A GMSK Modulator by Using a Fractional-N Frequency Synthesizer
Date Issued
2005
Date
2005
Author(s)
Tasi, Ming-Home
DOI
en-US
Abstract
In GSM communication system, the modulation of the modulated signals are GMSK. It is a kind of modulation way of continuiing phase, a kind of GFSK modulation way. In this work, we set up a complete behavior model of phase modulator in Simulink environment. In this chip, we use a sigma-delta fractional-N frequency synthesizer to implement partial RF circuit of the phase modulator. A phase frequency detector, a charge pump ,a multi-modulus divider and a voltage-controlled oscillator are fabricated with 0.35μm 2P4M CMOS technology and are operated over 1.8 GHz. The sigma-delta modulator is implemented by Simu-link and the pattern generator.
Subjects
頻率合成器
鎖相迴路
調變
PLL
Fractional-N
GMSK modulator
Type
thesis
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