Microphone amplifier circuit

A microphone amplifier and circuit technology, which is applied to transducer circuits, sensors, electrical components, etc., can solve the problems of low sensitivity of the microphone system and high noise of the microphone amplifier circuit itself, so as to reduce the loss of AC voltage gain, improve the signal-to-noise ratio, The effect of increasing the amplitude

Active Publication Date: 2016-12-21
AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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AI Technical Summary

Problems solved by technology

[0003] In the microphone amplifier circuit of the related art, the power supply rejection ratio (Power Supply Rejection Ratio, PSRR) of the power supply at 217 Hz determines the coupling ability of the noise from the power supply to the output, and the related microphone system using the related microphone amplifier circuit generally can only reach 66

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  • Microphone amplifier circuit

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] see figure 1 , is a circuit structure diagram of a microphone amplifier circuit in a preferred embodiment of the present invention. The present invention provides a microphone amplifier circuit 10, including a first transistor M 1 , the second transistor M 2 , the third transistor M 3 , the fourth transistor M 4 , the fifth transistor M 5 , the sixth transistor M 6 , the seventh transistor M 7 , the eighth transistor M8, the diode D 1 and resistor R 1 .

[0026] The first transistor M 1 The gate of the microphone amplifier circuit 10 receives the input signal V as the input IN , the second transistor M 2 The source of the microphone amplifier circuit 10 transmits the output signal V as the output OUT .

[0027] The first transistor M 1 The source is connected to the seventh transistor M 7 the drain of the first transistor M 1 The...

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Abstract

The invention provides a microphone amplifier circuit, which comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a diode and a resistor, and is characterized in that a grid electrode of the first transistor acts as an input end of the microphone amplifier circuit, and a source electrode of the second transistor acts as an output end of the microphone amplifier circuit. The fifth transistor, the sixth transistor, the seventh transistor, the eighth transistor and the resistor form a bias circuit which is used for generating bias current and providing required current for the first transistor M1 and the second transistor M2 which act as source followers, and the second transistor M2 adopts a deep-N-well NMOS (N-channel metal oxide semiconductor) transistor to generate a back gate effect. Compared with related technologies, the microphone amplifier circuit provided by the invention has the advantages of low current consumption and high SNR (Signal to Noise Ratio).

Description

【Technical field】 [0001] The invention relates to an amplifier circuit, in particular to a microphone amplifier circuit used in MEMS technology. 【Background technique】 [0002] The microphone amplifier circuit mainly includes a MEMS sensor and an ASIC (Application-Specific Integrated Circuit, Application-Specific Integrated Circuit), both of which are electrically connected to convert sound signals into electrical signals to realize the function of the microphone. [0003] In the microphone amplifier circuit of the related art, the power supply rejection ratio (Power Supply Rejection Ratio, PSRR) of the power supply at 217 Hz determines the coupling ability of the noise from the power supply to the output, and the related microphone system using the related microphone amplifier circuit generally can only reach 66.5 dB signal-to-noise ratio (Signal-Noise-Ratio, SNR). [0004] One of the reasons for the low relative SNR is the relatively high self-noise of the relevant microp...

Claims

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Application Information

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IPC IPC(8): H04R3/00
CPCH04R3/00H04R2420/01
Inventor 韩冬蔡东记
Owner AAC ACOUSTIC TECH (SHENZHEN) CO LTD
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