Title :
A fully integrated CMOS DCS-1800 frequency synthesizer
Author :
Craninckx, J. ; Steyaert, M.
Author_Institution :
Katholieke Univ., Leuven, Heverlee, Belgium
Abstract :
This design integrates a 4/sup th/ order type-2 charge-pump PLL frequency synthesizer for the DCS-1800 system in a standard 0.4 /spl mu/m CMOS process without external components. The VCO uses an integrated hollow planar inductor, formed in the 2 metal levels available on a lowly-doped substrate. The coil has a symmetrical octagonal shape and size optimized using 2-D circular finite-element analysis. Skin effect and eddy current losses are minimized, and the quality factor is 8.6. VCO phase noise is -122.5 dBc/Hz at 600 kHz offset and tuning range is 20%.
Keywords :
CMOS analogue integrated circuits; finite element analysis; frequency synthesizers; phase locked loops; voltage-controlled oscillators; 0.4 micron; 2D circular finite element analysis; CMOS integrated circuit; DCS-1800 system; VCO; coil; eddy current loss; fourth order type-2 charge-pump PLL frequency synthesizer; phase noise; planar inductor; quality factor; skin effect; tuning range; CMOS process; Charge pumps; Coils; Finite element methods; Frequency synthesizers; Inductors; Phase locked loops; Shape; Skin effect; Voltage-controlled oscillators;
Conference_Titel :
Solid-State Circuits Conference, 1998. Digest of Technical Papers. 1998 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-4344-1
DOI :
10.1109/ISSCC.1998.672539
