DocumentCode :
1423283
Title :
Measurement-based methodology to design harmonic-loaded oscillators using real-time active load pull
Author :
Suh, In-Soo ; Roblin, Patrick ; Doo, S.J. ; Cui, Xiao ; Strahler, J. ; Rojas, Roberto G.
Author_Institution :
Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA
Volume :
5
Issue :
1
fYear :
2011
Firstpage :
77
Lastpage :
83
Abstract :
This study presents a measurement-based methodology to efficiently design a harmonic-loaded oscillator at a targeted frequency using the novel multi-harmonic real-time active load-pull (RT-ALP) technique. Owing to the speed of the RT-ALP technique the design procedure is quasi-interactive. Simulations were first used to design a stable negative resistance around 2.5 GHz using series feedback with a variable tapped capacitor to tune the negative resistance in the desired frequency band. The device lines were then measured for characterising the negative-resistance device versus input power at 2.5 GHz. Using RT-ALP the optimal second- and third-harmonic load impedances that provide the maximum output power were then determined. Two different load circuits were then designed and implemented to approach the optimal multi-harmonic load impedances and realise a stand-alone oscillator. In accordance with the Kurokawa theory, a reasonable agreement is obtained in terms of output power and frequency of oscillation between the stand-alone oscillator built and the multi-harmonic load-pull measurements demonstrating the viability of the proposed method. To our knowledge, this is the first fabricated oscillator designed with experimental active load-pull to consider third-harmonic tuning.
Keywords :
circuit feedback; circuit optimisation; circuit tuning; harmonic oscillators (circuits); integrated circuit design; integrated circuit measurement; negative resistance; Kurokawa theory; RT-ALP technique; frequency 2.5 GHz; harmonic-loaded oscillator; large signal network analyser; load circuit design; measurement-based methodology; multiharmonic real-time active load-pull; oscillator design; quasiinteractive optimisation; second-harmonic load impedance; series feedback; stable negative resistance; stand-alone oscillator; third-harmonic load impedance; third-harmonic tuning; variable tapped capacitor;
fLanguage :
English
Journal_Title :
Microwaves, Antennas & Propagation, IET
Publisher :
iet
ISSN :
1751-8725
Type :
jour
DOI :
10.1049/iet-map.2010.0062
Filename :
5685315
Link To Document :
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