A Single-channel Acquisition Amplifier for Multiple Physiological Parameter Signals
A technology of physiological parameters and amplifiers, applied in the direction of sensors, medical science, diagnosis, etc., can solve the problem of less research on detection circuits, and achieve the effect of long-term dynamic monitoring, low cost and simple structure
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Embodiment 1
[0035] Multiple Physiological Parameter Single Channel Acquisition Amplifier, see figure 1 , the acquisition amplifier includes: excitation signal 1, impedance detection and shaping signal superposition circuit 2, common mode drive circuit 3, parallel differential amplifier circuit 4, high-pass low-pass circuit 5, over-sampling and fast digital phase-locking circuit 6.
[0036] Among them, the excitation signal 1 is two high-frequency square wave excitation signals with the same frequency and opposite phases.
[0037] Impedance detection and shaping signal superimposition circuit 2 is to utilize the reasonable disposition of resistance and capacitance (the selection method of specific capacitance and resistance value refers to embodiment 3), makes its input impedance can satisfy relevant standard when detecting electrocardiogram signal, detects breath for impedance method When the respiratory impedance modulus is lowered by the corresponding multiple, it solves the problem of ...
Embodiment 2
[0045] The physiological parameter signal single-channel acquisition amplifier in Embodiment 1 is further described in combination with specific device models, see the following for details:
[0046] In the embodiment of the present invention, the microprocessor used is STM32F103RET6; the analog-to-digital converter ADC is 12bit, and the sampling rate is 200Ksps.
[0047] Among them, the detection principle of the respiratory signal is as follows: image 3 As shown, U in the figure S Denoted as the excitation signal, Z S Expressed as the external impedance when the excitation terminal is connected in series with the human body, U ecg Expressed as an ECG signal (the main part of the detected human body signal is the central electrical signal), Z d Expressed as contact resistance and various resistances of the human body, Z r Expressed as the resistance of the thoracic impedance as it varies with respiration. Then there are:
[0048]
[0049] because Z S much larger th...
Embodiment 3
[0060] The basic principle of multi-physiological parameter signal single-channel acquisition amplifier is described as follows, see figure 2 As shown in the schematic diagram, first of all, the core of this method lies in the reasonable configuration of resistors and capacitors, using the different modulus values of impedance at different frequencies to balance the problem of impedance and gain when detecting ECG and respiratory signals at the same time. The embodiment of the present invention is described by using a microprocessor to generate two high-frequency square wave voltage excitation signals as an example to realize fast digital phase-locked demodulation, and the first and second signals are respectively an ECG signal and a respiration signal.
[0061] The microprocessor generates two high-frequency square-wave voltage excitation signals with the same frequency and opposite phases, which are respectively denoted as U S1 and U S2 ;
[0062] Among them, the voltag...
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