| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent defect in feedback control, even if there is deviation in the input signal, and to satisfy predetermined quadrature error compensating characteristics, using a simple circuit. <P>SOLUTION: The circuit is provided with a sum of squares calculating means for calculating sum of squares of an in-phase signal and a quadrature signal to be output from a quadrature error compensating means; a code inverting means for applying code inversion on an output of the square sum calculating means; a selecting means for outputting a first input, when a third input is the same code and outputting a second input when it is a different code, where the first input is the output of the square sum calculating means, the second input is the output of the code-inverting means, a third input is code information of the output of the quadrature error compensating means; an accumulative processing means for accumulating the output of the selecting means, stopping the accumulating adding processing, if the absolute value thereof exceeds the absolute value of the threshold, and outputting an addition signal/subtraction signal according to positive/negative state of an accumulated addition value; and an accumulator for outputting a value, increased by increment according to the addition signal/subtraction signal as a control signal to the quadrature error compensating means. <P>COPYRIGHT: (C)2007,JPO&INPIT |
