Subharmonic direct frequency synthesizer for mode-1 MB-OFDM UWB system
- Resource Type
- Conference
- Authors
- Chien-chih Lin; Chorng-Kuang Wang
- Source
- Digest of Technical Papers. 2005 Symposium on VLSI Circuits, 2005. VLSI Circuits VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on. :38-41 2005
- Subject
- Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Frequency synthesizers
Amplitude modulation
Interference
CMOS technology
Phase locked loops
Signal synthesis
Circuit synthesis
Contamination
Voltage-controlled oscillators
Voltage
- Language
- ISSN
- 2158-5601
2158-5636
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.