Aac Acoustic Technologies (Shenzhen) Co., Ltd.

Chuationg Kee

Dong Han

The invention provides a microphone circuit, which includes an amplifier, a bias resistor and a bias network module. The first terminal of bias resistor connects to the preset bias voltage. The second end of the bias resistor connects the output end of the microphone. The bias network module is used to judge level of the voltage value of the signal. If the voltage value of the signal exceeds the preset voltage value of the threshold voltage group range, connect the impeder corresponding to the bias network module to the input end of the microphone circuit. The invention provides a microphone module and a method for raising sound pressure overload point of microphone. Compared with the related art, the technical scheme of the invention improves the sound pressure overload point of microphone and has good electrical performance.

Microphone circuit, microphone module, and method for raising sound pressure overload point of microphone

The present invention provides a single-end-to-differential microphone circuit and an electronic equipment, including: an amplifier, a microphone connected to the positive input end of the amplifier, a coupling capacitor Cconnected to the negative input end of the amplifier, a first feedback capacitor Cconnected to the negative output end of the amplifier, a first feedback resistor Rconnected in parallel with the first feedback capacitor C, a second feedback capacitor connected to the positive output end of the amplifier C, and a second feedback resistor Rconnected in parallel with the second feedback capacitor C. The circuit of the present invention can adopt a microphone structure with smaller capacity, and at the same time has a better system signal to noise ratio.

Single-end-to-differential microphone circuit and electronic equipment

The present invention provides a microphone amplifying circuit including an amplifier, a bias resistor, an input end, an output end, a microphone capacitor, a first parasitic capacitor and a second parasitic capacitor. The first parasitic capacitor is connected to the input end, and the other end of the first parasitic capacitor is connected to the output end. The second parasitic capacitor is connected to the output end, and the other end of the second parasitic capacitor is grounded. The first parasitic capacitor and the second parasitic capacitor are formed after adding a layer of underlying metal between the substrate of the integrated circuit and the welding plate. Compared with the related art, the microphone amplifying circuit design method and the microphone amplifying circuit of the present invention have higher signal to noise ratio and better performance.

Microphone amplifying circuit design method and microphone amplifying circuit

The present invention provides a single-end-to-differential microphone circuit, including a power supply end for inputting a first bias voltage, a microphone capacitor, a coupling capacitor, a first primary amplifier, a second primary amplifier, a signal processing module, current sharing amplifier, a feedback resistor at positive end, a feedback capacitor at positive end, a feedback resistor at negative end, a feedback capacitor at negative end. Compared with the prior art, the single-end-to-differential microphone circuit of the present invention can utilize the current sharing amplifier with a small input common mode voltage range and low noise to realize the single-end-to-differential of the signal, which is beneficial to improve the signal to noise ratio of the circuit.

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Chuationg Kee