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Figure-of-Merit (FoM) optimization in class-C oscillators

Nourbakhsh, A ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.24200/sci.2023.57472.5313
  3. Publisher: 2024
  4. Abstract:
  5. In this paper, a new approach to optimize phase noise and Figure-of-Merit (FoM) in class-C oscillators is presented. This approach recruits DC voltage of the common source node of the switching pair transistors as an indicator to achieve the best performance of a class-C oscillator. The proposed indicator has the advantages of not introducing any loading efiect to the output node, and independency from PVT changes. The method is simple and applicable to any oscillator with class-C topology, and with some modifications it would be applied to other oscillator topologies like class-B. The idea is verified using theoretical analysis, and circuit simulations on 0.18 ųm CMOS technology at 2 GHz oscillation frequency. Moreover, a discrete prototype is fabricated at 15 MHz and measurement results are provided which further validate feasibility of this approach. © 2024, Sharif University of Technology. All rights reserved
  6. Keywords:
  7. Class-C ; FoM ; C (programming language) ; Circuit oscillations ; CMOS integrated circuits ; Electric network analysis ; Microwave oscillators ; Noise figure ; Oscillistors ; Triodes ; Variable frequency oscillators ; Common source ; DC voltage ; Figure-of-merit ; New approaches ; Performance ; Phase-noise ; Saturation ; Source nodes ; Feasibility study ; Optimization ; Oscillation ; Simulation ; Theoretical study ; Topology
  8. Source: Scientia Iranica ; Volume 31, Issue 21 , 2024 , Pages 2032-2040 ; 10263098 (ISSN)
  9. URL: https://scientiairanica.sharif.edu/article_23258.html