Title :
A K-band low phase noise transformer coupled Colpitts VCO in 0.18-µm CMOS technology
Author :
Hsieh, Chi-Kai ; Kao, Kun-Yao ; Lin, Kun-You
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
A K-band low phase noise Colpitts VCO was developed in 0.18-μm CMOS technology. The modified Colpitts VCO which uses a transformer to combine the main transistors and current switch transistors is proposed to improve the output voltage swing and the phase noise. The VCO achieves a good phase noise of -115 dBc/Hz at 1 MHz offset, and the chip size is 0.35 mm2.
Keywords :
CMOS integrated circuits; MMIC oscillators; field effect MMIC; phase noise; transformers; voltage-controlled oscillators; CMOS technology; MMIC oscillators; current switch transistors; low phase noise transformer coupled Colpitts VCO; voltage swing; voltage-controlled oscillators; CMOS integrated circuits; CMOS technology; K-band; Phase noise; Transistors; Voltage-controlled oscillators; CMOS technology; Voltage-controlled oscillator; transformer;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5
