Title :
A symmetrical 6-GHz fully integrated cascode coupling CMOS LC quadrature VCO
Author :
Jae-Hong Chang ; Choong-Ki Kim
Author_Institution :
Electr. Eng. & Comput. Sci. Dept., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
A fully symmetrical integrated quadrature LC oscillator with a wide tuning range of 1.2GHz is presented. The quadrature voltage-controlled oscillator (QVCO) is implemented using a symmetrical coupling method which has been used to produce the large tuning range with a low control voltage and to achieve good phase noise performance in 0.18μm complementary metal oxide semiconductor technology. The measured phase noise at 1MHz offset from the center frequency (5.5GHz) is -115 dBc/Hz. The QVCO draws 3.2mA from a 1.8V supply. The equivalent phase error between I and Q signal was at most 0.5/spl deg/.
Keywords :
1/f noise; CMOS integrated circuits; MMIC oscillators; voltage-controlled oscillators; 0.18 micron; 1.2 GHz; 1.8 V; 1/f noise; 3.2 mA; 5.5 GHz; 6 GHz; CMOS LC quadrature VCO; cascode coupling; complementary metal oxide semiconductor; equivalent phase error; phase noise; quadrature voltage-controlled oscillator; symmetrical coupling method; tuning range; Degradation; Energy consumption; FETs; Frequency; Low voltage; Phase noise; Semiconductor device noise; Tuning; Voltage control; Voltage-controlled oscillators; complementary metal oxide semiconductor (CMOS); quadrature; voltage-controlled oscillator (VCO);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.856850
