Title :
A wide tuning range −163 FOM CMOS quadrature ring oscillator for inductorless reconfigurable PLL
Author :
Lingala, S. ; Pokharel, R.K. ; Tomar, A. ; Kanaya, H. ; Yoshida, K.
Author_Institution :
Grad. Sch. of ISEE, Kyushu Univ., Fukuoka, Japan
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. A new topology to prevent the latch-up in single ended ring oscillators 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 3.62 GHz. It exhibits a frequency tuning range from 1.23 GHz to 4.17 GHz with coarse and fine frequency sensitivity of 1.08 MHz/mV and 120 kHz/mV, respectively.
Keywords :
CMOS integrated circuits; invertors; network topology; oscillators; phase locked loops; CMOS quadrature ring oscillator; figure of merit; frequency 1.23 GHz to 4.17 GHz; inductorless reconfigurable PLL; quadrature voltage-controlled ring oscillator; single-ended inverter topology; size 0.18 mum; CMOS integrated circuits; Frequency measurement; Inverters; Phase noise; Ring oscillators; Tuning;
Conference_Titel :
Signals Systems and Electronics (ISSSE), 2010 International Symposium on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-6352-7
DOI :
10.1109/ISSSE.2010.5607106
