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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
IEICE TRANSACTIONS on Electronics
Publication Date: 2011/10/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Active Devices and Circuits
frequency tuning sensitivity, feed forward technique, figure of merit, phase noise, ring oscillator, reconfigurable wireless system quadrature outputs, 0.18 µm CMOS,
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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 0.18 µm CMOS technology and the measurement results show a FOM of -163.8 dBc/Hz with the phase noise of -125.8 dBc/Hz at 4 MHz offset from the carrier frequency of 3.4 GHz. It exhibits a frequency tuning range from 1.23 GHz to 4.17 GHz with coarse and fine frequency tuning sensitivity of 1.08 MHz/mV and 120 kHz/mV, respectively.