Title :
Quadrature VCO based on direct second harmonic locking
Author :
Tortori, P. ; Guermandi, D. ; Franchi, E. ; Gnudi, A.
Author_Institution :
ARCES-DEIS, Universita di Bologna, Italy
Abstract :
The paper proposes a quadrature VCO based on two LC-oscillators directly coupled by means of second harmonic such that extra inductors or extra current are not required. A simple model is presented clarifying the following points: i) existence and stability of steady state solutions, ii) phase noise transfer function, iii) phase deviation from ideal quadrature versus tank mismatches. A design is presented in CMOS 0.13 μm technology, operating at 1.8GHz, 1.2V supply, with 4 mA total current consumption. Simulation results exhibit -128 dBc/Hz at 1 MHz phase noise and 2° quadrature error for 0.5% mismatch between the two tanks.
Keywords :
CMOS integrated circuits; harmonic analysis; phase noise; transfer functions; voltage-controlled oscillators; 0.13 microns; 1 MHz; 1.2 V; 1.8 GHz; 4 mA; CMOS technology; LC-oscillators; direct second harmonic locking; ideal quadrature versus tank mismatches; phase deviation; phase noise transfer function; quadrature VCO; quadrature error; steady state solutions; CMOS technology; Inductors; Liquid crystal on silicon; Phase noise; Semiconductor device modeling; Stability; Steady-state; Transceivers; Transfer functions; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328158
