The invention belongs to a bias matcher matched with a
quadrature modulator, which comprises a blocking circuit, an
alternating current (AC) matching interface circuit, a
direct current (DC) bias circuit, two pairs of differential AC
voltage input ports and two pairs of corresponding output ports. As a
voltage division circuit shared by
DC bias unit circuits is arranged between a DC power supply and a grounding end, and all blocking capacitors are re-arranged at the input ends of
AC power supplies of the corresponding bias matching circuits, a grounding
resistor in the
voltage division circuit no longer has the function of a biasing
resistor, while a corresponding AC matching
resistor has the function of the biasing resistor respectively. Therefore, the bias matcher matched with the
quadrature modulator is characterized in that: the circuit structure and the production process are simple, the requirement on performance consistency of the elements such as the resistor, the
capacitor and the like is low, the consistency of performance parameters between the bias matching unit circuits and the matching between the quadrature modulators are high, the anti-interference capability of a
signal is effectively improved, the spectrum
distortion of the
signal is inhibited; and the bias matcher can be industrially produced on a large scale, the production efficiency is high and the cost is low.