Title :
Wide tunable CMOS multiple-nested-feedback ring type L-C oscillator
Author :
Hwang, J.T. ; Woo, S.H. ; Hwang, M.W. ; Cho, G.-H.
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea
fDate :
1/21/1999 12:00:00 AM
Abstract :
A new CMOS multiple-nested-feedback ring type L-C oscillator (MFLCO) is presented. The new oscillator shows a wide tuning range and fast speed at low voltage operation. The phase noise is expected to be approximately that of a monolithic L-C oscillator. For three and four-stage MFLCOs, 200 MHz and 520 MHz tuning ranges are achieved without varactor diodes, respectively. The maximum speed exceeds 3 GHz, which reaches approximately fT/3 with 0.8 μm CMOS technology. The proposed oscillators are suitable for RF frequency synthesisers and multiphase applications
Keywords :
CMOS analogue integrated circuits; circuit tuning; feedback oscillators; high-speed integrated circuits; low-power electronics; voltage-controlled oscillators; 0.8 micron; 3 GHz; CMOS multiple-nested-feedback ring-type LC oscillator; RF frequency synthesiser; low-voltage high-speed monolithic circuit; phase noise; tuning range;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19990100
