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Titolo:
A GMSK modulator, using a Delta Sigma frequency discriminator-based synthesizer
Autore:
Bax, WT; Copeland, MA;
Indirizzi:
SiGe Semicond, Ottawa, ON K2B 8J9, Canada SiGe Semicond Ottawa ON Canada K2B 8J9 micond, Ottawa, ON K2B 8J9, Canada Carleton Univ, Dept Elect, Ottawa, ON K1S 5B6, Canada Carleton Univ Ottawa ON Canada K1S 5B6 Elect, Ottawa, ON K1S 5B6, Canada
Titolo Testata:
IEEE JOURNAL OF SOLID-STATE CIRCUITS
fascicolo: 8, volume: 36, anno: 2001,
pagine: 1218 - 1227
SICI:
0018-9200(200108)36:8<1218:AGMUAD>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Keywords:
continuous-phase modulation; delta-sigma; digital radio; frequency discriminator; frequency modulation; GMSK; GSM; phase-locked loop; synthesizer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Bax, WT SiGe Semicond, Ottawa, ON K2B 8J9, Canada SiGe Semicond Ottawa ONCanada K2B 8J9 Ottawa, ON K2B 8J9, Canada
Citazione:
W.T. Bax e M.A. Copeland, "A GMSK modulator, using a Delta Sigma frequency discriminator-based synthesizer", IEEE J SOLI, 36(8), 2001, pp. 1218-1227

Abstract

This paper describes a new transmitter architecture suitable for wide-bandGMSK modulation. The technique uses direct modulation of a Delta Sigma frequency discriminator (Delta Sigma FD)-based synthesizer to produce the modulated RF signal without any up-conversion. Digital equalization is used to extend the modulation data rate far beyond the synthesizer closed-loop BW. A prototype 1.9-GHz GSM transmitter was constructed consisting of a Delta Sigma FD-based synthesizer and a digital transmit filter. The synthesizer consists of an 0.8-mum BiCMOS Delta Sigma FD chip, a digital signal processorFPGA, and an off-chip D/A converter, filter, and VCO. Measured results, using 271-kbit/s GSM modulation, demonstrate data rates well in excess of the30-kHz synthesizer closed-loop BW are possible with digital equalization. Without modulation, the synthesizer exhibits a -76-dBc spurious noise leveland a close-in phase noise of -74 dBc/Hz.

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Documento generato il 09/04/20 alle ore 07:33:37