Quadrature modulator and calibration method

The invention claims a orthogonal modulator and a are added to the first detecting message of the modulator's cophasal modular power input end and is 90 degrees phase-shifts signals add to modulator's quadrature modulation branch to calibrate the first housing and method for selecting number of the orthogonal dimmer. An adjusting support radiating layer the signal output end of the measurement, according to measuring result of a DC offset voltage, so carrier leakage minimum. Switch and second detecting information of covered on the cophasal modular power input end and is 90 degrees phase-shifts switch signals to the second detecting message of the quadrature modular power input end. And the measurement to the upper side-band frequency element layer is the output signal without want, according to the measuring result for synchronizing and a gain of the local oscillator phase error quadrature modulation branch, so the sideband bars is no want.