Quick acquiring method for multi-frequency-point bioelectrical impedance
A bioelectrical impedance and acquisition method technology, which is applied in medical science, sensors, diagnostic recording/measurement, etc., can solve the problems of unsatisfactory autocorrelation, increase the amount of calculation and complexity of the system, and take a long time to improve anti-interference energy, reduce design difficulty, and reduce the effect of computation
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[0019] like figure 1 , figure 2 As shown, a method for quickly acquiring multi-frequency point bioelectrical impedance, constructing a multi-channel direct frequency synthesizer DDS on an FPGA, and synthesizing the single-frequency signals output by the multi-channel direct frequency synthesizer DDS into multi-frequency points through an adder circuit Composite excitation source V in , using an automatic balancing bridge to combine the multi-frequency point composite excitation source V in Simultaneously loaded to the reference resistor R ref and the electrical impedance Z of the organism to be measured x , and then use a dual-channel synchronous analog-to-digital conversion chip to convert the reference resistor R ref The voltage on V ref , the electrical impedance Z of the organism to be measured x The voltage on V x converted into a digital signal;
[0020] Select the reference resistor R ref The voltage on V ref and the electrical impedance Z of the organism to ...
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