Title :
11-GHz CMOS differential VCO with back-gate transformer feedback
Author :
Nam-Jin Oh ; Sang-Gug Lee
Author_Institution :
Dept. of Eng., Inf. & Commun. Univ., Daejeon, South Korea
Abstract :
A fully integrated back-gate transformer feedback CMOS differential voltage-controlled oscillator (VCO) has been designed for high-frequency and low-phase noise operation using an 0.18-μm CMOS process. The proposed VCO topology utilizes the monolithic transformer feedback configuration from the drain to the back-gate of the switching transistors in VCO. The VCO operating in an 11-GHz band shows the phase noise of -109dBc/Hz at 1-MHz offset, and draws around 3.8mA in the differential core circuits from a 1.8-V power supply.
Keywords :
CMOS integrated circuits; differential transformers; microwave oscillators; phase noise; voltage-controlled oscillators; 0.18 micron; 1.8 V; 11 GHz; CMOS differential VCO; CMOS process; back-gate transformer feedback; differential core circuits; high-frequency operation; low-phase noise operation; monolithic transformer feedback configuration; phase noise; switching transistor; voltage-controlled oscillator; CMOS process; Circuit topology; Feedback; Feeds; Frequency; Impedance; Parasitic capacitance; Phase noise; Semiconductor device modeling; Voltage-controlled oscillators; Back-gate; CMOS; monolithic transformer; phase noise; voltage-controlled oscillator (VCO);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.858994
