Analog front-end circuit for ECG (Electrocardiograph) signal detection chip

Abstract

The invention relates to the field of design of a CMOS analog integrated circuit and particularly relates to an analog front-end circuit for an ECG (Electrocardiograph) signal detection chip. The invention discloses the analog front-end circuit for the ECG signal detection chip, which comprises a totally-integrated high-pass capacitance amplifier and a Sigma-Delta modulator. The capacitance amplifier is used for filtering out a direct current voltage component in an electrocardiosignal by utilizing a high-pass access formed by a feedback resistor and a feedback capacitor and carrying out amplification on an ECG voltage signal by a full differential structure formed by a full differential transconductance amplifier; and the Sigma-Delta modulator converts the amplified ECG voltage signal into a digital code, and outputs the digital code to a digital signal processing platform to carry out processing. The analog front-end circuit is high in integration, low in power consumption and high in detection accuracy.

Description

technical field [0001] The invention belongs to the field of CMOS analog integrated circuit design, and in particular relates to an analog front-end circuit for an electrocardiographic signal detection chip. Background technique [0002] With the continuous improvement of people's awareness of their own health status monitoring and disease prevention, wearable ECG detection equipment has received more and more attention and development. As the first-level circuit and an important part of the detection chip, the power consumption, noise, signal-to-noise ratio and other performances of the analog front-end circuit directly determine the working time and detection accuracy of the system, so the analog front-end has also become an industry and academia research hotspot. [0003] The frequency range of the electrocardiographic signal is usually around the range of 0 to 500 Hz, and the signal amplitude is between 100 μV to 5 mV. To extract weak signals from background noise, the...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the existing analog front-ends for ECG detection use DC blocking capacitors to filter out the DC components in the ECG signal. It also adopts a single-ended output structure, which limits the dynamic range of the output signal; in addition, in order to reduce the power consumption of the circuit, a successive approximation analog-to-digital converter is used for analog-to-digital conversion, which cannot achieve a signal-to-noise ratio output of more than 10bit, and increases the digital signal. Processing difficulty of the processing platform

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