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Nonlinear Characterization of Varactors for Tunable Networks by Active Source-Pull and Load-Pull

Christer Andersson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Mattias Thorsell (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Niklas Rorsman (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik)
IEEE Transactions on Microwave Theory and Techniques (0018-9480). Vol. 59 (2011), 7, p. 1753-1760.
[Artikel, refereegranskad vetenskaplig]

Varactors are key components in the realization of tunable networks, for instance, in high-efficiency power-amplifier architectures. This paper presents a method to measure the varactor quality factor (Q-factor) in the presence of nonlinear distortion. The importance of correctly choosing the loading condition at the second harmonic is illustrated by multiharmonic active source- and load-pull measurements. Furthermore, the method also allows for accurate extraction of the bias-dependent series resistance without the need of area consuming resonant structures. The proposed method is applied to characterize a silicon-carbide (SiC) Schottky diode varactor at 3 GHz. The measured results reemphasize that varactors are not linear tunable, but inherently nonlinear components that require proper consideration of the higher order harmonics.

Nyckelord: Load-pull, nonlinear measurement, Q-factor, series resistance, silicon-carbide (SiC), source-pull, varactor, energy relations, millimeter-wave, high-power, carbide, loach bc, 1964, vmt12, p15



Denna post skapades 2011-09-15. Senast ändrad 2015-07-28.
CPL Pubid: 146226