1. Abidi, A. A.: Phase noise and jitter in CMOS ring oscillators. IEEE J. Solid-State Circ. 41, 1803–1816 (2006).
2. Yardeny, D., Kaplan, B. A., and Horen, Y.: New structures of four-phase oscillators obtained by strongly interweaving mono-phase limit-cycle oscillators. Int. J. Circ. Theor. Appl. 36, 409–419 (2008).
3. Narahara, K.: Multiphase oscillator using traveling pulses developed in a system of transmission lines with regularly spaced resonant-tunneling diodes. J. Infrared Millim. Terahertz Waves 38, 660–678 (2017).
4. Narahara, K., “Dynamics of traveling pulses developed in a tunnel diode oscillator ring for multiphase oscillation”, Nonlinear Dyn. 95, 2729–2743 (2019).
5. Black, W. C. and Hodges, D. A.: Time interleaved converter arrays, IEEE J. Solid-State Circ. 15, 1022–1029 (1980).