Simulation Investigation of Millimeter Wave Varactor-tuned Transmission Cavity-stabilized Oscillator |
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Authors: | Dalong Zhu and Jinping Xu |
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Institution: | (1) State Key Lab. of Millimeter Waves, Southeast University, Nanjing, 210096, People’s Republic of China |
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Abstract: | A new circuit configuration for millimeter wave varactor-tuned transmission cavity-stabilized oscillator has been proposed
in this paper. Compared to conventional varactor-tuned reflection cavity-stabilized oscillator, in this configuration, a high
quality factor transmission cavity directly coupled to varactor diode is employed to improve the performances of the oscillator.
The operation frequency of this oscillator can be tuned by varying the resonant frequency of the transmission cavity through
changing bias voltage of the varactor diode. An equivalent circuit model for the oscillator has been presented in order to
theoretically investigate the performance characteristics of the oscillator. On the basis of this model, electrical tuning
characteristics have been studied. Mode jumping phenomena during electrical tuning process have been analyzed for obtaining
stable operations of the oscillator. The analytical formulae of quality factor and efficiency have been derived in terms of
relevant circuit parameters. Particular emphasis has been paid on several circuit parameters which have a substantial impact
on circuit performance. Some design considerations have been pointed out according to the simulation results, which are useful
to the design and fabrication of this type of oscillators. |
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Keywords: | Keyword" target="_blank">Keyword Millimeter wave oscillator Varactor-tuned Transmission cavity Electrical tuning characteristics Quality factor Efficiency |
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