Abstract
AbstractThis letter proposes a dual‐band CMOS voltage‐controlled oscillator (VCO) implemented with a distributed composite right/left‐handed (CRLH) LC network.The VCO consists of four units of left‐handed LC resonator stacked in series, the LC resonator in shunt with a pair of cross‐coupled transistors, and a varactor serving as frequency band switching element. The parasitic inductors turn the left‐handed LC network to a CRLH network. In the fundamental mode, the VCO operates at the high‐frequency band. In harmonic mode, the oscillator provides low‐frequency band outputs. The VCO exploits the multiple oscillation mode of the CRLH standing wave oscillator. The proposed VCO has been implemented with the TSMC 0.18 μm 1P6M CMOS technology. It can generate differential signals in the high‐band frequency range of 7.23–7.86 GHz and in the low‐band frequency range of 3.81–5.32 GHz. The die area of the VCO is 0.991 × 0.815 mm2. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:985–988, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27487
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