Title :
Phase noise in multi-gigahertz CMOS ring oscillators
Author :
Hajimiri, Ali ; Limotyrakis, Sotirios ; Lee, Thomas H.
Author_Institution :
Center for Integrated Syst., Stanford Univ., CA, USA
Abstract :
An analysis of the phase noise in differential and single-ended ring oscillators using a time-variant model is presented. An expression for the RMS value of the impulse sensitivity function (ISF) is derived. A closed-form equation for phase noise of ring oscillators is calculated and a lower limit on the phase noise of ring oscillators is shown. Phase noise measurements of oscillators running up to 5.5 GHz are in good agreement with the theory
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; integrated circuit noise; phase noise; 5.5 GHz; RMS value; closed-form equation; differential ring oscillators; impulse sensitivity function; multi-gigahertz CMOS ring oscillators; noise measurements; single-ended ring oscillators; time-variant model; Clocks; Communication systems; Fluctuations; Noise measurement; Phase measurement; Phase noise; Radio frequency; Ring oscillators; Semiconductor device modeling; Voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 1998. Proceedings of the IEEE 1998
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-4292-5
DOI :
10.1109/CICC.1998.694905
