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A circuit for duplicating the function of an incremental shaft encoder comprises a rugged resolver connected to a hybrid digital-analog circuit which generates output signals identical to those of a counterpart incremental encoder. The digital portion of the circuit includes terminals whereat absolu

A circuit for duplicating the function of an incremental shaft encoder comprises a rugged resolver connected to a hybrid digital-analog circuit which generates output signals identical to those of a counterpart incremental encoder. The digital portion of the circuit includes terminals whereat absolute angle measurements of a shaft may be made.

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A device for measuring shaft angle comprising: a shaft driven resolver having a stator input and a rotor output; reference signal generating means for generating a digital zero reference signal; reference signal converting means for converting a digital zero reference signal to a corresponding analo

A device for measuring shaft angle comprising: a shaft driven resolver having a stator input and a rotor output; reference signal generating means for generating a digital zero reference signal; reference signal converting means for converting a digital zero reference signal to a corresponding analog zero reference signal which is connected to the stator\s input resulting in a signal at the rotor output which is a sine waveform with a phase angle relative to the analog zero reference signal and equal to the mechanical angle of the resolver shaft; loop means having inputs connected to the digital zero reference signal generating means and the rotor output for tracking the phase angle of the resolver output and producing a digital angle signal corresponding thereto, wherein the reference signal converting means comprises: a first ROM storing a sine look-up table and connected at its input to the digital zero reference signal; first digital-to-analog converting means connected to the output of the first ROM for producing a first analog zero reference signal as a sine function; a second ROM storing a cosine look-up table and connected at its input to the digital zero reference signal; and second digital-to-analog converting means connected to the output of the second ROM for producing a second analog zero reference signal as a cosine function.