Title :
Agile multi-band delta-sigma frequency synthesizer architecture
Author :
Bourdi, T. ; Borjak, A. ; Kale, I.
Author_Institution :
Dept. of Electron. Syst., Univ. of Westminster, London, UK
Abstract :
The emerging cellular and wireless standards necessitate the development of multi-mode transceiver systems. The main challenge in such systems is to have a common frequency synthesizer architecture acting as the local oscillator. In this paper, we propose a multi-band delta-sigma modulator based synthesizer architecture. This novel synthesizer architecture has been successfully implemented in an RF-CMOS process. The synthesized frequencies include the GSM, PCS and DCS bands.
Keywords :
CMOS integrated circuits; UHF integrated circuits; cellular radio; delta-sigma modulation; frequency synthesizers; mixed analogue-digital integrated circuits; phase locked loops; transceivers; DCS bands; GSM bands; PCS bands; RF CMOS process; delta-sigma frequency synthesizer architecture; delta-sigma modulator; local oscillator; multi-band frequency synthesizer architecture; multi-mode transceiver systems; noise shaped fractional-n PLL; Filters; Frequency conversion; Frequency synthesizers; Low-frequency noise; Multi-stage noise shaping; Noise figure; Noise generators; Noise shaping; Phase noise; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010728
