Print Email Facebook Twitter Tuning Range Extension of a Transformer-Based Oscillator Through Common-Mode Colpitts Resonance Title Tuning Range Extension of a Transformer-Based Oscillator Through Common-Mode Colpitts Resonance Author Shahmohammadi, M. (Catena) Babaie, M. (TU Delft Electronics) Staszewski, R.B. (TU Delft Electronics) Date 2017 Abstract In this paper, we propose a method to broaden a tuning range of a CMOS LC-tank oscillator without sacrificing its area. The extra tuning range is achieved by forcing a strongly coupled transformer-based tank into a common-mode resonance at a much higher frequency than in its main differential-mode oscillation. The oscillator employs separate active circuits to excite each mode but it shares the same tank, which largely dominates the core area but is on par with similar single-core designs. The tank is forced in common-mode oscillation by two injection locked Colpitts oscillators at the transformer's primary winding, while a two-port structure provides differential-mode oscillation. An analysis is also presented to compare the phase noise performance of the dual-core oscillator in common-mode and differential-mode excitations. A prototype implemented in digital 40-nm CMOS verifies the dual-mode oscillation and occupies only 0.12 mm2 and measures 56% tuning range. Subject Colpitts oscillatorCommon-mode oscillationinductor-capacitor (LC) tanktransformerwide tuning range To reference this document use: http://resolver.tudelft.nl/uuid:32ad43c4-23ff-41d1-9601-e65d9c9bc71c DOI https://doi.org/10.1109/TCSI.2016.2625199 ISSN 1549-8328 Source IEEE Transactions on Circuits and Systems Part 1: Regular Papers, 64 (4), 836-846 Part of collection Institutional Repository Document type journal article Rights © 2017 M. Shahmohammadi, M. Babaie, R.B. Staszewski Files PDF 07876717_1.pdf 5.91 MB Close viewer /islandora/object/uuid:32ad43c4-23ff-41d1-9601-e65d9c9bc71c/datastream/OBJ/view