Abstract
A novel coupling of a pair of identical two-contact (2C) magnetoresistors transformed into an in-plane sensitive Hall device is presented. The ohmic contacts are cross-linked, also adding a load resistor bridge, providing for constant current mode of operation and eliminating the inevitable parasitic offset. This silicon configuration, apart from its simplified layout, has linear and odd output voltage as a function of the magnetic field and current. The quadratic and even magnetoresistance in the two parts of this innovative device is completely compensated, which ensures high measurement accuracy alongside with identification of the magnetic field polarity. The experimental prototypes feature sensitivity of 110 V/AT. The mean lowest detected magnetic induction B at supply current of 3 mA over frequency range f ≤ 100 Hz at a signal-to-noise ratio equal to unity is Bmin ≈ 10 μT. Тhe high performance and the complete electrical, temperature and technological matching of the parts of this unusual Hall device make it very promising for many practical applications.
Highlights
The well-known 4C in-plane sensitive Hall devices (HD) are widely used in numerous configurations as universal sensors for practical application and last, but not least—to compensate the main disadvantage in differential output transducers—the offset, frequently through dynamic cancellation techniques
By switching the input and output electrodes of the Hall plate and summing-up algebraically the two obtained voltages, the offset can be significantly decreased [5,7,8]. These sensors, feature some drawbacks, such as: different values of the individual Hall potentials, generated on the two output terminals in a homogeneous magnetic field, output non-linearity, and offset. All these disadvantages result from the low inherent layout symmetry with asymmetry of the current lines with respect to the output terminals
The individual sensitivities on the two contacts C1 and C4 of the HD assessed by potentials VC1(B) and VC4(B), respectively, are equal, SRI ≈ 55 V/AT, Figure 2b
Summary
The well-known 4C in-plane sensitive Hall devices (HD) are widely used in numerous configurations as universal sensors for practical application and last, but not least—to compensate the main disadvantage in differential output transducers—the offset, frequently through dynamic cancellation techniques. By switching the input and output electrodes of the Hall plate and summing-up algebraically the two obtained voltages, the offset can be significantly decreased [5,7,8] These sensors, feature some drawbacks, such as: different values of the individual Hall potentials, generated on the two output terminals in a homogeneous magnetic field, output non-linearity, and offset. A novel in-plane symmetrical HD based on a two magnetoresistor structures overcoming the mentioned disadvantages is presented
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