A 1 GHz /spl Sigma//spl Delta/ noise shaper for all digital PLLs with multiband UMTS modulation capability

Author

Mayer, Thomas ; Neubauer, Volker ; Vollenbruch, Ulrich ; Pittorino, Tindaro ; Maurer, Linus ; Springer, Andreas

Author_Institution

Inst. for Commun. & Inf. Eng., Johannes Kepler Univ., Linz

fYear

2006

fDate

11-13 June 2006

Abstract

Fully digital phase locked loops (PLLs) for wideband phase modulation set tough requirements on the digitally controlled oscillator (DCO). The frequency step size should be small while the linear tuning range should be very large. To find a solution for both requirements, oversampling at the DCO can be applied. This relaxes the requirements for the oscillator, but needs additional high speed circuitry for realization. This paper describes the detailed requirements of an oversampling circuit for UMTS modulation. A noise shaping method is proposed, which enables the realization of a UMTS compliant DCO design. Furthermore, the implementation of an 8 bit 2nd order SigmaDelta-modulator in 0.13 mum CMOS is shown

Keywords

3G mobile communication; CMOS integrated circuits; UHF integrated circuits; UHF oscillators; digital phase locked loops; phase modulation; sigma-delta modulation; 0.13 micron; 8 bit; CMOS process; SigmaDelta noise shaper; digital phase locked loops; digitally controlled oscillator; high speed integrated circuits; multiband UMTS modulation; wideband phase modulation; 3G mobile communication; Circuits; Delta modulation; Digital control; Digital modulation; Multi-stage noise shaping; Oscillators; Phase locked loops; Phase modulation; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits (RFIC) Symposium, 2006 IEEE

Conference_Location

San Francisco, CA

Print_ISBN

0-7803-9572-7

Type

conf

DOI

10.1109/RFIC.2006.1651189

Filename

1651189