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A low-noise mems piezoelectric hydrophone echo amplifier circuit

A technology of amplifying circuit and hydrophone, which is applied in improving amplifier to reduce temperature/power supply voltage variation, amplifier combination, radio wave measurement system, etc. , the effect of good circuit stability

Active Publication Date: 2021-08-24
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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  • A low-noise mems piezoelectric hydrophone echo amplifier circuit
  • A low-noise mems piezoelectric hydrophone echo amplifier circuit
  • A low-noise mems piezoelectric hydrophone echo amplifier circuit

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Embodiment Construction

[0018] The present invention will be further elaborated and described below with reference to the accompanying drawings and specific embodiments.

[0019] attached figure 1 It is a schematic diagram of a low-noise amplifying circuit of a MEMS piezoelectric hydrophone provided by an embodiment of the present invention. This echo amplifier circuit is used in MEMS piezoelectric hydrophones. The hydrophone chip has low receiving sensitivity at low frequency. Therefore, 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 amplifier 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 resistor R5, sixth ...

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PUM

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Abstract

The invention discloses an echo amplifying circuit of a low-noise MEMS piezoelectric hydrophone. The echo amplifying circuit mainly includes a non-inverting amplifying circuit and a voltage following circuit. The circuit is powered by a precise voltage source, and the follower circuit provides a suitable static potential for the non-inverting amplifying circuit through resistor division. By selecting an operational amplifier with low equivalent input noise voltage and low equivalent input noise current and conducting external resistance Reasonable selection enables the echo amplifier circuit to have a certain filtering effect while reducing the equivalent input noise of the circuit and further improving the signal-to-noise ratio of the signal. The circuit is convenient to adjust the static operating point of the amplifying circuit, the single power supply simplifies the circuit, the circuit has good stability, uses few components, and is low in cost.

Description

technical field [0001] The invention belongs to the field of electronic circuits, in particular to a low-noise MEMS piezoelectric hydrophone echo amplifier 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 and the detection and management of its resources all depend on the acquisition of ocean information. Hydrophones are mainly used to pick up and analyze underwater sound waves, which are 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 it is difficult to form an array situation 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 re...

Claims

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Application Information

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Patent Type & Authority Patents(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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