New oscillator concept based on band edge degeneracy in lumped double‐ladder circuits. Issue 7 (1st July 2019)

• Record Type: Journal Article
• Authors: Oshmarin, Dmitry; Yazdi, Farshad; Othman, Mohamed A.K.; Sloan, Jeff; Radfar, Mohammad; Green, Michael M.; Capolino, Filippo
• Is Part Of: IET circuits, devices & systems. Volume 13:Issue 7(2019)
• Page Start: 950
• Page End: 957
• Publication Date: 2019-07-01
• Subjects: Q-factor -- ladder networks -- eigenvalues and eigenfunctions -- microwave oscillators -- lumped parameter networks -- LC circuits; band edge degeneracy -- lumped double-ladder circuits -- degenerate band edge -- DBE -- periodic ladder resonant circuit -- double-ladder resonant circuit -- lumped elements -- phase-frequency eigenstates -- single-ladder circuit -- single LC ladder circuit -- LC oscillator -- double-ladder oscillator -- unique mode selection scheme -- single-frequency oscillations -- single-ladder oscillators -- Q-factor resonance; Electronic circuits -- Periodicals; Electronic systems -- Periodicals; 621.381505
• DOI: 10.1049/iet-cds.2018.5048
• Languages: English
• ISSNs: 1751-858X

Abstract

Abstract : 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.