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<p>This paper presents a novel wide-range tunable ring voltage-controlled oscillator (VCO) implemented in a standard 0.18-μm CMOS technology. The proposed architecture addresses the inherent tuning range limitations of conventional ring VCOs by incorporating a band-switching mechanism. This mechanism dynamically alters the effective number of delay stages within the oscillator loop through selectable signal paths. The design significantly extends the overall frequency tuning range by enabling the VCO to switch among four distinct configurations (one, two, four, and eight delay cells). Post-layout simulations demonstrate a tuning range from 254 to 1267&#xa0;MHz, yielding a tuning ratio of 4.99. Experimental measurements of the fabricated chip confirm the effectiveness of the proposed approach, exhibiting an even wider tuning range from 283.3 to 1.56&#xa0;GHz, with a maximum tuning ratio of approximately 5.5. The measured phase noise at a 1&#xa0;MHz offset from a 300&#xa0;MHz oscillation frequency is − 106.3 dBc/Hz. This work validates the feasibility and advantages of the proposed multi-band switchable ring VCO for applications requiring wide frequency agility and adaptability.</p>

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Wide-Range Tunable Ring VCO with Band-Switching in 0.18-µm CMOS Technology

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Jau-Ji Jou,
  • Po-Yen Wang,
  • Bo-Hong Liu,
  • Chun-Liang Yang,
  • Chih-Lung Tseng

摘要

This paper presents a novel wide-range tunable ring voltage-controlled oscillator (VCO) implemented in a standard 0.18-μm CMOS technology. The proposed architecture addresses the inherent tuning range limitations of conventional ring VCOs by incorporating a band-switching mechanism. This mechanism dynamically alters the effective number of delay stages within the oscillator loop through selectable signal paths. The design significantly extends the overall frequency tuning range by enabling the VCO to switch among four distinct configurations (one, two, four, and eight delay cells). Post-layout simulations demonstrate a tuning range from 254 to 1267 MHz, yielding a tuning ratio of 4.99. Experimental measurements of the fabricated chip confirm the effectiveness of the proposed approach, exhibiting an even wider tuning range from 283.3 to 1.56 GHz, with a maximum tuning ratio of approximately 5.5. The measured phase noise at a 1 MHz offset from a 300 MHz oscillation frequency is − 106.3 dBc/Hz. This work validates the feasibility and advantages of the proposed multi-band switchable ring VCO for applications requiring wide frequency agility and adaptability.