LMS-based calibration of an RF digitally controlled oscillator for mobile phones

Author

Staszewski, Robert Bogdan ; Wallberg, John ; Hung, Chih-Ming ; Feygin, Gennady ; Entezari, Mitch ; Leipold, Dirk

Author_Institution

Wireless Analog Technol. Center, Texas Instrum. Inc., Dallas, TX, USA

Volume

53

Issue

3

fYear

2006

fDate

3/1/2006 12:00:00 AM

Firstpage

225

Lastpage

229

Abstract

We propose a least-mean square based gain calibration technique of an RF digitally controlled oscillator (DCO) in an all-digital phase-locked loop (ADPLL). The DCO gain of about 12-kHz/least significant bit is subject to process, voltage and temperature variations, but is tracked and compensated in real time. Precise setting of the inverse DCO gain in the ADPLL modulating path allows direct wide-band frequency modulation that is independent from the ADPLL loop bandwidth. The technique is part of a single-chip fully compliant Global System for Mobile Communications (GSM)/EDGE transceiver in 90-nm digital CMOS.

Keywords

calibration; cellular radio; digital control; frequency synthesizers; least mean squares methods; mobile handsets; phase locked loops; radiofrequency oscillators; 90 nm; ADPLL; DCO; EDGE transceiver; GSM; Global System for Mobile Communications; LMS-based calibration; RF digitally controlled oscillator; all-digital phase-locked loop; digital compensation; direct wide-band frequency modulation; frequency synthesizer; least-mean square; mobile phones; Calibration; Digital control; GSM; Mobile handsets; Oscillators; Phase locked loops; Radio frequency; Temperature; Voltage; Wideband; All digital; Global System for Mobile Communications (GSM); calibration; deep-submicrometer CMOS; digital compensation; digitally controlled oscillator (DCO); frequency synthesizer; mobile phones; modulator;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2005.858750

Filename

1605439