Modeling of Non-linearity in Digitally Controlled Oscillator in 0.18 µm CMOS Technology

Abhishek TOMAR  Shashank LINGALA  Ramesh K. POKHAREL  Haruichi KANAYA  Keiji YOSHIDA  

IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.10   pp.1548-1549
Publication Date: 2010/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.1548
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
DCO,  DNL,  tuning range,  monotonicity,  phase noise,  0.18 µm CMOS,  

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An analytical method to make a trade off between tuning range and differential non-linearity (DNL) for a digitally controlled oscillator (DCO) is proposed. To verify the approach, a 12 bit DCO is designed, implemented in 0.18 µm CMOS technology, and tested. The measured DNL was -0.41 Least Significant Bit (LSB) without degrading other parameters which is the best so far among the reported DCOs.