Subharmonic direct frequency synthesizer for mode-1 MB-OFDM UWB system
Resource
VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on
Journal
VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on
Pages
-
Date Issued
2005-06
Date
2005-06
Author(s)
Lin, Chien-Chih
Wang, Chorng-Kuang
DOI
N/A
Abstract
This paper proposes a subharmonic direct frequency synthesizer (SH-DFS) for the hopping carrier generation in mode-1 MB-OFDM based UWB system. The SH-DFS employs octet phases of 2.244-GHz from a VCO to synthesize and the deviations at 528-MHz and 1.056-GHz acquired from a divide-by-17 semi-dynamic divider. The output stage with the switched functionalities between a subharmonic single sideband (SH-SSB) mixer and an edge combiner generates the designated tone. Realized in 0.18-/spl mu/m CMOS technology, it occupies an active area of 1 /spl times/ 1 mm/sup 2/. The chip draws 34-mW power from a single supply at 1.8-V. The carrier output has the voltage swing larger than 700-mV/sub pp/ and the spurious tones are smaller than -20-dBc.
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Type
journal article
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