This paper presents a 6-bit active phase shifter using a new vector-sum method for X-band (8–12 GHz) phased arrays in 0.13 μm SiGe BiCMOS process. An RC filter is used to generate two orthogonal vectors which are then fed into four VGAs, two using the common-base and two using the common-emitter topology. This generates 4 vectors of 0°, 90°, 180° and 270° which are scaled and added by varying the gains of the VGAs to generate any phase between 0–360°. The gains of the VGAs are adjusted with analog voltage control using the current-steering method. The outputs of the VGAs are connected together with a common load in order to add the vectors in current-domain. The phase shifter achieves < 5.6° RMS phase error over 8–12 GHz and < 3.1° RMS phase error over 9–11 GHz. The phase shifter has a power consumption of 16.6 mW from a 2V supply. The chip size is 850 μm × 532 μm including the probing pads. These performance parameters are comparable with the state of the art of the technology in literature.