High performance differential Colpitts VCO with a linearized tuning range using a series resonator

IEICE Electronics Express

Nam-Jin Oh¹ 

[1] Dept. Electronic Engineering, Korea National University of Transportation

关键词: CMOS;    Colpitts;    low-power;    voltage-controlled oscillator;   

DOI  :  10.1587/elex.11.20140432

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(4)Cited-By(1)This paper proposes a novel low-phase noise Colpitts voltage-controlled oscillator (VCO) using a series LC network. For the series LC network, two capacitors are connected to each node of a parallel inductor-varactor tank (PLC). Each series connection node of the network is cross-coupled to the gates of switching transistors, and a large signal swing is achieved at each connection node. Also, the fixed biasing current sources of the differential Colpitts VCO are modified to operate as switched biasing current sources to lower the phase noise. Designed in 65 nm CMOS technology, the proposed VCO achieves a linearized tuning range from 3.73 to 3.97 GHz. The VCO consumes about 0.89 mW from a 0.4 V supply voltage, and achieves the phase noise of �?123.3 dBc/Hz at 1 MHz offset. The calculated figure of merit of the VCO is about �?195.5 dBc/Hz/mW.

【 授权许可】

Unknown