Title :
A fully integrated PLL frequency synthesizer LSI for mobile communication system
Author :
Yasunaga, T. ; Hirano, S. ; Maeda, R. ; Hiraoka, Y. ; Andou, T. ; Miyahara, Y.
Author_Institution :
Div. of Corp. Eng., Matsushita Commun. Ind. Co. Ltd., Yokohama, Japan
Abstract :
A fully integrated phase locked loop (PLL) frequency synthesizer LSI has been developed. This newly developed fractional-N type PLL LSI consists of an on-chip loop filter and a voltage controlled oscillator (VCO) with an on-chip resonator circuit. This VCO has a band-switching tuning circuit using MOS capacitors and an analog tuning circuit using PN varactor diodes. Both these tuning circuits are controlled automatically without external adjustment. The phase noise of the VCO at 2.2 GHz is -92.5 dBc/Hz at 50 kHz offset, while the frequency switching time is 170 /spl mu/s.
Keywords :
MMIC oscillators; UHF integrated circuits; UHF oscillators; circuit tuning; frequency synthesizers; land mobile radio; large scale integration; phase locked loops; phase noise; varactors; voltage-controlled oscillators; 170 mus; 2.2 GHz; MOS capacitors; PLL frequency synthesizer LSI; PN varactor diodes; analog tuning circuit; band-switching tuning circuit; fractional-N type PLL; frequency switching time; mobile communication system; on-chip loop filter; on-chip resonator circuit; phase noise; tuning circuits; voltage controlled oscillator; Automatic control; Circuit optimization; Diodes; Frequency synthesizers; Large scale integration; MOS capacitors; Phase locked loops; Resonator filters; Varactors; Voltage-controlled oscillators;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2001. Digest of Papers. 2001 IEEE
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6601-8
DOI :
10.1109/RFIC.2001.935643
