title: Ultralow-phase-noise oscillators based on BAW resonators.
abstract: This paper presents two 2.1-GHz low-phase noise oscillators based on BAW resonators. Both a single-ended common base structure and a differential Colpitts structure have been implemented in a 0.25-μm BiCMOS process. The detailed design methods including the realization, optimization, and test are reported. The differential Colpitts structure exhibits a phase noise 6.5 dB lower than the single-ended structure because of its good performance of power noise immunity. Comparison between the two structures is also carried out. The differential Colpitts structure shows a phase noise level of -87 dBc/Hz at 1-kHz offset frequency and a phase noise floor of -162 dBc/Hz, with an output power close to -6.5 dBm and a core consumption of 21.6 mW. Furthermore, with the proposed optimization methods, both proposed devices have achieved promising phase noise performance compared with state-of-the-art oscillators described in the literature. Finally, we briefly present the application of the proposed BAW oscillator to a micro-atomic clock.
authors.forename: Mingdong
authors.initials: M
authors.lastname: Li
authors.forename: Seonho
authors.initials: S
authors.lastname: Seok
authors.forename: Nathalie
authors.initials: N
authors.lastname: Rolland
authors.forename: Paul
authors.initials: P
authors.lastname: Rolland
authors.forename: Hassan
authors.initials: H
authors.lastname: El Aabbaoui
authors.forename: Emeric
authors.initials: E
authors.lastname: de Foucauld
authors.forename: Pierre
authors.initials: P
authors.lastname: Vincent
authors.forename: Vincent
authors.initials: V
authors.lastname: Giordano