Title :
A 4GHz Fractional-N synthesizer for IEEE 802.11a
Author :
Chien, Hung-Ming ; Tsung-Hsien Lin ; Ibrahim, Brima ; Zhang, Lijun ; Rofougaran, Maryam ; Rofougaran, Ahmadreza ; Kaiser, William J.
Abstract :
Phase noise of the Fractional-N synthesizer depends critically on the linearity of its building blocks. In this research, new design methods are shown to directly improve its linearity. This includes a new re-timing scheme that effectively reduces phase noise for multi-modulus dividers. Further reductions in phase noise result from introduction of a high linearity CMOS charge pump. Measurement results verify the concept and demonstrate low phase noise performance at 4GHz.
Keywords :
CMOS integrated circuits; OFDM modulation; phase noise; voltage-controlled oscillators; 4 GHz; 4GHz Fractional-N synthesizer; IEEE 802.11a; building blocks; high linearity CMOS charge pump; multi-modulus dividers; phase noise; re-timing scheme; Charge pumps; Circuit optimization; Degradation; Error correction; Frequency synthesizers; Linearity; OFDM; Phase frequency detector; Phase noise; Tuning;
Conference_Titel :
VLSI Circuits, 2004. Digest of Technical Papers. 2004 Symposium on
Print_ISBN :
0-7803-8287-0
DOI :
10.1109/VLSIC.2004.1346498
