiment 2, as shown in fig. 2, the present invention further includes a first coupling capacitor and a second coupling capacitor, where the first field effect transistor die and the second field effect transistor die are electrically connected to the signal collection capacitor, the signal collection capacitor is used to collect microphone signals, the first field effect transistor die is electrically connected to the first bias voltage terminal, the first field effect transistor die is electrically connected to the first impedance adjustment circuit, and the first impedance adjustment circuit is electrically connected to the first coupling capacitor; the second field effect transistor tube core is electrically connected with a second bias voltage end, the second field effect transistor tube core is electrically connected with a second impedance adjusting circuit, and the second impedance adjusting circuit is electrically connected with a second coupling capacitor; the first coupling capacitor and the second coupling capacitor are used for signal output. The control grids of the first field effect tube core and the second field effect tube core are respectively and electrically connected with the output electrode of the signal acquisition capacitor, further, the source electrodes of the first field effect tube core and the second field effect tube core are respectively grounded and electrically connected with the TRRS interface, further, the first impedance adjusting circuit is electrically connected in series with the drain electrode of the first field effect tube core, and the second impedance adjusting circuit is electrically connected in series with the drain electrode of the second field effect tube core. The first impedance adjusting circuit and the second impedance adjusting circuit both adopt externally-arranged potentiometers. In the specific implementation of the utility model, the signal acquisition capacitor acquires the sound signal of the microphone and converts the sound signal into an electric signal, and the electric signal is input to the first field effect tube core and the second field effect tube core, and the first field effect tube core and the second field effect tube core are driven by the bias voltage and then output signals to the first coupling capacitor and the second coupling capacitor after passing through the first impedance adjusting circuit and the second impedance adjusting circuit, wherein the first impedance adjusting circuit and the second impedance adjusting circuit can stably adjust the impedance before the signal is coupled and output, thereby controlling the output of high-quality and stable signals. In addition, the external potentiometer can be conveniently and manually adjusted.

Embodiment 3, as shown in fig. 2, the present invention further includes a first coupling capacitor and a second coupling capacitor, where the first field effect transistor die and the second field effect transistor die are electrically connected to the signal collection capacitor, the signal collection capacitor is used to collect microphone signals, the first field effect transistor die is electrically connected to the first bias voltage terminal, the first field effect transistor die is electrically connected to the first impedance adjustment circuit, and the first impedance adjustment circuit is electrically connected to the first coupling capacitor; the second field effect transistor tube core is electrically connected with a second bias voltage end, the second field effect transistor tube core is electrically connected with a second impedance adjusting circuit, and the second impedance adjusting circuit is electrically connected with a second coupling capacitor; the first coupling capacitor and the second coupling capacitor are used for signal output. The first bias voltage terminal and the second bias voltage terminal can adopt the same bias voltage terminal, wherein one bias voltage terminal is connected with an impedance element in series to balance a voltage source. Principle of embodiments of the utility model in specific implementation of the utility model, the signal acquisition capacitor acquires a voice signal of the microphone, converts the voice signal into an electric signal, and inputs the electric signal to the first field effect transistor die and the second field effect transistor die, the first field effect transistor die and the second field effect transistor die are driven by a bias voltage, and then output signals to the first coupling capacitor and the second coupling capacitor after passing through the first impedance adjusting circuit and the second impedance adjusting circuit, wherein the first impedance adjusting circuit and the second impedance adjusting circuit can stably adjust impedance before signal coupling output so as to control output of a high-quality stable signal. It will be appreciated by those skilled in the art that the utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

The embodiments disclosed above are illustrative and not exclusive in all respects. All changes which come within the scope of or are equivalent to the scope of the utility model are intended to be embraced therein.

Claims

1. A dual-die condenser microphone is characterized in that: the microphone comprises a signal acquisition capacitor, a first field effect tube core, a second field effect tube core, a first bias voltage end, a second bias voltage end, a first impedance adjusting circuit and a second impedance adjusting circuit, and further comprises a first coupling capacitor and a second coupling capacitor, wherein the first field effect tube core and the second field effect tube core are respectively electrically connected with the signal acquisition capacitor, the signal acquisition capacitor is used for acquiring microphone signals, the first field effect tube core is electrically connected with the first bias voltage end, the first field effect tube core is electrically connected with the first impedance adjusting circuit, and the first impedance adjusting circuit is electrically connected with the first coupling capacitor; the second field effect transistor tube core is electrically connected with a second bias voltage end, the second field effect transistor tube core is electrically connected with a second impedance adjusting circuit, and the second impedance adjusting circuit is electrically connected with a second coupling capacitor; the first coupling capacitor and the second coupling capacitor are used for signal output.

2. A dual die capacitive microphone according to claim 1, wherein: and the control grids of the first field effect tube core and the second field effect tube core are respectively and electrically connected with the output electrode of the signal acquisition capacitor.

3. A dual die capacitive microphone according to claim 1, wherein: the first impedance adjusting circuit and the second impedance adjusting circuit both adopt externally-arranged potentiometers.

4. A dual die capacitive microphone according to claim 1, wherein: and the source electrodes of the first field effect tube core and the second field effect tube core are respectively grounded and electrically connected with the TRRS interface.

5. A dual die capacitive microphone according to claim 1, wherein: the first impedance adjusting circuit is electrically connected in series with the drain electrode of the first field effect transistor tube core, and the second impedance adjusting circuit is electrically connected in series with the drain electrode of the second field effect transistor tube core.

6. A dual die capacitive microphone according to claim 1, wherein: the first bias voltage terminal and the second bias voltage terminal can adopt the same bias voltage terminal, wherein one bias voltage terminal is connected with an impedance element in series to balance a voltage source.