8-GHz CMOS quadrature VCO using transformer-based LC tank

Donghyun Baek, Taeksang Song, Euisik Yoon, Songcheol Hong

Research output: Contribution to journalLetter

68 Citations (Scopus)

Abstract

A fully integrated quadrature VCO at 8 GHz is presented. The VCO is implemented using a transformer-based LC tank in 0.18 μm CMOS technology, in which two VCOs are coupled to generate I-Q signals. The VCO is realized employing the drain-gate transformer feedback configuration proposed here. This makes use of the quality factor enhancement in the resonator using a transformer and the deep switching-off technique by controlling gate bias. By turning off switching transistors of the differential VCO core deeply, the phase noise performance is improved more than 10 dB. The measured phase noise values are -110 and -117 dBc/HZ at the offset frequencies of 600 kHz and 1 MHz respectively. The tuning range of 250 MHz is achieved with the control voltage from 0 to 1 V. The VCO draws 8 mA in two differential core circuits from 3 V supply. When the bias voltage goes down to 2.5 V, the phase noise decrease only 2 dB compared to that of 3 V bias. The VCO performances are compared with previously reported quadrature Si VCOs in 5 ∼ 12 GHz frequency range.

Original languageEnglish
Pages (from-to)446-448
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume13
Issue number10
DOIs
Publication statusPublished - 2003 Oct 1

Fingerprint

voltage controlled oscillators
Variable frequency oscillators
quadratures
transformers
CMOS
Phase noise
electric potential
Bias voltage
Voltage control
Q factors
Resonators
Transistors
transistors
Tuning
frequency ranges
resonators
tuning
Feedback
Networks (circuits)
augmentation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Baek, Donghyun ; Song, Taeksang ; Yoon, Euisik ; Hong, Songcheol. / 8-GHz CMOS quadrature VCO using transformer-based LC tank. In: IEEE Microwave and Wireless Components Letters. 2003 ; Vol. 13, No. 10. pp. 446-448.
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8-GHz CMOS quadrature VCO using transformer-based LC tank. / Baek, Donghyun; Song, Taeksang; Yoon, Euisik; Hong, Songcheol.

In: IEEE Microwave and Wireless Components Letters, Vol. 13, No. 10, 01.10.2003, p. 446-448.

Research output: Contribution to journalLetter

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AU - Hong, Songcheol

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