Active vector modulator

The invention discloses an active vector modulator. One specific implementation mode of the active vector modulator comprises an input transformer balun, an on-chip differential quadrature coupler, anI-path variable gain amplifier, a Q-path variable gain amplifier, a digital-to-analog converter and an output transformer balun, the input end of the input transformer balun receives a radio frequency input signal, and the output end of the input transformer balun is connected with the input end of the on-chip differential quadrature coupler; the input end of the I-path variable gain amplifier isconnected with the differential output end of the on-chip differential quadrature coupler, and the output end of the I-path variable gain amplifier is connected with the output end of the Q-path variable gain amplifier and the input end of the output transformer balun. The input end of the Q-path variable gain amplifier is connected with the differential coupling end of the on-chip differential quadrature coupler; the out