Hall element compensation circuit

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Hall element unequal potential compensation unequal potential has the same order of magnitude as Hall potential, and sometimes even exceeds Hall potential. ADUM1201ARZ is extremely difficult to eliminate unequal potential in practical applications, so compensation must be used. . Since the unequal potential is consistent with the unequal resistance, a method of analyzing the resistance can be used to find a compensation method for the unequal potential. As shown in the figure, A and B are excitation electrodes, C and D are Hall electrodes, and the pole distribution resistances are represented by R _i , R ₂ , R ₃ and R4, respectively. Ideally, R _i =R ₂ =R ₃ =R ₄ , and zero current is zero (or zero resistance is zero). In fact, due to the existence of the unequal resistance, the four resistor values ​​are not equal, and can be regarded as the four bridge arms of the bridge, and the bridge is unbalanced. To achieve equilibrium, resistors can be placed in parallel on the bridge arm with a large resistance (see Figure a) or on both bridge arms (see Figure b).