| Summary: | 碩士 === 臺灣大學 === 電子工程學研究所 === 98 === 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
|
|---|
