Title :
Ku-band InGaP-GaAs HBT MMIC VCOs with balanced and differential topologies
Author :
Baek, Donghyun ; Ko, Sangsoo ; Kim, Jeong-Geun ; Kim, Dong-Wook ; Hong, Songcheol
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
fDate :
4/1/2004 12:00:00 AM
Abstract :
Balanced and differential voltage controlled oscillators (VCOs) are investigated with analytic noise models. Fully integrated VCOs in Ku-band are implemented on an InGaP-GaAs heterojunction bipolar transistor technology. The balanced VCO has higher output power and lower phase-noise performance, while drawing lower current than the differential VCO. This coincides with the analytical expectation. The shot noise of collector current contributes less to the phase noise in the balanced VCO (B-VCO) than in the differential VCO. The B-VCO shows 2-3 dB lower phase-noise performances of 90.5, -113.8dBc/Hz at the offset frequencies 100 kHz, and 1-MHz offset at 13.5 GHz than the differential VCO, and figures of merit of 180.7 and -177.6dBc/Hz are achieved, respectively.
Keywords :
III-V semiconductors; MMIC oscillators; bipolar MMIC; gallium arsenide; indium compounds; integrated circuit modelling; integrated circuit noise; network topology; phase noise; voltage-controlled oscillators; 13.5 GHz; 2 to 3 dB; InGaP-GaAs; Ku-band InGaP-GaAs HBT MMIC; Ku-band InGaP-GaAs heterojunction bipolar transistor MMIC; collector current; differential VCO; differential voltage controlled oscillator; phase noise; Frequency; Heterojunction bipolar transistors; MMICs; Mobile communication; Phase noise; Power generation; Q factor; Topology; Voltage; Voltage-controlled oscillators;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2004.825726
