A 0.35/spl mu/ CMOS fractional-N transmitter for 315/433/868/915 MHz ISM applications

Author

Jacobs, P. ; Janssens, J. ; Geurts, T. ; Crols, J.

Author_Institution

Ansem N.V., Heverlee, Belgium

fYear

2003

fDate

16-18 Sept. 2003

Firstpage

425

Lastpage

428

Abstract

A CMOS fractional-N transmitter offers up to 115.2 kbits/s 2-FSK communications in the 315,433,868 and 915 MHz ISM bands. Transmission is done using direct digital modulation of a fully integrated /spl Delta//spl Sigma/ fractional-N PLL frequency synthesizer. The high PLL bandwidth ensures a low-close-in phase noise, enabling narrowband transmission with low adjacent channel power. The 5.4 mm/sup 2/ IC is integrated in a 0.35/spl mu/m CMOS technology and consumes 14mA at 2.7V.

Keywords

CMOS integrated circuits; delta-sigma modulation; frequency synthesizers; phase locked loops; phase noise; power amplifiers; CMOS fractional-N transmitter; CMOS technology; ISM applications; ISM bands; PLL bandwidth; adjacent channel power; direct digital modulation; frequency synthesizer; integrated /spl Delta//spl Sigma/; low-close-in phase noise; narrowband transmission; Bandwidth; Digital modulation; Frequency shift keying; Frequency synthesizers; Inductors; Phase locked loops; Phase noise; Transmitters; Tuning; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European

Conference_Location

Estoril, Portugal

Print_ISBN

0-7803-7995-0

Type

conf

DOI

10.1109/ESSCIRC.2003.1257163

Filename

1257163