Title :
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
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;
Conference_Titel :
Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European
Conference_Location :
Estoril, Portugal
Print_ISBN :
0-7803-7995-0
DOI :
10.1109/ESSCIRC.2003.1257163
