Front-end amplifier circuit based on magnetoelectric transducer made of relaxor ferroelectric material

A front-end amplifier, magnetoelectric sensor technology, applied to amplifiers with multiple amplifying elements, etc., to suppress strong power frequency interference and improve signal-to-noise ratio

Inactive Publication Date: 2010-08-18
NANTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Issues such as device preamplifier circuit design, thermal noise and vibration noise control
In addition, the sensor signal is a weak high-impedance signal source, and there are a lot of 50Hz electromagnetic wave interference in the external environment, which makes it easy for the sensor to introduce 50Hz interference signals to the system

Method used

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  • Front-end amplifier circuit based on magnetoelectric transducer made of relaxor ferroelectric material
  • Front-end amplifier circuit based on magnetoelectric transducer made of relaxor ferroelectric material
  • Front-end amplifier circuit based on magnetoelectric transducer made of relaxor ferroelectric material

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with drawings and embodiments.

[0019] Typically, high output impedance can be achieved using a traditional cascode current mirror structure. However, the output of this structure will lose at least one threshold voltage during normal operation, which directly reduces the voltage output swing. This is mainly because the cascode current mirror structure uses a diode-connected bias circuit, which makes the drain-source voltage of each tube not the minimum voltage required to maintain a saturated state.

[0020] figure 1 It is a traditional cascode current mirror structure circuit. make K = 1 2 μ n C vx , Then we can introduce M b2 The gate voltage of

[0021]

[0022] So the condition for the current mirror to work properly is

[0023]

[0024] From this we can see tha...

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Abstract

The invention relates to a high-CMRR front-end amplifier unit circuit module with a magnetoelectric transducer made of a relaxor ferroelectric material, which can amplify a magnetoelectric signal and inhibit jamming from 50 Hz power frequency. The invention is characterized in that the output voltage signal of the magnetoelectric transducer made of relaxor ferroelectric material is initially amplified by the front-end amplifier, and the 50 Hz strong power frequency jamming is inhibited by utilizing the high CMRR feature of the front-end amplifier, thereby amplifying the differential small-signal and inhibiting the common-mode large-signal. The circuit modules are integrated on an integrated circuit chip; and after being connected with a detector, the integrated circuit chip can effectively read the signal of the relaxor ferroelectric detector.

Description

technical field [0001] The invention relates to a high CMRR front-end amplifier unit circuit module of a relaxation ferroelectric material magnetoelectric sensor. Background technique [0002] At present, the magnetoelectric sensors used in industry are mainly magnetosensitive coils and Hall sensors. The magnetic sensitive coil is a passive flux sensor, which is greatly affected by frequency and is mainly suitable for detection in medium and high frequencies. However, its electrical output is very large at high frequencies, which often causes damage to the front-end receiving equipment. The Hall sensor is a kind of active field sensor, its sensitivity is relatively poor, and at the same time, it needs temperature compensation during use, which is costly and consumes energy. The new magnetoelectric sensor based on relaxor ferroelectric materials has passive detection, no energy consumption, low cost, small size, good linearity, high detection accuracy and sensitivity, wide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/42
Inventor 丁俊民陈帅景为平顾勇鲁华祥李言谨
Owner NANTONG UNIVERSITY
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