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

1 Citation (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

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Keywords

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

ASJC Scopus subject areas

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

Cite this

Tanzawa, T., Agawa, K., Shibayama, H., Terauchi, R., Hisano, K., Ishikuro, H., Kousai, S., Kobayashi, H., Majima, H., Takayama, T., Koizumi, M., & Hatori, F. (2005). A 2.4-GHz temperature-compensated CMOS LC-VCO for low frequency drift low-power direct-modulation GFSK transmitters. IEICE Transactions on Electronics, E88-C(4), 490-495. https://doi.org/10.1093/ietele/e88-c.4.490