Title :
A 40 GHz modified-Colpitts voltage controlled oscillator with increased tuning range
Author :
Su, Chao ; Thoka, Sreenath ; Tiew, Kee-Chee ; Geiger, Randall L.
Author_Institution :
Dept. of Electr. Eng. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
A 40 GHz modified-Colpitts voltage controlled oscillator (VCO) is presented that offers wider tuning range than the basic Colpitts structure with comparable phase noise performance. The modification entails the addition of a negative-resistance to compensate for the low-Q of the microstrip lines used as the inductive element. Simulations show a 15% increase in tuning range for the modified Colpitts VCO, a significant improvement over that of the basic structure.
Keywords :
Q-factor; bipolar MIMIC; circuit tuning; compensation; integrated circuit design; integrated circuit noise; microstrip circuits; millimetre wave oscillators; negative resistance; phase noise; voltage-controlled oscillators; 40 GHz; EHF; MM-wave voltage controlled oscillator; low-Q compensation; microstrip line Q-factor; modified Colpitts VCO; negative-resistance; phase noise performance; tuning range; CMOS technology; Circuits; Cutoff frequency; Inductance; Inductors; Phase noise; Polynomials; Spirals; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205664
