| CPC G01D 5/20 (2013.01) [G01B 7/30 (2013.01)] | 17 Claims |
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1. An inductive sensor interface circuit comprising:
a coil driver configured to excite one or more transmit coils to generate a magnetic field at a target;
a plurality of input channels for receiving input signals via respective ones of a plurality of receive coils, the input signals responsive to reflections of the magnetic field off the target and encoding information about a position of the target, the plurality of input channels including at least:
a first input channel for receiving a first input signal, and
a second input channel for receiving a second input signal out of phase with the first input signal;
a position detection processor to decode the information about the position of the target from the input signals based on a direction of a vector representing an amplitude of the first input signal and an amplitude of the second input signal; and
an amplitude detection processor configured to calculate an amplitude of the input signals based on a magnitude of the vector, and to generate a coil driver control signal which is fed back to coil driver to control a strength of the magnetic field generated by the coil driver, the generated coil driver control signal having a level determined at least in part based on a difference between the calculated amplitude to a predetermined desired input amplitude.
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