Title :
Development of dual band digitally controlled oscillator using Fibonacci sequence in 0.18 um CMOS process
Author :
Miyahara, K. ; Kanemoto, Daisuke ; Pokharel, Ramesh K. ; Yoshida, Kenta ; Kanaya, Haruichi
Author_Institution :
Dept. of Electron., Kyushu Univ., Fukuoka, Japan
Abstract :
This paper presents a digitally controlled oscillator (DCO) in inductor-capacitor (LC) topology with dual -band and fine frequency tuning steps. Using special Fibonacci sequence method and additional capacitor in the capacitor bank, this DCO operates two differential frequency bands and achieves finer tuning range than that of a conventional binary sequence DCO. The proposed circuit is implemented in 0.18 um CMOS technology and tested. It has a high-band frequency of 4.01-4.54 GHz and low-band frequency of 3.41-3.74 GHz. The measured phase noise is -119.3 and -104.5 (dBc/Hz at 1MHz offset) at carrier frequency at 4.54 GHz and 3.41 GHz.
Keywords :
CMOS integrated circuits; Fibonacci sequences; binary sequences; circuit tuning; digital control; oscillators; CMOS process; Fibonacci sequence; binary sequence; capacitor bank; dual band digitally controlled oscillator; fine frequency tuning steps; frequency 3.41 GHz to 3.74 GHz; frequency 4.01 GHz to 4.54 GHz; inductor capacitor topology; size 0.18 mum; Capacitance; Capacitors; Dual band; Frequency measurement; Oscillators; Tuning; Fibonacci sequence; digitally controlled oscillator; dual-band; frequency tuning step;
Conference_Titel :
TENCON 2013 - 2013 IEEE Region 10 Conference (31194)
Conference_Location :
Xi´an
Print_ISBN :
978-1-4799-2825-5
DOI :
10.1109/TENCON.2013.6718451
