REFERENCE SIGNAL GENERATION CIRCUIT, ANGLE CONVERTER, AND ANGLE DETECTION APPARATUS

摘要

A reference signal generation circuit generates a reference signal used in synchronous detection for removing an excitation signal component in an angle calculation section that converts a detection angle .theta. obtained from two-phase resolver detection signals output from a resolver, to a digital output angle .PHI.. The reference signal generation circuit includes a first multiplier, a second multiplier, and an adder. The first multiplier multipli es one of the resolver detection signals sin.theta.sin(.omega.t+.about..omega.) by the sine value sin.PHI. of the digital output angle .PHI. obtained from the angle calculation sectio n. The second multiplier multiplies the other resolver detection signal cos.theta.sin(.omega.t+.about..omega.) by the cosine value cos.PHI. of the digital output angle .PHI. obtained from the angle calculation section. The adder adds the output of the first multiplier and the output of the second multiplier to output the s um signal sin(.omega.t+.about..omega.) as the reference signal.