Blood oxygen pulse acquisition system and blood oxygen pulse acquisition front integrated circuit

Abstract

The invention provides a blood oxygen pulse acquisition system and a blood oxygen pulse acquisition front integrated circuit. The blood oxygen pulse acquisition front integrated circuit comprises a receiving end circuit, a microprocessor and an emitting end circuit, wherein the receiving end circuit comprises a transimpedance amplifier and a low-pass filter, and the emitting end circuit comprises an LED driving circuit; the transimpedance amplifier receives current signals generated by a photosensitive diode through induction, amplifies the current signals, converts the current signals into voltage signals, and transmits the voltage signals to the low-pass filter; the low-pass filter, after filtering the voltage signals, sends the filtered voltage signals to the microprocessor; and the microprocessor, according to intensity values of the voltage signals, change currents of the LED driving circuit so as to control brightness of an LED connected with the LED driving circuit. According to the invention, the chip area can be reduced to a quite large extend, stable LED driving currents can be generated with few influences of temperature and process errors, and adjustment control of the currents is realized.

Description

technical field [0001] The present invention relates to health detection technology, in particular to a blood oxygen pulse acquisition system and an acquisition front-end integrated circuit. Background technique [0002] Blood oxygen saturation (PPG) is an important physiological parameter that reflects the health of the human body. Through the detection of blood oxygen saturation, it can effectively judge whether the function of the human circulatory system and respiratory system is normal. Nowadays, the non-invasive detection method has already become the mainstream, and the light-sensing blood oxygen saturation monitoring technology has become a relatively mature method. Because the pulsation of human arteries can cause changes in blood flow at the test site, resulting in changes in light absorption , the light absorption of non-blood tissue is generally considered to be constant. The light-sensing blood oxygen saturation measurement technology uses this feature to obtai...

AI Technical Summary

Problems solved by technology

Some world-renowned semiconductor chip companies, such as TI and AD, have mature solutions and routines. The front-end analog signal processing modules of the system are directly integrated into chips, which greatly facilitates the development of blood oxygen module hardware, but the static power consumption is too high (supply voltage >2V, supply current>500uA) is a key problem that needs to be solved urgently for the application of wearable devices, and large electronic components (capacitors, resistors) consume too much chip area

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