Echo amplification circuit of low-noise MEMS piezoelectric hydrophone

A technique for amplifying circuits and hydrophones, applied in improving amplifiers to reduce temperature/power supply voltage changes, amplifier combinations, radio wave measurement systems, etc., can solve the problems of high cost and large volume, and achieve easy operation and improved signal-to-noise ratio, good circuit stability

Active Publication Date: 2020-07-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional hydrophone has the advantage of high sensitivity and occupies the mainstream position in the market, but it has the disadvantages of high cost, large volume, and difficulty in forming an array to cover a large area of ​​sea area.

Method used

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  • Echo amplification circuit of low-noise MEMS piezoelectric hydrophone
  • Echo amplification circuit of low-noise MEMS piezoelectric hydrophone
  • Echo amplification circuit of low-noise MEMS piezoelectric hydrophone

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Embodiment Construction

[0018] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and specific embodiments.

[0019] attached figure 1 It is a schematic diagram of a MEMS piezoelectric hydrophone low-noise amplifier circuit provided by the embodiment of the present invention. The echo amplifier circuit is used in the MEMS piezoelectric hydrophone, and the receiving sensitivity of the hydrophone chip is low in the low frequency band, so it is necessary to design a signal amplifier circuit to amplify the signal picked up by the piezoelectric sensor to improve the hydrophone sensitivity. The MEMS piezoelectric hydrophone low noise amplifying circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor Capacitor C8, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resisto...

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Abstract

The invention discloses an echo amplification circuit of a low-noise MEMS piezoelectric hydrophone. The echo amplification circuit mainly comprises an non-inverting amplification circuit and a voltagefollower circuit. The circuit is powered by an accurate voltage source. A proper static potential is provided for the non-inverting amplification circuit by using the follower circuit through resistance voltage division; by selecting an operational amplifier with low equivalent input noise voltage and low equivalent input noise current and reasonably selecting an external resistor, the echo amplification circuit has a certain filtering effect, meanwhile, the equivalent input noise of the circuit is reduced, and the signal-to-noise ratio of the signal is further improved. The circuit is convenient to adjust the static working point of the amplification circuit, the circuit is simplified by means of power supply of a single power supply, good in circuit stability, few in used devices, low in cost, convenient to connect with an external circuit due to the fact that input and output share the same interface, convenient to operate and certain in application value.

Description

technical field [0001] The invention belongs to the field of electronic circuits, in particular to a low-noise MEMS piezoelectric hydrophone echo amplifying circuit. Background technique [0002] The ocean is a treasure house of resources and the key to the long-term development of human society. The exploration and development of the ocean, the detection and management of its resources all rely on the acquisition of ocean information. Hydrophones are mainly used to pick up and analyze underwater sound waves, which is of great significance to the exploration and mining of marine resources. At present, the traditional hydrophone has the advantage of high sensitivity and occupies the mainstream position in the market, but it has the disadvantages of high cost, large volume, and difficulty in forming an array to cover a large area of ​​sea area. With the development of technology, hydrophones with low power consumption, low cost and long battery life are required to be used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/68H03F1/26H03F1/30G01S7/52
CPCG01S7/52H03F1/26H03F1/30H03F3/68
Inventor 谢金杨邓飞杨磊陈旭颖
Owner ZHEJIANG UNIV
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