A differential test circuit made by analog switch

Published:2011/7/13 19:55:00 Author:leo | Keyword: Test circuit, Analog switch | From:SeekIC

What the picture shows is a differential test circuit made by analog switch. In the circuit, sensor uses hall component H. When magnetic field is imposed vertically on hall component H, the control current value between a and b is l1, then the hall voltage produced is KBI1 plus UB. In this formula UH=KBI1+UB, k is the proportionality constant, UB is unbalanced voltage. In order to clear this unbalanced voltage, we can make the average of the control current I1 of this hall component equal to zero. We can do this by using switch s10 and s20 to convert the control current I1 alternately to make the amplitude of vibration equal to the time at the moment. At the same time, to make the hall component have a steady sensibility, we only need to make the control current I1 steady. Control current is decided by Ur and Rs, that is I1=Ur/Rs.



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