Open AccessNew oscillator concept based on band edge degeneracy in lumped double‐ladder circuits
Author(s) -
Oshmarin Dmitry,
Yazdi Farshad,
Othman Mohamed A.K.,
Sloan Jeff,
Radfar Mohammad,
Green Michael M.,
Capolino Filippo
Publication year - 2019
Publication title -
iet circuits, devices and systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.251
H-Index - 49
eISSN - 1751-8598
pISSN - 1751-858X
DOI - 10.1049/iet-cds.2018.5048
Subject(s) - vackář oscillator , oscillation (cell signaling) , lc circuit , physics , degenerate energy levels , pierce oscillator , resonance (particle physics) , electronic circuit , degeneracy (biology) , parametric oscillator , topology (electrical circuits) , voltage controlled oscillator , quantum mechanics , engineering , electrical engineering , capacitor , bioinformatics , biology , voltage , genetics
An oscillator scheme based on the degenerate band edge (DBE) in a periodic, double‐ladder resonant circuit made of lumped elements is proposed for the first time. The circuit exhibits a DBE in the dispersion diagram of its phase‐frequency eigenstates and possesses unique resonance features associated with a high loaded Q ‐factor resonance, compared to a single‐ladder circuit. This oscillator is shown to have an oscillation threshold that is half that of a single LC ladder circuit having the same total quality factor, and thus is more robust than an LC oscillator in the presence of losses. Moreover, the double‐ladder oscillators have a unique mode selection scheme that leads to stable single‐frequency oscillations even when the load is varied. It is also shown that the output amplitude of the double‐ladder oscillator is much less sensitive to the output loading compared to single‐ladder oscillators. The authors show the analysis and design of such oscillators that potentially lead to enhancing the efficiency of RF components and sources.