A Wide Tuning Range CMOS Quadrature Ring Oscillator with Improved FoM for Inductorless Reconfigurable PLL

Ramesh K. Pokharel, Shashank Lingala, Awinash Anand, Prapto Nugroho, Abhishek Tomar, Haruichi Kanaya, Keiji Yoshida

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents the design and implementation of a quadrature voltage-controlled ring oscillator with the improved figure of merit (FOM) using the four single-ended inverter topology. Furthermore, a new architecture to prevent the latch-up in even number of stages composed of single-ended ring inverters is proposed. The design is implemented in 0.18µm CMOS technology and the measurement results show a FOM of -163.8dBc/Hz with the phase noise of -125.8dBc/Hz at 4MHz offset from the carrier frequency of 3.4GHz. It exhibits a frequency tuning range from 1.23GHz to 4.17GHz with coarse and fine frequency tuning sensitivity of 1.08MHz/mV and 120kHz/mV, respectively.
Original languageEnglish
Pages (from-to)1524-1532
Number of pages9
JournalIEICE Transactions on Electronics
Volume94
Issue number10
DOIs
Publication statusPublished - Oct 1 2011

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