1. A 206 ∼ 220 GHz CMOS VCO using body-bias technique for frequency tuning
- Author
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Yi-Ching Wu, Chau-Ching Chiong, Guo-Wei Huang, Po-Han Chiang, Tian-Wei Huang, Wen-De Liu, Huei Wang, and Jen-Hao Cheng
- Subjects
Voltage-controlled oscillator ,Materials science ,Offset (computer science) ,CMOS ,business.industry ,Power consumption ,Chip size ,Phase noise ,Electrical engineering ,dBc ,business ,Cmos vco - Abstract
A 206 ∼ 220 GHz varactor-free voltage-controlled oscillator (VCO) is proposed to improve the output power and tuning range. The topology of the VCO is push-push crosscoupled pair. By using body-bias technique, the parasitic capacitor of the cross-coupled pair can be adjusted, and the varactors in the conventional VCO design can be removed. The proposed VCO was designed and implemented in TSMC 65-nm CMOS technology with a chip size of 0.25 × 0.25 mm2. The tuning range is 6.6% (from 206.2 to 220 GHz). The measured phase noise is −66 dBc/Hz at 1 MHz offset frequency. The output power is 1.3 dBm at 216 GHz with 54-mW dc power consumption and its maximum dc-to-RF efficiency is 2.1%. To the best of our knowledge, this varactor-free VCO achieves the highest dc-to-RF efficiency among published CMOS VCOs around 200 GHz. more...
- Published
- 2015
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