Patent ID: 8665989
Filing Date: 2014-03-04
Classification: H04B,Y02D

Abstract:
1. A phase shifter that adds phase information to two baseband signals to be output to an orthogonal modulator so as to control a phase of an output signal of the orthogonal modulator, the phase shifter comprising: a 90° step phase shifter that contributes to adding any one of phases 0°, 90°, 180°, and 270° to the baseband signals according to a first control signal; and a 45° phase shifter that contributes to adding one of phases 0° and 45° to the baseband signals according to a second control signal, wherein the phase shifter performs replacement of component signals of one of the baseband signals with component signals of the other of the baseband signals and inversion of polarities of the component signals, and wherein the phase shifter outputs the baseband signals including the phase information to the orthogonal modulator modulating a local signal according to the baseband signals including the phase information.