A 2.4-GHz temperature-compensated CMOS LC-VCO for low frequency drift low-power direct-modulation GFSK transmitters

Toru Tanzawa, Kenichi Agawa, Hiroyuki Shibayama, Ryota Terauchi, Katsumi Hisano, Hiroki Ishikuro, Shouhei Kousai, Hiroyuki Kobayashi, Hideaki Majima, Toru Takayama, Masayuki Koizumi, Fumitoshi Hatori

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A frequency drift of open-loop PLL is an issue for the direct-modulation applications such as Bluetooth transceiver. The drift mainly comes from a temperature variation of VCO during the transmission operation. In this paper, we propose the optimum location of the VCO, considering the temperature gradient through the whole-chip thermal analysis. Moreover, a novel temperature- compensated VCO, employing a new biasing scheme, is proposed. The combination of these two techniques enables the power reduction of the transmitter by 33% without sacrificing the performance.

Original languageEnglish
Pages (from-to)490-495
Number of pages6
JournalIEICE Transactions on Electronics
VolumeE88-C
Issue number4
DOIs
Publication statusPublished - 2005 Apr
Externally publishedYes

Keywords

  • Bluetooth
  • CMOS LC-VCO
  • Direct modulation
  • GFSK
  • Low power

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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