Novel principle for vector modulator-based phase shifters operating with only one control voltage

In this paper, a novel principle for vector modulator-based phase shifters is proposed, which enables continuously adjustable phase control with only one control voltage. The weighting of the vector paths is performed by a simple configuration of DC-coupled variable attenuators. A compact low-power-consuming L-band microwave monolithic integrated circuit based on a commercial gallium-arsenide metal semiconductor field-effect transistor process is presented to verify the principle. Within a phase-control range higher than 120/spl deg/, a gain of 1.6/spl plusmn/0.6 dB is measured at 825 MHz. The current consumption is 5 mA at a supply voltage of 1.8 V. To the knowledge of the authors, this is the first vector modulator-based phase shifter which requires only one control bias, thereby significantly decreasing the control complexity.