A 6-bit vector-sum phase shifter with a decoder based control circuit for x-band phased-arrays
Çetindoğan, Barbaros and Özeren, Emre and Üstündağ, Berktuğ and Kaynak, Mehmet and Gürbüz, Yaşar (2015) A 6-bit vector-sum phase shifter with a decoder based control circuit for x-band phased-arrays. (Accepted/In Press)
Official URL: http://dx.doi.org/10.1109/LMWC.2015.2505618
This letter presents a 6-bit vector-sum phase shifter with a novel control circuitry for X-band phased-arrays using a 0.25-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 <2.8 between 9.6-11.7 GHz and <5.6 between 8.2-12 GHz, achieving 6-bit phase resolution. The chip size is 1.870.88 mm2, 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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