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Wide frequency multiphase oscillator designed by coupling two identical ring voltage controlled oscillators
  • mohammad jafar hemmati,
  • Sepehr Ebrahimi Mood,
  • Somayeh Zarei Dehnavi
mohammad jafar hemmati
Sirjan University of Technology

Corresponding Author:[email protected]

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Sepehr Ebrahimi Mood
Yazd University
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Somayeh Zarei Dehnavi
Sirjan University of Technology
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Abstract

This work describes a novel wide tuning range ring voltage controlled oscillator (RVCO) for generating six-phase signals. The proposed circuit is realized by coupling two identical three-stage single-ended inverter based RVCOs. The coupling network injects the common mode signals from one RVCO to the other one and vice versa in cross-connected manner. Three-stage RVCOs used for coupling have been configured by modifying the conventional current-starved RVCO. The proposed six-phase RVCO is optimized using an improved version of Non-dominated Sorting Genetic Algorithm III (NSGAIII). In this algorithm, sigma scaling method is used to control the selection pressure and enhance the performance of the algorithm. The proposed RVCO oscillates at 4.3 GHz. The proposed oscillator can operate from 1.65 GHz to 4.62 GHz under the supply voltage of 1.5 V. This oscillator demonstrates a wide frequency tuning range of 95 %. The proposed RVCO has been designed in 0.18 µm standard CMOS technology and the chip area is 28 × 38.5 µm 2.
Submitted to International Journal of Circuit Theory and Applications
Submission Checks Completed
Assigned to Editor
Reviewer(s) Assigned
20 Jun 2024Review(s) Completed, Editorial Evaluation Pending
22 Jul 2024Editorial Decision: Revise Major
25 Aug 20241st Revision Received
06 Sep 2024Submission Checks Completed
06 Sep 2024Assigned to Editor
06 Sep 2024Review(s) Completed, Editorial Evaluation Pending
12 Sep 2024Reviewer(s) Assigned
25 Sep 2024Editorial Decision: Accept