Z-Z ChenTAI-CHENG LEE2018-09-102018-09-102011-01http://scholars.lib.ntu.edu.tw/handle/123456789/366773https://www.scopus.com/inward/record.uri?eid=2-s2.0-79955624362&doi=10.1109%2fTCSII.2011.2124650&partnerID=40&md5=afadd0c8e802bc3b6350dce7f7effaaaAn analytical investigation of a dual-mode ring oscillator is presented. The ring oscillator is designed using a CMOS 0.18-μm technology with differential eight-stage delay cells employing auxiliary input devices. With a proper startup control, the oscillator operates in two different modes covering two different frequency bands. A nonlinear model, along with the linearization method, is used to obtain the transient and steady-state behaviors of the dual-mode ring oscillator. The analytical derivations are verified through HSPICE simulation. The oscillator operates at the frequency bands from 25 GHz and from 0.12 GHz, respectively.Fractional-N frequency synthesizer (FNFS); multiphase signals; ring oscillators; voltage-control oscillators (VCOs)[SDGs]SDG7Electrical engineering; Electronics engineering; Analytical investigations; Different frequency; Fractional-N frequency synthesizers; Linearization methods; Multiphase signals; Ring oscillator; Steady-state behaviors; Voltage control oscillators; SPICEjournal article10.1109/TCSII.2011.21246502-s2.0-79955624362WOS:000289899800005