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Conference Paper
A low-phase noise 5-GHz CCNF Colpitts VCO with parallel-branch inductors
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- Authors
- Ja-Yol Lee, Dongwoo Suh, Sang-Heung Lee, Chan-Woo Park, Jin-Young Kang, Bo-Woo Kim
- Issue Date
- 2005-10
- Citation
- Bipolar/BiCMOS Circuits and Technology Meeting (BCTM) 2005, pp.240-243
- Language
- English
- Type
- Conference Paper
- 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.
- KSP Keywords
- 5 GHz, High Frequency(HF), LC tank, Low frequency noise, Low phase noise, Noise upconversion, Quality-factor(Q-factor), SiGe HBT, Tail current, Thermal noise, bias voltage