<abstract xmlns="http://www.w3.org/1999/xhtml"><p>In this paper design and simulation of a 4.3 - 5.4 GHz LC digitally controlled oscillator (LC DCO) in IBM 7RF 0.18 μm CMOS technology are presented. Wide gigahertz tuning range is achieved by using two LC DCOs, sharing same structure. DCO is made of one NMOS negative impedance transistor pair and LC tank, which consists of high quality inductor and two switched capacitor arrays for coarse and fine frequency tuning. Coarse and fine tuning switched capacitor arrays are controlled using 6-bit and 3-bit binary words. To increase available frequency values, frequency divider is used. Structure of frequency divider is based on extended-true-single-phase-clock flip-flops. Divider is made of eight divide-by-2 cells connected in daisy chain, thus division values from 2 to 256 are available. Wide tuning range and high division values allows using such DCO with frequency divider in multi-standart transceivers. Whole device is supplied from a single 1.8 V voltage source. At highest frequency proposed device draws 90 mA current including all buffers. Phase noise is −116.4 dBc/Hz at 1 MHz offset from 5.44 GHz carrier. Designed dual DCO and frequency divider occupies about 0.4mm×0.5mm of chip space and whole chip, including pads, occupies 1.5mm × 1.5mm area of silicon.</p></abstract>

In this paper design and simulation of a 4.3 - 5.4 GHz LC digitally controlled oscillator (LC DCO) in IBM 7RF 0.18 μm CMOS technology are presented. Wide gigahertz tuning range is achieved by using two LC DCOs, sharing same structure. DCO is made of one NMOS negative impedance transistor pair and LC tank, which consists of high quality inductor and two switched capacitor arrays for coarse and fine frequency tuning. Coarse and fine tuning switched capacitor arrays are controlled using 6-bit and 3-bit binary words. To increase available frequency values, frequency divider is used. Structure of frequency divider is based on extended-true-single-phase-clock flip-flops. Divider is made of eight divide-by-2 cells connected in daisy chain, thus division values from 2 to 256 are available. Wide tuning range and high division values allows using such DCO with frequency divider in multi-standart transceivers. Whole device is supplied from a single 1.8 V voltage source. At highest frequency proposed device draws 90 mA current including all buffers. Phase noise is −116.4 dBc/Hz at 1 MHz offset from 5.44 GHz carrier. Designed dual DCO and frequency divider occupies about 0.4mm×0.5mm of chip space and whole chip, including pads, occupies 1.5mm × 1.5mm area of silicon.

Design of Gigahertz Tuning Range 5 GHz LC Digitally Controlled Oscillator in 0.18 μm CMOS

Departament of Computer Engineering, Vilnius Gediminas Technical University, Naugarduko st. 41-435, LT-03227 Vilnius, Lithuania

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

In this paper design and simulation of a 4.3 - 5.4 GHz LC digitally controlled oscillator (LC DCO) in IBM 7RF 0.18 μm CMOS technology are presented. Wide...

Design of Gigahertz Tuning Range 5 GHz LC Digitally Controlled Oscillator in 0.18 μm CMOS

Published Online: May 14, 2016

Page range: 143 - 148

Received: Sep 24, 2015

DOI: https://doi.org/10.1515/jee-2016-0020

Keywords
CMOS, integrated circuit, high frequency, digitally controlled oscillator, frequency divider, extended true-single-phase-clock

© Faculty of Electrical Engineering and Information Technology, Slovak University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Design of Gigahertz Tuning Range 5 GHz LC Digitally Controlled Oscillator in 0.18 μm CMOS

Published Online: May 14, 2016

Page range: 143 - 148

Received: Sep 24, 2015

DOI: https://doi.org/10.1515/jee-2016-0020

KeywordsCMOS, integrated circuit, high frequency, digitally controlled oscillator, frequency divider, extended true-single-phase-clock

© Faculty of Electrical Engineering and Information Technology, Slovak University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
CMOS, integrated circuit, high frequency, digitally controlled oscillator, frequency divider, extended true-single-phase-clock