A 1-V 2.4-GHz low-power fractional-N frequency synthesizer with sigma-delta modulator controller

Shuenn-Yuh Lee, Chung Han Cheng, Ming Feng Huang, Shyh Chyang Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A 1-V low-power 2.4GHz fractional-N frequency synthesizer with sigma-delta modulator controller for Bluetooth applications is implemented in 0.18 μm CMOS technology. A novel structure dual-modulus divide-by-128/129 prescaler using dynamic D-flip-flop is proposed and the operating clock frequency can reach as high as 2.6 GHz at 1-V supply voltage. Moreover, a third-order feedforward sigmadelta modulator (SDM) is employed as a modulus controller to achieve an appropriate division ratio and suppress the fractional spurs. The simulation results show the synthesizer possesses the tuning range of 2.136 to 2.53 GHz and a phase noise of -126.85 dBc/Hz at 1MHz offset. Moreover, the core area without the SDM and the loop filter is 0.85 mm2, and the total power consumption is 8.94 mW.

Original languageEnglish
Article number1465211
Pages (from-to)2811-2814
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
DOIs
Publication statusPublished - 2005

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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