A 4-bit SiGe passive phase shifter for X-band phased arrays
Kalyoncu, İlker and Özeren, Emre and Kaynak, Mehmet and Gürbüz, Yaşar (2013) A 4-bit SiGe passive phase shifter for X-band phased arrays. In: IEEE 13th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF 2013), Austin, TX
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Official URL: http://dx.doi.org/10.1109/SiRF.2013.6489482
This paper presents a 4-bit passive phase shifter for X-band (8-12 GHz) phased-arrays, implemented in 0.25-mu m SiGe BiCMOS process. All bits are digitally controlled. The 22.5 degrees and 45 degrees bits are based on switched low-pass network while the 90 degrees and 180 degrees bits are based on switching between high-pass/low-pass filters. Filters are implemented using on-chip spiral inductors and high-Q MIM capacitors. Switching functionality is obtained by isolated NMOS transistors employing resistive body floating technique. All bits are optimized to minimize the RMS phase error. Ordering of bits is optimized so as to minimize the overall insertion loss. Simulated insertion loss is 12+/-2 dB and RMS phase error is less than 2 degrees over X-band frequencies.
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