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

fYear

2008

fDate

22-24 Jan. 2008

Firstpage

375

Lastpage

378

Abstract

A simple estimator for the DC component of the Hajimiri/Lee amplitude impulse sensitivity function (ISF or Lambda, the DC component is Lambda_DC), 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 Lambda_DC 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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/RWS.2008.4463507

Filename

4463507