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

Fingerprint

Variable frequency oscillators
Transmitters
Modulation
Bluetooth
Phase locked loops
Transceivers
Thermal gradients
Temperature
Thermoanalysis

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

A 2.4-GHz temperature-compensated CMOS LC-VCO for low frequency drift low-power direct-modulation GFSK transmitters. / Tanzawa, Toru; Agawa, Kenichi; Shibayama, Hiroyuki; Terauchi, Ryota; Hisano, Katsumi; Ishikuro, Hiroki; Kousai, Shouhei; Kobayashi, Hiroyuki; Majima, Hideaki; Takayama, Toru; Koizumi, Masayuki; Hatori, Fumitoshi.

In: IEICE Transactions on Electronics, Vol. E88-C, No. 4, 04.2005, p. 490-495.

Research output: Contribution to journalArticle

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, vol. E88-C, no. 4, pp. 490-495. https://doi.org/10.1093/ietele/e88-c.4.490
Tanzawa, Toru ; Agawa, Kenichi ; Shibayama, Hiroyuki ; Terauchi, Ryota ; Hisano, Katsumi ; Ishikuro, Hiroki ; Kousai, Shouhei ; Kobayashi, Hiroyuki ; Majima, Hideaki ; Takayama, Toru ; Koizumi, Masayuki ; Hatori, Fumitoshi. / A 2.4-GHz temperature-compensated CMOS LC-VCO for low frequency drift low-power direct-modulation GFSK transmitters. In: IEICE Transactions on Electronics. 2005 ; Vol. E88-C, No. 4. pp. 490-495.
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