Integrated weak electric signal filtering and amplifying circuit

A filter amplifier circuit and filter circuit technology, applied in the field of sensing technology and integrated circuits, can solve problems such as distortion, DC voltage imbalance, signal acquisition channel amplifier circuit saturation, etc.

Pending Publication Date: 2020-08-07
深圳芯森微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the electrochemical effect of the electrode, the electrode itself will introduce a DC voltage offset of up to several hundred mV, which is sufficient to cover the effective signal collected.
At the same time, because the acquisition object is in the micro-movement process, such as the contraction of breathing

Method used

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  • Integrated weak electric signal filtering and amplifying circuit
  • Integrated weak electric signal filtering and amplifying circuit
  • Integrated weak electric signal filtering and amplifying circuit

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Embodiment Construction

[0048] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] figure 1 It is a structural schematic diagram of an embodiment of the integrated weak electric signal filter amplifier circuit of the present invention;

[0050] Such as figure 1 As shown, the integrated weak electric signal filtering and amplifying circuit of the present invention includes: a coupling capacitor circuit 10, a first chopping switch circuit 20, an operational amplifier circuit 30, a second chopping switch circuit 40, a filter circuit 50, a first DC feedback circuit 60, second DC feedback circuit 70, first feedback capacitor array circuit 80, second feedback capacitor array circuit 90, wherein,

[0051] The input end of the coupling capacitance circuit 10 is connected with the positive electrode V...

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Abstract

The invention discloses an integrated weak electric signal filtering and amplifying circuit, which comprises a coupling capacitance circuit, a first chopping change-over switch circuit, an operationalamplifier circuit, a second chopping change-over switch circuit, a filtering circuit, a first direct current feedback circuit, a second direct current feedback circuit, a first feedback capacitor array circuit and a second feedback capacitor array circuit. The integrated weak electric signal filtering and amplifying circuit provided by the invention can effectively eliminate DC offset of electrodes without causing distortion of a target signal, can suppress motion artifacts to a certain extent, and has configurable high-pass cut-off frequency, adjustable magnification times and low circuit noise at the same time, thereby improving the integration level and precision of the whole signal acquisition system.

Description

technical field [0001] The invention relates to the fields of sensing technology and integrated circuit technology, in particular to an integrated weak electric signal filtering and amplifying circuit. Background technique [0002] In recent years, the rapid development of sensing technology has created favorable conditions for human beings to pay attention to their own physiological signals. Accurate collection of physiological signals such as ECG, EEG, EMG, and blood pressure provides effective information support for medical research and diagnosis, and promotes the development of modern medicine. In addition, the acquisition and analysis of EEG signals can also realize a series of brain control systems and products, which are widely used in military, aerospace, industrial and entertainment fields. [0003] Physiological signals such as ECG, EEG, and EMG are essentially weak bioelectrical signals. The amplitude of these signals is generally between tens of uV and several ...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F1/32H03F3/45
CPCH03F1/26H03F1/3205H03F1/3211H03F3/45264H03F3/45932
Inventor 张骏哲许小印
Owner 深圳芯森微电子有限公司
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