Title :
Design of a Colpitts oscillator using microstrip line inductor compensated for low Q
Author :
Su, Chao ; Thoka, Sreenath ; Tiew, Kee-Chee ; Geiger, R.L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
In this paper, a modified differential bipolar Colpitts Voltage Controlled Oscillator (VCO) is presented The VCO has a simulated tuning range of 25.45% centered at 44 GHz. The on-chip inductor is implemented with microstrip lines, which have an inductance of 590 pH at 44 GHz and a Q of 1.4. To compensate for the low Q of the inductor, the Colpitts VCO is modified to include a negative resistor (-Gm). The VCO operates under a 3.3 v supply. The power dissipation is 66 mW at 44 GHz. The VCO is implemented in a 120 GHz fT SiGe BiCMOS process.
Keywords :
BiCMOS analogue integrated circuits; Ge-Si alloys; Q-factor; circuit tuning; inductors; microstrip circuits; negative resistance circuits; radiofrequency integrated circuits; radiofrequency oscillators; semiconductor materials; voltage-controlled oscillators; 3.3 V; 44 GHz; 66 mW; Q-factor; SiGe; SiGe BiCMOS process; differential bipolar Colpitts voltage controlled oscillator; microstrip line inductor; negative resistor; power dissipation; tuning range; BiCMOS integrated circuits; Germanium silicon alloys; Inductance; Inductors; Microstrip; Power dissipation; Resistors; Silicon germanium; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on
Print_ISBN :
0-7803-7523-8
DOI :
10.1109/MWSCAS.2002.1187171
