Electrocardiosignal detection chip for wearable device

Abstract

The invention provides an electrocardiosignal detection chip for a wearable device. The scheme is as follows: a pre-amplifier receives electrocardiosignals collected by an electrocardiograph detection electrode and input from two ends, amplifies the electrocardiosignals for generating primary amplified signals, and transmitting the primary amplified signals to a post-amplifier; the post-amplifier converts the primary amplified signals to single-ended signals, amplifies the single-ended signals for generating secondary amplified signals, and transmits the secondary amplified signals to an RC high-pass filter; the RC high-pass filter carries out high-pass filtering treatment on the secondary amplified signals to generate high-pass secondary amplified signals, and transmits the high-pass secondary amplified signals to a second-order Gm-C low-pass filter; the second-order Gm-C low-pass filter carries out low-pass filtering treatment on the high-pass secondary amplified signals for generating band-pass filtering signals, and transmits the band-pass filtering signals to a buffer for realizing buffer temporary storage and output; a power management module is used for providing power voltage and reference voltage.

Description

technical field [0001] The present invention relates to an electrocardiographic signal detection technology, in particular to an electrocardiographic signal detection chip used in a wearable device. Background technique [0002] The electrocardiogram (ECG) records the electrical activity of the heart and provides key information for the research and diagnosis of cardiovascular diseases. In the early monitoring of heart disease, it is difficult to capture effective diagnostic basis in an ECG. The dynamic electrocardiogram (DCG) can continuously record the whole process of cardiac electrical activity for 24 hours, and can detect arrhythmia and myocardial ischemia that are difficult to detect in a conventional ECG. Symptoms are an important objective basis for clinical analysis of conditions, establishment of diagnosis, and judgment of curative effect. DCG can realize long-term real-time monitoring of patients' health status and long-term real-time detection. Traditional ECG d...

AI Technical Summary

Problems solved by technology

At present, ECG acquisition chips on the market are mainly concentrated in foreign companies, such as TI, ADI and Neurosky, but excessive power consumption (supply voltage > 2V, supply current > 100uA) is a key problem that needs to be solved urgently for the application of wearable devices. And large electronic components (capacitors, resistors) will consume too much chip area

Although there is a fully integrated commercial single-channel ECG acquisition chip reported in China, the chip consumes too much power (150uA), and the low-pass filter in the circuit structure adopts the traditional Gm-C structure, which requires a large filter capacitor , occupying too much chip area, and the input impedance (100MΩ) cannot meet the requirements for the use of dry electrodes

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