Title :
Synchronization of mutually coupled LC-oscillators
Author :
Allam, A. ; Filanovsky, I.M. ; Oliveira, Luís Bica ; Fernandes, Jorge R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta.
Abstract :
It is shown that synchronization is similar to amplitude stabilization: both mechanisms involve creation of harmonics and frequency reduction. Synchronization of LC-oscillators can be achieved using similar synchronizing circuits in each oscillator connected in parallel with the tank. The output of the first synchronization circuit is routed to the second oscillator and vice versa. This scheme provides coupling using first, third and other odd harmonics. In addition, introducing coupling between common mode outputs of the synchronizing circuits provides second and other even harmonic coupling. This type of coupling may be also used between common mode outputs of amplitude stabilization circuits. The benefits of using simultaneous first and second harmonic coupling were verified designing a low-power, low phase noise 5 GHz LC oscillator with quadrature outputs. The oscillator phase noise is lower than -121.2 dBc/Hz at 1-MHz offset over the tuning range with a power consumption of 1.8 mW achieving a FOM lower than -192.2 dBc/Hz
Keywords :
coupled circuits; microwave oscillators; phase noise; synchronisation; 1.8 mW; 5 GHz; LC-oscillator synchronisation; amplitude stabilization circuits; common mode outputs; harmonic coupling; oscillator phase noise; synchronizing circuits; Circuit noise; Circuit optimization; Coupling circuits; Current supplies; Differential equations; Energy consumption; Frequency synchronization; Mutual coupling; Oscillators; Phase noise; Coupled LC oscillators; phase accuracy; phase noise; quadrature oscillators;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693579
