Title :
A 1.8 GHz CMOS fractional-N frequency synthesizer with randomized multi-phase VCO
Author :
Heng, Chun-Huat ; Song, Bang-Sup
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA
Abstract :
A synthesizer in 0.6 μm CMOS with an on-chip multiphase VCO exhibits no spurs resulting from interpolated phase errors. The proposed architecture randomizes phase errors of the multi-phase VCO to eliminate spurious tones generated by phase mismatch. Phase noise measured at 1.715 GHz is lower than -80 dBc within 20 kHz loop bandwidth and -118 dBc at 1 MHz offset with fractional spur below -70 dBc. The chip consumes 140 mW at 3.3 V and occupies 3.7 mm×4.6 mm.
Keywords :
CMOS integrated circuits; UHF integrated circuits; frequency synthesizers; phase noise; voltage-controlled oscillators; 0.6 micron; 1.8 GHz; 140 mW; 3.3 V; CMOS fractional-N frequency synthesizer; interpolated phase errors; on-chip multiphase VCO; phase mismatch; phase noise; randomized multi-phase VCO; spurious tones elimination; Clocks; Computer errors; Delta modulation; Frequency conversion; Frequency synthesizers; Interpolation; Phase detection; Phase modulation; Phase noise; Voltage-controlled oscillators;
Conference_Titel :
Custom Integrated Circuits Conference, 2002. Proceedings of the IEEE 2002
Print_ISBN :
0-7803-7250-6
DOI :
10.1109/CICC.2002.1012864
