Title :
A 0.8-V 4.9-mW CMOS Fractional-N Frequency Synthesizer for RFID Application
Author :
Wang, Wenting ; Luong, Howard C.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon
Abstract :
A 0.8-V fractional-N frequency synthesizer is described, which employs an improved transformer-feedback VCO and a 2-bit third-order SigmaDelta modulator. Implemented in a 0.18-mum CMOS technology, the synthesizer is operated with a 0.8 V supply while consuming 4.92 mW. Phase-noise of -104dBc/Hz at 200-kHz offset and -121dBc/Hz at 1-MHz offset with a reference spur of -84dBc is measured at a center frequency of 1.17 GHz. The synthesizer has a frequency tuning range from 1.06 GHz to 1.4 GHz with a resolution of 25 kHz
Keywords :
CMOS integrated circuits; frequency synthesizers; phase noise; radiofrequency identification; sigma-delta modulation; voltage-controlled oscillators; 0.18 micron; 0.8 V; 1.06 to 1.4 GHz; 1.17 GHz; 2 bit; 4.9 mW; CMOS technology; RFID application; fractional-N frequency synthesizer; frequency tuning range; phase noise; third-order SigmaDelta modulator; transformer-feedback VCO; CMOS technology; Channel spacing; Filters; Frequency conversion; Frequency measurement; Frequency synthesizers; Phase noise; Radiofrequency identification; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Solid-State Circuits Conference, 2006. ESSCIRC 2006. Proceedings of the 32nd European
Conference_Location :
Montreux
Print_ISBN :
1-4244-0303-0
DOI :
10.1109/ESSCIR.2006.307552
