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Position Calculation

Position Calculation is performed automatically inside CambridgeIC’s CTU chips. Resonant inductive position sensors use ratiometric calculations for immunity to resonator Q-factor, supply voltage and component variations.

The sensor coils of a Type 1 sensor are patterned to produce a SIN/COS variation of coupling factor with changes in position. The calculation of position (Pr in the figure below) is equivalent to the calculation of phase angle, and is performed with a 4-quadrant inverse tangent.
Type 1 sensor position calculation
Other sensor types use a similar underlying calculation.