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Op amp based acoustic circuit

A technology of amplifying circuits and circuits, applied in transducer circuits, sensors, electrical components, etc., can solve the problems of component accurate value floating, poor consistency, and high cost, and achieve stable circuit output waveforms, reduce complexity, and circuit stability. Effect

Active Publication Date: 2020-08-14
SHANGHAI TAIXI ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Today's sound-sensing circuits are all built from external discrete components. This kind of circuit is very complicated, and because the exact value of the components fluctuates greatly and the consistency is poor, each product needs to be debugged, and the cost is relatively high. High, not suitable for mass production

Method used

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  • Op amp based acoustic circuit
  • Op amp based acoustic circuit
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Embodiment Construction

[0061] In order to better understand the technical content of the present invention, specific examples are given and described as follows in conjunction with the accompanying drawings.

[0062] See figure 1As shown, this is the electrical schematic diagram of the acoustic sensing circuit based on the operational amplifier of the present invention. The acoustic sensing circuit based on the operational amplifier of the present invention includes a sound signal detection circuit, a primary amplifier circuit, a signal processing circuit, a secondary amplifier circuit and a shaping circuit. The enable signal CE controls the working states of M1, operational amplifier 1, operational amplifier 2 and the Schmidt shaping circuit. The positive terminal of the microphone (microphone) MC is connected to the input voltage Vin, the negative terminal is connected to the drain of M1 through the resistor R1, the source level substrate of M1 is grounded, the gate of M1 is connected to the cont...

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Abstract

The invention proposes a sound sensing circuit based on an operational amplifier, which is used for detecting sound and generating a sound sensing signal. The sound sensing circuit comprises a sound signal detection circuit, a one-stage amplification circuit, a signal processing circuit, a two-stage amplification circuit and a shaping circuit. The sound signal detection circuit generates an electrical signal through a voice input device and then sends the electrical signal to the one-stage amplification circuit; and after the electrical signal is amplified, the electrical signal is processed by the signal processing circuit, specifically including that a capacitor C3 performs AC coupling on the signal and a capacitor C4 performs envelope detection on the signal and then the two-stage amplification circuit amplifies the signal, after that, a shaping signal is generated by a Schmidt shaping circuit in the shaping circuit and the shaping signal is outputted by an inverter. After detection, the sound sensing circuit based on the operational amplifier provided by the invention effectively identifies sound signals with a frequency below 20kHz; moreover, the power consumption of the circuit is low, and the quiescent current is about 250muA; and since the circuit has an enable pin, the working state of the circuit can be controlled by signals, thus the overall power consumption can be reduced in combination with other chip applications.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to an acoustic sensing circuit based on an operational amplifier Background technique [0002] Today's sound-sensing circuits are all built from external discrete components. This kind of circuit is very complicated, and because the exact value of the components fluctuates greatly and the consistency is poor, each product needs to be debugged, and the cost is relatively high. High, not suitable for mass production. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an acoustic sensing circuit based on an operational amplifier to solve the above problems. [0004] In order to achieve the above object, the present invention provides the following technical solutions: [0005] A sound-sensing circuit based on an operational amplifier is characterized in that it includes a sound signal detection circuit, a primary amplifier...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
CPCH04R3/00H04R2420/01
Inventor 韩志刚阴智昊池增奇肖伟华
Owner SHANGHAI TAIXI ELECTRONICS TECH
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