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

doi:10.1587/transele.E94.C.1524

Special Section on Microwave and Millimeter-Wave Technology

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

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Keywords: frequency tuning sensitivity, feed forward technique, figure of merit, phase noise, ring oscillator, reconfigurable wireless system quadrature outputs, 0.18µm CMOS

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2011 Volume E94.C Issue 10 Pages 1524-1532

DOI https://doi.org/10.1587/transele.E94.C.1524

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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.

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