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Optimum design of high power and high efficiency mm-wave fundamental oscillators

Shirinabadi, H ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1002/cta.2503
  3. Publisher: John Wiley and Sons Ltd , 2018
  4. Abstract:
  5. A systematic method to design high power and high efficiency mm-wave fundamental oscillators is presented. By using a linear time variant method, we first obtain the optimum conditions and show that these conditions can be significantly different for high power and high efficiency fundamental oscillation. Next, we propose a modified multistage ring oscillator with interstage passive networks to exploit the full capacity of the transistors in terms of output power or efficiency. Analytical expressions are also derived to determine the value of passive elements used in the oscillator. To verify the validity of the method, a 77-GHz two-stage (differential) VCO is designed in a 65-nm CMOS process. Careful electromagnetic and circuit simulations demonstrate that the designed VCO has 2-GHz tuning range, maximum output power of 10.5 dBm and maximum DC to RF efficiency of 24.1%. The designed VCO shows 54.8% and 108.7% improvement in terms of maximum output power and efficiency compared with a conventional cross-coupled VCO with the same tuning range. © 2018 John Wiley & Sons, Ltd
  6. Keywords:
  7. 77 GHz ; CMOS ; Cross-coupled oscillator ; High efficiency mm-wave oscillator ; High power mm-wave oscillator ; Linear time variant method ; Modified ring oscillator ; Circuit simulation ; CMOS integrated circuits ; Design ; Efficiency ; Electromagnetic simulation ; Tuning ; Variable frequency oscillators ; Cross-coupled oscillators ; Linear time variant ; Mm waves ; Ring oscillator ; Millimeter waves
  8. Source: International Journal of Circuit Theory and Applications ; Volume 46, Issue 8 , 2018 , Pages 1443-1461 ; 00989886 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/cta.2503