Abstract:In order to improve the technical index of vector modulator and realize a better performance in the usage of RF interference cancellation, the technical scheme of digitalcontrol vector modulator is proposed in this paper. The stable and highprecision step control can be realized by using this proposed digitalcontrol vector. The testing results show that the developed vector modulator module has realized the stepprecision of less than 0.03 dB which has satisfied the system requirement.