Title :
A wide-range frequency synthesizer using a compensated phase-rotating technique for digital TV tuners
Author :
Yang, Ching-Yuan ; Wu, Hsin-Ming ; Weng, Jun-Hong ; Wu, Ping-Heng
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Hsing Univ., Taichung, Taiwan
Abstract :
Fabricated in a 0.18-¿m CMOS technology, a wide-range fractional-N frequency synthesizer with a phase-compensated technique is presented. While using a 630-960 MHz LC-type VCO, the synthesizer can provide the range of 55 to 960 MHz with a band-selecting structure to satisfy the ATSC applications. Using the phase-rotating concept, the synthesizer can achieve the fractional functionality, instead of the conventional ¿¿ interpolation. The measured results show phase noise is -123 dBc/Hz at 1-MHz offset. The lock time is below 6 ¿s from 640 MHz to 930 MHz.
Keywords :
CMOS integrated circuits; digital television; frequency synthesizers; tuning; voltage-controlled oscillators; CMOS technology; digital TV tuner; fractional-N frequency synthesizer; frequency 55 MHz to 960 MHz; frequency 630 MHz to 960 MHz; frequency 640 MHz to 930 MHz; phase-compensated technique; phase-rotating technique; size 0.18 micron; CMOS technology; Digital TV; Frequency conversion; Frequency synthesizers; Phase frequency detector; Phase locked loops; Phase noise; Space technology; Tuners; Voltage-controlled oscillators;
Conference_Titel :
Intelligent Signal Processing and Communication Systems, 2009. ISPACS 2009. International Symposium on
Conference_Location :
Kanazawa
Print_ISBN :
978-1-4244-5015-2
Electronic_ISBN :
978-1-4244-5016-9
DOI :
10.1109/ISPACS.2009.5383817
