We present a novel generalization of quadrature oscillators (QVCO) which we call “arbitrary phase oscillator” or APO for short. In contrast to a QVCO which generates only quadrature phases, the APO is capable of continuously generating any desired phase at its output. The proposed structure employs a novel coupling mechanism to generate arbitrary phase shifts between two coupled oscillators without the need for an explicit phase shifter. A rigorous nonlinear dynamic analysis is presented to give a closed-form formula for the generated phase shifts, and the theory is verified by numerical simulation as well as measurement results of a prototype chip fabricated in 130-nm CMOS technology. The prototype APO has a frequency tuning range of 4.90–5.65 GHz and is continuously phase tunable from 0◦ to 360◦ across the entire frequency range. The APO structure can be used in designing novel coupled-oscillator-based phased arrays for 5G wireless communications.
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