Title :
Estimation and adaptive control of the DC component of impulse sensitivity functions in CMOS LC oscillators
Author :
Douglas, Dale S. ; Kenney, J. Stevenson
Author_Institution :
MetaLink Broadband RFIC Design Center, Norcross
Abstract :
A simple estimator for the DC component of the Hajimiri/Lee amplitude impulse sensitivity function (ISF or Lambda, the DC component is LambdaDC), suitable for the subset of waveforms in LC oscillators and amenable to CMOS implementation, is theoretically developed and verified via simulation. A mixed-signal system is developed which uses the LambdaDC estimate to adjust an oscillator core to maintain the condition of minimum flicker noise upconversion. Finally, a figure of merit (FOM) methodology suitable to both the 20- and 30-dB-per-decade phase noise regions is developed to quantify the effectiveness of the approach. A fixed calibration constant across N is sufficient to allow convergence to within 0.7 dB of optimal FOM1 in all cases.
Keywords :
CMOS integrated circuits; adaptive control; flicker noise; mixed analogue-digital integrated circuits; phase noise; voltage-controlled oscillators; CMOS LC oscillators; CMOS implementation; DC component; FOM methodology; adaptive control; figure of merit methodology; flicker noise upconversion; impulse sensitivity functions; mixed-signal system; phase noise regions; 1f noise; Adaptive control; CMOS technology; Design engineering; Phase noise; Radiofrequency integrated circuits; Ring oscillators; Testing; Time domain analysis; Voltage-controlled oscillators; Adaptive systems; mixed analog-digital integrated circuits; oscillators; phase noise; voltage controlled oscillators;
Conference_Titel :
Radio and Wireless Symposium, 2008 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4244-1462-8
Electronic_ISBN :
978-1-4244-1463-5
DOI :
10.1109/RWS.2008.4463507
