Title :
A 0.83-2.5-GHz continuously tunable quadrature VCO
Author :
Guermandi, Davide ; Tortori, Paola ; Franchi, Eleonora ; Gnudi, Antonio
Author_Institution :
Adv. Res. Center for Electron. Syst., Univ. of Bologna, Italy
Abstract :
A quadrature VCO with ±50% continuous 0.83-2.5-GHz tuning range is presented. It is based on a core LC-QVCO with ±20% tuning range, a single sideband mixer (SSBM), two frequency dividers and a multiplexer. The circuit has been implemented in a 0.13-μm 1.2-V CMOS technology. The additional area with respect to the core LC-QVCO is 100 μm×100 μm. Quadrature error is less than 2°; the phase noise is less than -120 dBc/Hz @ 1 MHz over the whole tuning range and is mainly due to the LC-QVCO. Spurs are more than 34 dB below the fundamental in the worst case.
Keywords :
CMOS analogue integrated circuits; UHF integrated circuits; UHF mixers; UHF oscillators; frequency dividers; multiplexing equipment; voltage-controlled oscillators; 0.13 micron; 0.83 to 2.5 GHz; 1.2 V; CMOS frequency synthesis; CMOS technology; UHF oscillators; continuously tunable quadrature VCO; frequency dividers; multiplexer; single sideband mixer; voltage controlled oscillator; CMOS technology; Circuit optimization; Frequency conversion; Frequency synthesizers; Multiplexing; Phase noise; Transceivers; Tunable circuits and devices; Tuning; Voltage-controlled oscillators; CMOS frequency synthesis; LC-QVCO; RF CMOS; continuous tuning range; wideband VCO;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2005.857427
