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A low frequency fully differential gm-c filter applied to ecg signal acquisition

A signal acquisition, fully differential technology, applied in the field of microelectronics, can solve the problems of reducing the upper limit of the input common-mode voltage, unfavorable output common-mode voltage, etc., to achieve the effect of eliminating the common-mode voltage

Active Publication Date: 2020-11-17
XIDIAN UNIV
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Problems solved by technology

Because the output common-mode voltage of the transconductance unit is required to be equal to the input common-mode voltage in the overall circuit of the fully differential Gm-C filter, reducing the upper limit of the input common-mode voltage is extremely unfavorable for the adjustment of the output common-mode voltage

Method used

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  • A low frequency fully differential gm-c filter applied to ecg signal acquisition
  • A low frequency fully differential gm-c filter applied to ecg signal acquisition
  • A low frequency fully differential gm-c filter applied to ecg signal acquisition

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Embodiment 1

[0041] See figure 1 , figure 2 , image 3 , Figure 4 , figure 1 A schematic circuit diagram of a low-frequency fully differential Gm-C filter applied to ECG signal acquisition provided by an embodiment of the present invention; figure 2 A schematic circuit diagram of an integrating unit of a low-frequency fully differential Gm-C filter provided by an embodiment of the present invention; image 3 A schematic circuit diagram of a traditional source negative feedback circuit provided for an embodiment of the present invention; Figure 4 A schematic circuit diagram of a fully differential transconductance unit with an extremely low transconductance value provided by an embodiment of the present invention. An embodiment of the present invention provides a low-frequency fully differential Gm-C filter applied to ECG signals. The low-frequency fully differential Gm-C filter includes:

[0042] Transconductance unit, capacitor C1, capacitor C2, capacitor C3, capacitor C4, trans...

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Abstract

The invention relates to a low-frequency fully differential Gm-C filter applied to ECG signal acquisition. And the filter comprises a transconductance unit, a capacitor C1, a capacitor C2, a capacitorC3 and a capacitor C4, and the transconductance unit comprises a fully differential transconductance unit Gm1, a fully differential transconductance unit Gm2, a fully differential transconductance unit Gm3, a fully differential transconductance unit Gm4 and a fully differential transconductance unit Gm5. The improved source electrode negative feedback circuit is adopted, common-mode voltage on aresistor is effectively eliminated, the upper limit of input common-mode voltage is prevented from being reduced, and it is convenient to achieve that the output common-mode voltage is equal to the input common-mode voltage; The pseudo full-differential circuit based on the series-parallel current mirror is adopted, and a common-mode feedback circuit of a traditional full-differential circuit is prevented from being used for determining the output common-mode voltage, so that the complexity of circuit design is reduced, and the power consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and in particular relates to a low-frequency fully differential Gm-C filter applied to ECG signal collection. Background technique [0002] In recent years, with the rapid development of microelectronic technology, many new technologies have emerged to collect and process electrocardiogram (ECG, Electrocardiograph) signals. ECG is one of the important bioelectric information of the human body. ECG signal is an electrical biosignal generated by cardiac muscle contraction. It is a weak analog signal, and the voltage amplitude is generally on the order of several mV. [0003] Usually, the collected ECG signal will be coupled with a large amount of noise and interference signals. Therefore, the current ECG signal collection system needs to filter the small-amplitude ECG signal amplified by the preamplifier. Because of the low frequency of the ECG signal, it is difficult to integrate the lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H11/04
Inventor 刘帘曦贺磊张怡华天源朱樟明
Owner XIDIAN UNIV
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