Title :
Capacitively averaged multi-phase LC oscillators
Author :
Park, JunYoung ; Flynn, Michael P.
Author_Institution :
Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
Abstract :
This paper addresses the improvement of phase noise and phase accuracy in coupled rings of LC oscillators. A new method incorporating coupling both with capacitors and transistors is presented. A number of 4 GHz, coupled, three stage LC oscillator rings were fabricated in 0.18 μm CMOS. The measured rms jitter and phase noise of a capacitively averaged ring are 1.183 ps, and -133.67 dBc/Hz at 1 MHz offset, respectively.
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; coupled circuits; phase noise; timing jitter; 0.18 micron; 4 GHz; CMOS; capacitively averaged oscillators; capacitor coupling; coupled ring LC oscillators; jitter; multiphase LC oscillators; multistage oscillator rings; phase accuracy; phase noise; transistor coupling; Capacitors; Clocks; Computer science; Injection-locked oscillators; MOSFETs; Phase noise; Q factor; Radio frequency; Resonant frequency; Ring oscillators;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465171
