Title :
A low-phase noise 5-GHz CCNF Colpitts VCO with parallel-branch inductors
Author :
Lee, Ja-Yol ; Suh, Dongwoo ; Lee, Sang-Heung ; Park, Chan-Woo ; Kang, Jin-Young ; Kim, Bo-Woo
Author_Institution :
Electron. & Telecommun. Res. Inst., Daejeon, South Korea
Abstract :
In this paper, we propose both the 5 GHz CCNF Colpitts LC-tank VCO with less flicker noise upconversion and the parallel-branch inductor with 12 % Q-factor improvement. The proposed CCNF Colpitts LC-tank VCO suppresses flicker noise induced low-frequency noise of the conventional Colpitts differential pair as well as the high-frequency thermal noise of tail current. Therefore, the proposed CCNF LC-tank VCO represents about 25-dB improvement of phase noise compared to the conventional Colpitts LC-tank VCO. In this paper, two kinds of VCOs have been manufactured using SiGe HBT process technology, and consume 12 mA at 2 V bias voltage.
Keywords :
Ge-Si alloys; Q-factor; bipolar integrated circuits; flicker noise; heterojunction bipolar transistors; inductors; microwave oscillators; voltage-controlled oscillators; 12 mA; 2 V; 5 GHz; CCNF Colpitts voltage controlled oscillator; Colpitts differential pair; HBT process technology; LC-tank voltage controlled oscillator; Q-factor improvement; SiGe; flicker noise suppression; flicker noise upconversion; high-frequency thermal noise; parallel-branch inductors; tail current; 1f noise; Inductors; Low-frequency noise; Manufacturing processes; Phase noise; Pulp manufacturing; Q factor; Silicon germanium; Tail; Voltage-controlled oscillators;
Conference_Titel :
Bipolar/BiCMOS Circuits and Technology Meeting, 2005. Proceedings of the
Print_ISBN :
0-7803-9309-0
DOI :
10.1109/BIPOL.2005.1555241
