Time domain bio-impedance detection circuit based on comparator

Abstract

The invention belongs to the technical field of integrated circuits, and particularly relates to a time domain bio-impedance detection circuit based on a comparator. The time domain bio-impedance detection circuit based on the comparator in the invention comprises a pseudo-sinusoidal current excitation generation circuit, an analog front-end amplification circuit, a PWM wave generation circuit andan impedance reconstruction circuit; bio-impedance to be detected is converted into a voltage signal through pseudo-sinusoidal current excitation; after the voltage signal is amplified by the analogfront-end amplification circuit, impedance information is converted into a time domain from a voltage domain by the PWM wave generation circuit; and finally, reconstruction is carried out by an impedance reconstruction algorithm. According to the time domain bio-impedance detection circuit based on the comparator in the invention, the requirements on a high-performance analog filter and a high-precision analog-to-digital converter are avoided; after information is converted into a time domain, signal conversion and processing are both achieved through a digital circuit; the advantages of the most advanced integrated circuit technology can be fully utilized; a high-performance signal processing circuit is achieved under relatively low power supply voltage; and system power consumption is further reduced. The time domain bio-impedance detection circuit based on the comparator in the invention has the characteristics of strong anti-interference capability, low power consumption and simplereconstruction algorithm.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a comparator-based time-domain biological impedance detection circuit. Background technique [0002] With the gradual deepening of the cooperation between the integrated circuit industry and medical and life science disciplines, multifunctional biological detection circuits are expected to appear in people's daily life in the future, changing the current form of medical care and realizing the daily life and autonomy of medical care, especially The development of implantable miniature biosignal detection system makes real-time monitoring and treatment of lesions possible. The biological impedance detection circuit is an integral part of it. At present, many studies have shown that bioimpedance testing can play a vital role in new drug development, cell structure research, and intraoperative and postoperative monitoring. The basic principle of bioimpedance...

AI Technical Summary

Problems solved by technology

However, this reconstruction algorithm needs to know the more accurate frequency of the excitation signal, so the above detection circuit has certain limitations on the way the excitation current is generated

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