Title :
A 20kHz frequency resolution DCO
Author :
Bai, Zhanjun ; Mason, Ralph
Author_Institution :
Dept. of Electron., Carleton Univ., Ottawa, ON, Canada
Abstract :
This paper reports a Digitally Controlled Oscillator (DCO) with 20kHz frequency resolution. This is the first DCO implementing capacitor delta tuning and Dynamic Element Matching (DEM) to suppress process variations and mismatches between small capacitor deltas. The DCO is fabricated in 0.13μm CMOS IBM technology. The proposed DEM technique reduced the process variations and mismatches from 95% to 33.5% for the minimum capacitance step. The oscillator has a frequency tuning range from 108MHz to 133MHz with a centre frequency at 120.5MHz and forms part of an RF injection locked oscillator. The output frequency is covered by 8192 tuning steps. The measured frequency characteristics are provided in this paper. The DCO consumes 1.7mW power from a 1.185V voltage supply.
Keywords :
CMOS integrated circuits; capacitors; radiofrequency oscillators; tuning; CMOS IBM technology; RF injection locked oscillator; capacitor delta tuning; digitally controlled oscillator; dynamic element matching; frequency 108 MHz to 133 MHz; frequency 20 kHz; frequency resolution; power 1.7 mW; size 0.13 mum; voltage 1.185 V; Capacitance; Capacitors; Frequency measurement; Oscillators; Phase locked loops; Tuning;
Conference_Titel :
Solid-State and Integrated Circuit Technology (ICSICT), 2010 10th IEEE International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-5797-7
DOI :
10.1109/ICSICT.2010.5667770
