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A 2.4GHz Frequency Synthesizer in 0.6mm CMOS
by
Alexandre Rudolf Kral
Master of Science in Electrical Engineering
University of California, Los Angeles, 1998
Professor Asad A. Abidi, Chair
ABSTRACT OF THE THESIS
A 2.4GHz Frequency Synthesizer is designed for use in an all CMOS,
2.4GHz, fully adaptive, frequency hopped transceiver. The synthesizer consists in
a phase-locked loop that controls an LC tank VCO tuned at 2.17GHz. Special
emphasis has been set on the design of the VCO and its LC tank. Many different
VCO’s have been designed and tested. The VCO phase noise is directly connected
to the quality factor of the LC resonant circuit, which is mainly determined by the
on-chip inductor in this technology. Many types of inductors have been designed
and measured. The analysis leads to general guidelines on how to build good-Q
inductors. Several sorts varactors have also been fabricated, measured and
analyzed.
The quadrature signals for use in a single sideband modulator (SSB) are
created by an on-chip polyphase filter and then mixed with a hopping signal to
reach the desired frequency of 2.4GHz. The building blocks of this work are
fabricated in a 0.6mm standard CMOS process.
Measured phase noise results are -104dBc/Hz at an offset of 100kHz from
a carrier at 1.53GHz, dissipating 7mA under a 2V power supply and -104dBc/Hz
at an offset of 100kHz from a carrier at 2.0GHz, dissipating 8mA under a 3.3V
power supply. |
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发表于 2006-11-28 09:08:32
