Abstract
This letter presents a 6 bit vector-sum phase shifter with a novel control circuitry for X-band phased-arrays using a 0.25 $\mu$ m SiGe BiCMOS technology. A balanced active balun and highly accurate I/Q network are employed to generate the reference in-phase and quadrature vectors. The desired phase is synthesized by modulating and summing the generated reference vectors using current steering VGAs that are controlled by a decoder based control circuit. The phase shifter resulted in a measured RMS phase error ${ between 9.6–11.7 GHz and ${ between 8.2–12 GHz, achieving 6 bit phase resolution. The chip size is 1.87 $\,\times\,$ 0.88 mm $^2$ , excluding pads. To the best of authors' knowledge, this is the first demonstration of a digitally controlled 6 bit vector-sum phase shifter for X-band.
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