A fully integrated, automatically adjusted CMOS RF modulator for cellular applications

Author

Mayer, Thomas ; Neurauter, Burkhard ; Springer, Andreas

Author_Institution

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

fYear

2006

Firstpage

567

Lastpage

570

Abstract

This paper describes a fully integrated RF phase modulator based on a type I fractional-N phase locked loop (PLL). A digital preemphasis filter is used to extend the transfer bandwidth beyond the narrow loop bandwidth. All critical process dependent components like VCO, loop filter and charge pump are controlled and aligned fully digital to provide the necessary accuracy needed for wideband phase modulation. The VCO operates at 4 GHz, with a phase noise of -165 dBc/Hz at 20 MHz offset from the carrier. The phase modulator was implemented in a single chip GSM/GPRS transceiver as well as in a single chip GSM/EDGE polar modulator transceiver.

Keywords

CMOS integrated circuits; cellular radio; digital filters; microwave filters; modulators; packet radio networks; phase locked loops; phase modulation; transceivers; voltage-controlled oscillators; 20 MHz; 4 GHz; CMOS RF phase modulator; GPRS transceiver; GSM transceiver; PLL; VCO; cellular applications; charge pump; digital preemphasis filter; fractional-N phase locked loop; loop filter; narrow loop bandwidth; phase noise; polar modulator transceiver; process dependent components; transfer bandwidth; wideband phase modulation; Bandwidth; Charge pumps; Digital filters; GSM; Phase locked loops; Phase modulation; Radio frequency; Transceivers; Voltage-controlled oscillators; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Symposium, 2006 IEEE

Print_ISBN

0-7803-9412-7

Type

conf

DOI

10.1109/RWS.2006.1615220

Filename

1615220