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This paper presents the design of two wideband LC-VCOs dedicated to LTE/LTE-A standards. The first oscillator employs an improved MIM + NMOS-switch varactors to achieve wideband frequency tuning. The second oscillator employs in addition an “8-shaped” inductor to reduce the electromagnetic (EM) interactions involving the oscillator and a dual-Gm start-up boost technique to compensate the losses increase...
This paper presents a compact analytic expression for the oscillation amplitude in source-tailed MOS LC-VCOs versus the oscillator bias current and LC-tank resistive losses. The developed equation is based on the use of analog saturation functions to provide a continuous analysis among the oscillator's current-limited and voltage-limited regimes, which takes also into account the oscillation start-up...
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