Methods and apparatus for positioning a coil motor

摘要

Methods and apparatus for providing a position sensor to sense the position of a ferromagnetic target and generate a target position signal, a scaling block to receive the target position signal, and a digital RC filter to generate an output using bit shifting for dividing by some factor of two, wherein all division for computations in the RC filter are performed by bit shifts.

主权项

1. An integrated circuit, comprising:
a position sensor to sense the position of a ferromagnetic target and generate a target position signal; a scaling block to receive the target position signal; a digital RC filter to receive the target position signal, a reference position, and a scale factor, and generate an output, the RC filter including:
a multiplier to multiply the scale factor and a difference of the reference position and the target position signal; anda bit shifter for dividing by some factor of two, wherein all division for computations in the RC filter are performed by bit shifts; a PID controller coupled to the RC filter to receive the output from the RC filter; and an output driver to provide a position output signal.