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An Inductorless Electrical-Balance 360° Phase Shifter for 0.5-1.15GHz in 0.18µm CMOS Host Publication: European Microwave Week Authors: B. Van Liempd, P. Wambacq and J. Craninckx Publisher: IEEE Publication Year: 2015 Number of Pages: 4
Abstract: This paper presents an integrated phase shifter based on electrical-balance operation. The phase shift of the circuit is set through the difference in impedance between two on chip tunable impedances. Each impedance consists of a parallel combination of a tunable resistor and a tunable capacitor. Measurements of the inductorless, 0.12mm2 prototype implemented in 0.18µm CMOS show a tunable range of >360° of phase shift across 0.5ǃ.15GHz with >12-bit tuning accuracy, while the 15 to 40dB insertion loss is acceptable for the target application of auxiliary self interference cancellation loops in in band full-duplex capable transceivers. The phase shifter has maximum phase/gain errors of 0.42° and 0.27dB per MHz, respectively.
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