The Design and Application of CMOS PLL-Based Frequency Synthesizers
Date Issued
2010
Date
2010
Author(s)
Chang, Yuen-Tai
Abstract
In this thesis, we roughly divide two part, part one is a 10/5/2.4 GHz fractional-N frequency synthesizer with auto frequency calibration, part two is a 2.4GHz GFSK transmitter base on a fractional-N frequency synthesizer.
In part one, a 10/5/2.4 GHz multiband frequency synthesizer with auto frequency calibration (AFC). To achieve the application of 10/5/2.4 GHz communication system, the first band is directly output of VCO then through a super-dynamic divider output is the second band and then through a current mode logic divider output is the third band.
In part two, a GFSK transmitter have been designed and realized base on a 2.4GHz frequency synthesizer. this GFSK transmitter using a 8-bit delta-sigma modulator, Gaussian filter and a close loop phase lock loop. It has good phase noise, easy to implement due to the architecture of close loop and no mixer required.
Keywords: PLL, delta-sigma modulator, ∆∑fractional-N frequency synthesizer, GFSK, transmitter, 2.4GHz
In part one, a 10/5/2.4 GHz multiband frequency synthesizer with auto frequency calibration (AFC). To achieve the application of 10/5/2.4 GHz communication system, the first band is directly output of VCO then through a super-dynamic divider output is the second band and then through a current mode logic divider output is the third band.
In part two, a GFSK transmitter have been designed and realized base on a 2.4GHz frequency synthesizer. this GFSK transmitter using a 8-bit delta-sigma modulator, Gaussian filter and a close loop phase lock loop. It has good phase noise, easy to implement due to the architecture of close loop and no mixer required.
Keywords: PLL, delta-sigma modulator, ∆∑fractional-N frequency synthesizer, GFSK, transmitter, 2.4GHz
Subjects
PLL
delta-sigma modulator
??fractional-N frequency synthesizer
GFSK
transmitter
Type
thesis
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