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Integrated 22 GHz low-phase-noise VCO with digital tuning in SiGe BiCMOS technology

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5 Author(s)

A fully integrated voltage-controlled oscillator (VCO) with a 17% tuning range and a low phase noise fabricated in a 0.25 mum SiGe BiCMOS technology is presented. To achieve a wide tuning range while keeping a low gain (KVCO), the VCO has 16 bands selectable by a 4-bit digital control. Coarse tuning is achieved using MOSFET varactors in a digital manner, which reduces the loss in the resonator. The measured phase noise is -111 dBc/Hz at 1 MHz offset from a 22 GHz carrier. This phase noise level is believed to be the lowest reported so far for an integrated silicon-based VCO in the 20-30 GHz frequency band.

Published in:

Electronics Letters  (Volume:45 ,  Issue: 1 )

Date of Publication:

January 1 2009

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