QUADRATURE MODULATOR AND QUADRATURE DEGREE CORRECTION DEVICE FOR QUADRATURE MODULATOR

摘要

PURPOSE: To accurately correct a quadrature degree by providing a quadrature degree error information computing means and a quadrature degree correction means, using quadrature degree error information and correcting the quadrature degree. ;CONSTITUTION: Two mutually orthogonally crossing carrier wave signals obtained by passing signals from a carrier wave oscillator 1 through a 90° hybrid circuit 2 are used, frequency conversion is conducted to two mutually orthogonally crossing quadrature amplitude signals I and Q and quadrature modulation is performed. At the time, in the quadrature degree error information computing means 6, the quadrature degree error information is obtained based on the two carrier wave signals from the 90° hybrid circuit 2. Further, in the quadrature degree correction means 7, the quadrature degree error information from the quadrature degree error information computing means 6 is used, the carrier wave signals or the quadrature amplitude signals are corrected and the quadrature degree is corrected. The quadrature degree correction means 7 is constituted as a phase correction means for instance and the phase correction is conducted to one of the carrier wave signals from the 90° hybrid circuit 2.;COPYRIGHT: (C)1995,JPO