An Ultra Compact Differentially Tuned 6 GHz CMOS LC VCO with Dynamic Common-Mode Feedback

Author

Soltanian, Babak ; Ainspan, Herschel ; Rhee, Woogeun ; Friedman, Daniel ; Kinget, Peter

Author_Institution

Columbia Univ., New York, NY

fYear

2006

Firstpage

671

Lastpage

674

Abstract

A fully integrated 0.024mm² differentially tuned 6GHz LC VCO for 6+Gbps high speed serial (HSS) links in a 90nm bulk CMOS is presented. It is smaller than any LC-VCO reported to date at this frequency. Its size is comparable with ring oscillators but it has significantly better phase noise. A circuit technique is introduced to dynamically set the common-mode (CM) voltage of the differential varactor control signals equal to the VCO´s CM. Using a differential control a very wide tuning range from 4.5GHz to 7.1GHz (45%) is achieved. The VCO has a measured phase noise of -117.7dBc/Hz at a 3MHz offset from a 5.63GHz carrier while dissipating 14mW from a 1.6V supply

Keywords

CMOS analogue integrated circuits; circuit tuning; feedback; microwave oscillators; varactors; voltage-controlled oscillators; 1.6 V; 14 mW; 4.5 to 7.1 GHz; 90 nm; CMOS LC VCO; common-mode voltage; differential varactor control; differentially tuned VCO; dynamic common-mode feedback; high speed serial links; voltage controlled oscillator; Circuit optimization; Feedback; Frequency; Noise measurement; Phase measurement; Phase noise; Ring oscillators; Varactors; Voltage control; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference, 2006. CICC '06. IEEE

Conference_Location

San Jose, CA

Print_ISBN

1-4244-0075-9

Electronic_ISBN

1-4244-0076-7

Type

conf

DOI

10.1109/CICC.2006.320877

Filename

4115046