Dual-band quadrature voltage-controlled oscillator using differential inner-diamond-structure switchable inductor

Pei Kang Tsai, Tzuen Hsi Huang, Yu Ting Chen

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3 Citations (Scopus)


A dual-band quadrature voltage-controlled oscillator (QVCO) with high figure-of-merits (FOMs) and cost-area efficiency is presented by integrating with differential inner-diamond-structure switchable inductors which have improved performances. This proposed QVCO is fabricated in a 0.18-μm complementary metal-oxide semiconductor process with an active-region area of 0.61 mm2. The QVCO core totally consumes 6.8 mA from 1.8 V supply voltage. The frequency tuning ranges are 120 MHz (from 3.18 to 3.3 GHz) for the low-band and 500 MHz (from 6.94 to 7.44 GHz) for the high-band, while the tuning voltage rises from 0 to 1.8 V. The best phase noises with an offset frequency of 1 MHz from the oscillation frequency in the low- and high-bands are -121.9 and -117.5 dBc/Hz, respectively. The measured phase errors in both highband and low-band are less than 1o. The calculated FOMs, no matter the switch is offor on, are better than -180 dBc/Hz.

Original languageEnglish
Pages (from-to)368-375
Number of pages8
JournalIET Circuits, Devices and Systems
Issue number6
Publication statusPublished - 2013 Dec 27

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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