A varactor model including valanche noise source for VCOs phase noise simulation
Paper i proceeding, 2011

Abstract — This work studies an important area of oscillator operation – VCO biased at varactor breakdown. In this operation, the oscillator’s phase noise is primarily determined by avalanche noise generated in the varactor, i.e., the phase noise can be modulated by the incremental shot noise generated at varactor breakdown. A simple experimental diode model was optimized for modeling varactor-breakdown current and an empirical shot noise model based on Hine’s theory presents good agreement with noise power measurements of varactors. The developed varactor noise-model has successfully been used to simulate the phase noise of a single-ended Colpitts InGaP HBT VCO over and beyond the varactor’s breakdown voltage. The VCO presents a phase noise below -100dBc/Hz for varactor voltages lower than breakdown voltage. Beyond the breakdown the phase noise gradually increases to -60 dBc/Hz@100kHz with a centre frequency deviating less than 0.6% from a 7.38GHz carrier.

varactor breakdown

VCO

shot noise

Författare

Szhau Lai

GigaHertz Centrum

Dan Kuylenstierna

GigaHertz Centrum

Iltcho Angelov

GigaHertz Centrum

Klas Eriksson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Vessen Vassilev

GigaHertz Centrum

Rumen Kozhuharov

GigaHertz Centrum

Herbert Zirath

GigaHertz Centrum

41th European Microwave Conference , Manchester, UK, Oct 10-13, 2011

591-594

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Elektroteknik och elektronik

ISBN

978-1-61284-235-6

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Skapat

2017-10-07