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Low Phase Noise, 18 kHz Frequency Tuning Step, 5 GHz, 15 bit Digitally Controlled Oscillator in 0.18 µm CMOS Technology

Ramesh K. POKHAREL, Kenta UCHIDA, Abhishek TOMAR, Haruichi KANAYA, Keiji YOSHIDA

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Summary :

A method to realize the fine frequency-tuning steps using tiny capacitors instead of Metal-Insulator-Metal (MIM) capacitors is proposed for a digitally controlled oscillator (DCO). The tiny capacitors are realized by the coplanar transmission lines which are arranged unsymmetrical in a 6 metal layers (M6) foundry of 0.18 µm CMOS technology. These transmission line based capacitors are designed by using electro-magnetic field simulator, and co-designed by using SPICE simulator. Finally, these capacitors are employed to design 15 bit DCO and fabricated the proposed DCO in 0.18 µm CMOS technology, and tested. The measured phase noise of DCO was -118.3 dBc/Hz (@1 MHz offset frequency), and the oscillating frequency tuned from 4.86 GHz to 5.36 GHz in the minimum frequency-tuning step of 18 kHz.

Publication
IEICE TRANSACTIONS on Electronics Vol.E93-C No.7 pp.1007-1013
Publication Date
2010/07/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.E93.C.1007
Type of Manuscript
Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies)
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