Systematic Analysis of Quadrature VCO with Capacitive Source Degeneration Coupling and Spontaneous Transconductance Matching Techniques

Shuenn-Yuh Lee, Chun Jung Chiu, Hao Yun Lee

Research output: Contribution to journalArticle

Abstract

This brief proposes a quadrature voltage-controlled oscillator (QVCO) using capacitive source degeneration coupling (CSDC) and spontaneous transconductance matching (STM) techniques. Mismatch in QVCO structure results in serious phase and gain errors. Thus, a CSDC structure is used to overcome phase error, and an STM structure is adopted to reduce gain error. Moreover, a systematic analysis of QVCO on the proposed techniques is presented to design a remarkable phase error of less than 0.1°. Measurement results reveal that the proposed QVCO has a phase error of 0.07° at 2.45 GHz. The measured phase noise is-121 dBc/Hz at 1 MHz offset and consumes 3.81 mW under a 1.8V supply voltage, which achieve a figure of merit of-182.98. The tuning range should be between 2.303 GHz and 2.475 GHz to fit the requirement of IEEE 802.15.4.

Original languageEnglish
Article number8424026
Pages (from-to)517-521
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume66
Issue number4
DOIs
Publication statusPublished - 2019 Apr 1

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Variable frequency oscillators
Transconductance
Phase noise
Tuning
Electric potential

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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title = "Systematic Analysis of Quadrature VCO with Capacitive Source Degeneration Coupling and Spontaneous Transconductance Matching Techniques",
abstract = "This brief proposes a quadrature voltage-controlled oscillator (QVCO) using capacitive source degeneration coupling (CSDC) and spontaneous transconductance matching (STM) techniques. Mismatch in QVCO structure results in serious phase and gain errors. Thus, a CSDC structure is used to overcome phase error, and an STM structure is adopted to reduce gain error. Moreover, a systematic analysis of QVCO on the proposed techniques is presented to design a remarkable phase error of less than 0.1°. Measurement results reveal that the proposed QVCO has a phase error of 0.07° at 2.45 GHz. The measured phase noise is-121 dBc/Hz at 1 MHz offset and consumes 3.81 mW under a 1.8V supply voltage, which achieve a figure of merit of-182.98. The tuning range should be between 2.303 GHz and 2.475 GHz to fit the requirement of IEEE 802.15.4.",
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Systematic Analysis of Quadrature VCO with Capacitive Source Degeneration Coupling and Spontaneous Transconductance Matching Techniques. / Lee, Shuenn-Yuh; Chiu, Chun Jung; Lee, Hao Yun.

In: IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 66, No. 4, 8424026, 01.04.2019, p. 517-521.

Research output: Contribution to journalArticle

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