Class-C architecture for cross-coupled FBAR oscillator to further improve phase noise

IEICE Electronics Express

Ramesh K. Pokharel¹  Siti Amalina Enche Ab Rahim² 

[1] Fakulti Kejuruteraan Elektrik, Universiti Teknologi Mara;Graduate School of Information Science and Electrical Engineering, Kyushu University

关键词: class-C oscillator;    FBAR;    cross-coupled topology;   

DOI  :  10.1587/elex.14.20170056

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

In this letter, a class-C architecture for an oscillator employing film bulk acoustic resonator (FBAR) is presented to improve the phase noise significantly in 1/f3 region. The advantages offers by class-C operation are exploited in order to reduce the noise contributed by the current-source transistor in cross-coupled topology. An adaptive biasing circuit is used in order to ensure the oscillation start-up. The post-layout simulation incorporating all parasitic and representing FBAR by modified Butterworth Van Dyke (MBVD) model illustrates the phase noise improvement by 17 dBc/Hz at 100 kHz offset of a 1.9 GHz carrier compared to the FBAR based cross-coupled topology presented by the authors [1].

【 授权许可】

CC BY