Frequency Resolution Enhancement for Digitally-Controlled Oscillator Based on a Single-Period Switching Scheme

Kazutoshi KODAMA; Tetsuya IIZUKA; Toru NAKURA; Kunihiro ASADA

doi:10.1587/transele.E95.C.1857

Regular Section

Frequency Resolution Enhancement for Digitally-Controlled Oscillator Based on a Single-Period Switching Scheme

Kazutoshi KODAMA, Tetsuya IIZUKA, Toru NAKURA, Kunihiro ASADA

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Keywords: DCO, ADPLL, high frequency resolution enhancement

JOURNAL RESTRICTED ACCESS

2012 Volume E95.C Issue 12 Pages 1857-1863

DOI https://doi.org/10.1587/transele.E95.C.1857

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Abstract

This paper proposes a high frequency resolution Digitally-Controlled Oscillator (DCO) using a single-period control bit switching scheme. The proposed scheme controls the tuning word of DCO in a single period for the fine frequency tuning. The LC type DCO is implemented to realize the proposed scheme, and is fabricated using a standard 65nm CMOS technology. The measurement results show that the implemented DCO improves the frequency resolution from 560kHz to 180kHz without phase noise degradation with an additional area of 200µm².

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