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Pressure sensor with filter and amplification circuit

2017-02-25 21:06  
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MAX4471 is amplifier.MAX9028 is the MAXIM company's low power comparator.Filter circuit uses band-pass filter composed of MAX267(allowing 0.8 ~ 38Hz signal through),filters out the DC component of the signal,power,the high-frequency noise and frequency interference of the skin with the cuff friction,then further amplifies through the MAX4471,gets the matching chip voltage signal into the ADC2,monitors the AC component of blood pressure.While the signal is converted into pulse signals through a low-power comparator MAX9028 to trigger ADC1 work.