Title :
Wide tuning range LC VCO with parallel coupled negative gm cells
Author :
Jung, J. ; Upadyaya, P. ; Heo, Deukhyoun ; Kim, Jung-Ho ; Kim, Byung-Sung
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USA
Abstract :
To minimise phase noise degradation with a wide tuning range, the proposed LC voltage controlled oscillator incorporates parallel coupled negative transconductance (gm) cells. Phase noise for wide tuning range VCOs suffers from degradation of quality factor of tank inductors or tank capacitors due to their parasitic resistance. The proposed parallel coupled negative gm cells provide additional current to compensate for the loss of phase noise. The measured results show a tuning range of 25.4% and a phase noise of - 116.7 dBc/Hz at 1 MHz offset frequency at 5.87 GHz with power consumption of 1.4 mW. The figure-of-merit with the fractional tuning range of the VCO was - 199.9 dBc/Hz, which is the best among the latest state-of-the-art wide tuning range CMOS LC VCOs.
Keywords :
CMOS analogue integrated circuits; Q-factor; capacitors; inductors; microwave integrated circuits; microwave oscillators; voltage-controlled oscillators; figure-of-merit; fractional tuning range; frequency 1 MHz; frequency 5.87 GHz; parallel coupled negative transconductance cells; parasitic resistance; phase noise degradation minimisation; power 1.4 mW; quality factor; tank capacitors; tank inductors; voltage controlled oscillator; wide tuning range CMOS LC VCO;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.4508
