Published:2011/7/10 2:28:00 Author:leo | Keyword: Low humidity, Detecting circuit | From:SeekIC
Picture 1 shows a circuit that uses the feature of low humidity of CGSH humicap to test other circuit. This circuit can even test other circuits with high accuracy under the atmosphere with less than 10% humidity. Operation amplifier A1, A2 and A3 are front amplifying circuit and difference amplifying circuit. The output signals of A1 pass through analog switch B1 and be alternately sent to A2 and A3 in order to eliminate the influence of change of temperature and the frequency noise and test steadily the output signals of sensor. A4,A5 and A6 are linear regulating circuit of sensor CGS-H and compensate the temperature by using the thermistor RL.
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