Patent ID: 7098653

Claim:
A system for sensing a rotational angle of an object relative to a predetermined position, said system comprising: a transducer configured to sense said rotational angle of said object and to provide a first input signal and a second input signal based on said rotational angle; a rotational angle determining circuit for determining said rotational angle from said first input signal and said second input signal, said rotational angle determining circuit comprising: an input circuit configured to receive said first input signal and said second input signal and to provide a third signal, said input circuit comprising a first multiplier circuit configured to receive said first input signal and a first sinusoidal signal and provide a first multiplier output signal, a second multiplier circuit configured to receive said second input signal and a second sinusoidal signal and provide a second multiplier output signal, and an adder circuit configured to sum said first output multiplier signal and said second output multiplier signal and to provide said third signal, said third signal being a sum of said first output multiplier signal and said second output multiplier signal; and an output circuit configured to receive said third signal and to provide an output signal representative of a phase angle, said output circuit comprising a phase modulator circuit configured to provide an output square wave signal having a width based on said phase angle.