An Integrated Compact Phase Shifter With a Single Analog Control

This letter presents a new circuit topology for a vector sum phase shifter where the amplitudes and phases of
${I}$
and
$Q $
are simultaneously varied using a single analog control signal. The simultaneous adjustment of amplitudes and phases of
${I}$
and
${Q}$
allows for the vector sum’s large phase tuning while maintaining its amplitude. Moreover, various functions of vector summation are all performed in a single stage, minimizing the chip real estate and power consumption. The maximum range of analog phase tuning with a constant amplitude is theoretically 180°, but in practice, it is limited by the tuning range of the utilized varactors. To achieve a large phase tuning range given varactors with limited tunability, digital control has been added to allow for coarse tuning of the phase. The utilized approach for coarse phase tuning preserves the chip area and power consumption but causes amplitude variation. The phase shifter performance is verified by simulations and measurements.