Title :
A noise-shifting differential Colpitts VCO
Author :
Aparicio, Roberto ; Hajimiri, Ali
Author_Institution :
California Inst. of Technol., Pasadena, CA, USA
fDate :
12/1/2002 12:00:00 AM
Abstract :
A novel noise-shifting differential Colpitts VCO is presented. It uses current switching to lower phase noise by cyclostationary noise alignment and improve the start-up condition. A design strategy is also devised to enhance the phase noise performance of quadrature coupled oscillators. Two integrated VCOs are presented as design examples.
Keywords :
MOS analogue integrated circuits; UHF integrated circuits; UHF oscillators; integrated circuit design; integrated circuit noise; phase noise; voltage-controlled oscillators; 1.8 to 2.45 GHz; 1.87 GHz; 2.1 GHz; BiCMOS process; Colpitts VCO; NMOS transistors; analog ICs; current switching; cyclostationary noise alignment; design strategy; integrated VCOs; noise generation mechanisms; noise-shifting differential VCO; phase noise performance; phase noise reduction; quadrature coupled oscillators; start-up condition improvement; Active noise reduction; CMOS integrated circuits; Coupling circuits; Integrated circuit noise; Noise generators; Phase noise; Radio frequency; Radiofrequency integrated circuits; Topology; Voltage-controlled oscillators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2002.804354
