An integrated electro-physiological signal amplifier with an AC excitation function
An electrophysiological signal and AC excitation technology, which is applied in the fields of improving amplifiers to reduce noise influence, sensors, medical science, etc., can solve the problems of slow establishment time of physiological signal amplifiers and inability to monitor electrode impedance, and achieve the effect of reducing the establishment time
Active Publication Date: 2012-09-26
HANSHOW TECH CO LTD
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Problems solved by technology
[0005] The invention aims to solve the problem that the AC coupling structure integrated electrophysiological signal amplifier has a slow settling time and cannot effectively monitor the electrode impedance while collecting physiological signals normally
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[0060] According to a specific implementation manner, the capacitively coupled amplifier 1 can provide a voltage gain of not less than 40dB, and has a band-pass frequency characteristic, the low-frequency (high-pass) cut-off frequency of the pass-band can reach below 1 Hz, and the high-frequency (low-pass) The cut-off frequency can reach more than 10KHz, which is suitable for amplifying low-frequency dynamic physiological signals such as ECG, EEG, oculoelectricity, and myoelectricity;
[0061] The low-pass filter circuit 2 adopts a switched capacitor structure or a Gm-C structure, and its characteristic frequency is between 100 and 250 Hz, covering the main frequency components of low-frequency dynamic physiological signals such as ECG, EEG, oculoelectricity, and myoelectricity;
[0062] The band-pass filter circuit 3 adopts a switched capacitor structure or a Gm-C structure, and its characteristic frequency is 10 octaves higher than that of the low-pass filter circuit, between...
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The invention provides an integrated electro-physiological signal amplifier with an AC excitation function. The integrated electro-physiological signal amplifier comprises a capacitive coupling amplifier, a low pass filter circuit, a bandwidth filter circuit, an oscillation circuit, a quadrature excitation current generating circuit and an impedance analysis circuit, wherein the output terminal of the capacitive coupling amplifier is respectively connected with the input terminals of the low pass filter circuit and the bandwidth filter circuit; the capacitive coupling amplifier and an electro-physiological signal acquisition electrode are AC coupled through a capacitor; the oscillation circuit generates a sine voltage signal with an excitation frequency; the quadrature excitation current generating circuit converts the sine voltage signal to a dual-channel quadrature AC excitation current signal; and the impedance analysis circuit obtains the impedance of the electro-physiological signal acquisition electrode through analysis of comparing the output signals of the oscillation circuit and the bandwidth limited circuit. The integrated electro-physiological signal amplifier with AC excitation function can monitor the impendence characteristic of the electrode in a real-time manner, and can accurately determine the contact condition between the electrode and the skin.
Description
technical field [0001] The invention relates to an integrated physiological signal amplifier, in particular to an integrated electrocardiographic signal amplifier which has an AC excitation function and can monitor electrode impedance. Background technique [0002] With the continuous acceleration of social informatization and people's increasing emphasis on life and health, the development of medical instruments and biomedical equipment presents a trend of home use, miniaturization and miniaturization, and is used to amplify or collect ECG and EEG. ASICs for low-frequency dynamic physiological signals such as electro-oculogram, oculoelectricity, and myoelectricity have become one of the hot topics. [0003] At present, fully integrated physiological signal amplifiers realized by CMOS or BJT technology mostly adopt AC coupling structure, and usually set high-value capacitors as input coupling devices, and set transistors working in the sub-threshold region as high-value pseu...
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IPC IPC(8): H03F1/26A61B5/04
Inventor 许奇明张旭侯世国
Owner HANSHOW TECH CO LTD