Phase-sensitive transducer apparatus

In a phase-sensitive transducer apparatus comprising first and second relatively movable members, said first relatively movable member having a plurality of windings and said second relatively movable member having a winding;

• and means for applying a first input signal to one of the windings of said first relatively movable member and a second input signal to another of the windings of said first relatively movable member, an output signal being developed on the winding of said second relatively movable member, said first and second input signals being sinusoidal in nature of substantially identical frequency and peak amplitude and being phase-displaced by a predetermined amount, and said output signal being substantially constant in peak amplitude and variable in phase during relative movement of said first and second relatively movable members, the improvement comprised in that said means for applying comprises:
• clock means for generating a clock signal at a clock frequency;
• means coupled to said clock means and responsive to said clock signal for generating a plurality of mutually phase-displaced square-wave signals of substantially identical frequency and peak amplitude;
• means coupled to said means for generating and responsive to a first group of said plurality of square-wave signals for deriving said first input signal and responsive to a second group of said plurality of square-wave signals different than said first group for deriving said second input signal;
• and
• means for respectively coupling said first and second input signals to said one and said other windings of said first relatively movable member.